Unit b matter and chemical change notes(physical & chemical changes)
•Download as PPTX, PDF•
1 like•668 views
Physical changes alter a substance's state but not its chemical composition, allowing separation back into original substances like melting ice cream. Chemical changes form new substances that are different from reactants, identified by a change in color, odor, formation of solids or gases, or release of energy like light and heat. Physical and chemical changes are distinguished by whether the original substances can be recovered after the change.
Report
Share
Report
Share
Recommended
Physical & chemical changes oh my
Here are the answers:
1) Cutting Grass - Physical
2) Burning Toast - Chemical
3) Wadding up Homework - Physical
4) Ice Cream Melting - Physical
5) Frying an Egg - Chemical
6) Gasoline Combustion - Chemical
7) Sweat Evaporating - Physical
Physical and chemical changes
Physical and Chemical changes, Class 7th ncert based, Elements and compounds, properties of compounds,chemical reaction,crystallisation
Physical and chemical changes
Changes in matter are classified into physical and chemical changes.Physical Changes are those in which the identifying properties of substances remain unchanged. Chemical Changes are those in which new substances with new properties are formed.
chemical changes NCERT CLASS 7 CHAPTER 6
This document discusses physical and chemical changes, using the burning of magnesium ribbon as an example of a chemical change. It notes that a chemical change results in a new substance being formed, is irreversible, and can produce heat, light, gases or smells. When magnesium ribbon burns in oxygen, it forms magnesium oxide, a white ash, demonstrating that a new substance is created in a chemical reaction.
Physical and chemical changes
This document discusses physical and chemical changes. It defines physical changes as changes in a substance's appearance or state without producing a new substance. Chemical changes produce new substances through chemical reactions. Examples of each type of change are provided, along with activities and demonstrations to illustrate the differences between physical and chemical changes. Key terms related to changes in matter are also defined.
Chemical and Physical Changes
A physical change alters a substance's physical properties like shape, size, or state, but does not create new substances. A chemical change produces new substances through chemical reactions, altering both physical and chemical properties. Some key differences are that physical changes are typically reversible without new substances forming, while chemical changes are permanent reactions that form new substances through energy absorption or release. Rusting of iron is a chemical change that occurs when iron reacts with oxygen and water in the air, forming hydrated iron oxide (rust) which damages the iron over time.
Physical Or Chemical Change Qz
Physical changes are changes that do not result in a new substance and can sometimes be reversed, such as melting, freezing, breaking, and cutting. Chemical changes result in new substances through chemical reactions, such as burning, digestion, and rusting, and cannot be reversed. The document provides examples of both physical and chemical changes and discusses their distinguishing properties.
Physical and Chemical Changes
Physical changes involve a change in a substance's physical properties but no new substance is formed. Chemical changes result in a new substance being formed through a chemical reaction. Some examples of physical changes include folding paper, melting wax, and freezing water. Chemical changes include burning paper, the reaction of vinegar and baking soda, and rusting of iron. A key difference is that physical changes are typically reversible while chemical changes produce new substances that cannot be reversed back to the original.
Recommended
Physical & chemical changes oh my
Here are the answers:
1) Cutting Grass - Physical
2) Burning Toast - Chemical
3) Wadding up Homework - Physical
4) Ice Cream Melting - Physical
5) Frying an Egg - Chemical
6) Gasoline Combustion - Chemical
7) Sweat Evaporating - Physical
Physical and chemical changes
Physical and Chemical changes, Class 7th ncert based, Elements and compounds, properties of compounds,chemical reaction,crystallisation
Physical and chemical changes
Changes in matter are classified into physical and chemical changes.Physical Changes are those in which the identifying properties of substances remain unchanged. Chemical Changes are those in which new substances with new properties are formed.
chemical changes NCERT CLASS 7 CHAPTER 6
This document discusses physical and chemical changes, using the burning of magnesium ribbon as an example of a chemical change. It notes that a chemical change results in a new substance being formed, is irreversible, and can produce heat, light, gases or smells. When magnesium ribbon burns in oxygen, it forms magnesium oxide, a white ash, demonstrating that a new substance is created in a chemical reaction.
Physical and chemical changes
This document discusses physical and chemical changes. It defines physical changes as changes in a substance's appearance or state without producing a new substance. Chemical changes produce new substances through chemical reactions. Examples of each type of change are provided, along with activities and demonstrations to illustrate the differences between physical and chemical changes. Key terms related to changes in matter are also defined.
Chemical and Physical Changes
A physical change alters a substance's physical properties like shape, size, or state, but does not create new substances. A chemical change produces new substances through chemical reactions, altering both physical and chemical properties. Some key differences are that physical changes are typically reversible without new substances forming, while chemical changes are permanent reactions that form new substances through energy absorption or release. Rusting of iron is a chemical change that occurs when iron reacts with oxygen and water in the air, forming hydrated iron oxide (rust) which damages the iron over time.
Physical Or Chemical Change Qz
Physical changes are changes that do not result in a new substance and can sometimes be reversed, such as melting, freezing, breaking, and cutting. Chemical changes result in new substances through chemical reactions, such as burning, digestion, and rusting, and cannot be reversed. The document provides examples of both physical and chemical changes and discusses their distinguishing properties.
Physical and Chemical Changes
Physical changes involve a change in a substance's physical properties but no new substance is formed. Chemical changes result in a new substance being formed through a chemical reaction. Some examples of physical changes include folding paper, melting wax, and freezing water. Chemical changes include burning paper, the reaction of vinegar and baking soda, and rusting of iron. A key difference is that physical changes are typically reversible while chemical changes produce new substances that cannot be reversed back to the original.
Chemical and physical changes - introduction notes
This document discusses the differences between physical and chemical changes. A physical change alters a substance's physical properties like shape or state, but does not change its chemical composition. Examples include cutting paper, freezing water, or melting butter. A chemical change creates new substances with different chemical compositions through chemical reactions. Indicators of a chemical change include color change, gas production, heat/light release, or cooling. Examples given are burning paper to ash or combining sodium and chlorine to form salt. The document also describes the four states of matter and changes between those states like freezing, melting, vaporization, and condensation.
Physical and chemical changes
This presentation is about the changes which we see in our day to day lives. These changes are classified into two types. Physical And Chemical Changes
Changes in matter.pptx 20013 2014 ( Physical and chemical change)
This document discusses physical and chemical changes in matter. It begins by outlining key questions about how matter changes and objectives to analyze how matter changes physically and chemically. It then provides examples of physical changes like tearing paper, folding a handkerchief, and mixtures. Chemical changes form new substances, like rusting iron or souring milk. Finally, it defines physical changes as changes in size, shape or appearance without new substances, while chemical changes result in new substances and altered properties.
Physical or chemical changes
This document discusses the differences between physical and chemical changes. A physical change alters the form of a substance but does not change its chemical composition, while a chemical change transforms a substance into one with different properties. Some signs of a chemical change include color changes, precipitation, gas production, temperature changes, and changes in characteristic properties like odor. Examples are provided of changes that are physical, like cutting paper or a disappearing puddle, versus those that are chemical, such as burning toast or rocket fuel.
Physical and chemical changes
The document discusses physical and chemical changes. Physical changes alter the state of a substance but do not create a new substance, such as melting, freezing, or breaking something into smaller pieces. Chemical changes form an entirely new substance, evidenced by a change in color, gas release, or new solid forming. Examples of physical changes include shattering a plate or melting wax, while examples of chemical changes include burning wood or rusting metal.
Physical & chemical change
This document discusses the difference between physical and chemical changes in matter. A physical change alters the form or properties of a substance without changing its chemical composition, such as cutting, crushing, dissolving, or changes in state. A chemical change results in one or more new substances being formed through chemical reactions, evidenced by signs like color change, bubbling, gas production or temperature change. Examples of physical changes given are melting ice, sawing wood, and evaporating a puddle. Chemical change examples include burning fuels, baking a cake, and dissolving sugar in tea.
Changing Matter
The document discusses two types of changes: physical changes and chemical changes. It provides examples of each type of change and notes that chemical changes result in new substances being formed, while physical changes do not. The document also compares and contrasts physical and chemical changes. It notes that chemical changes are permanent and difficult to reverse, while physical changes are temporary and can be reversed.
Physical and chemical changes of matter
This document discusses physical and chemical changes of matter. It provides examples of physical changes such as melting, dissolving, and grinding, which change a substance's appearance or state but not its chemical composition. Chemical changes, like burning paper or sugar, produce new substances with different properties from the original. The key difference is that physical changes alter appearance or state while chemical changes alter the actual molecular structure and identity of a substance.
Chemical Changes
A chemical change is a change where one or more new types of matter form as the original materials react and combine in new ways. Some signs that a chemical change has occurred include a change in color, gases being given off, or a change in temperature without external heating or cooling. Common examples of chemical changes provided are burning, rusting, wood ash being left after burning, and fruits or metals oxidizing and changing color when exposed to air.
Chemical & Physical Change Review
This document provides information about studying for a science lab test. It discusses key concepts to review like the properties of matter, how to study lab tools and techniques, and definitions of important science terms. Specific advice includes practicing with lab tools, making graphs, memorizing definitions, using online quizzing resources, and having peers quiz you. Some example review topics are chemical and physical changes, endothermic and exothermic reactions, the law of conservation of mass, phase changes, and the water cycle.
physical_and_chemical changes
This document discusses physical and chemical properties and changes in matter. It defines physical properties as those that can be observed without changing a substance's identity, and chemical properties as those involving a change in identity to produce a new substance. Physical changes alter a substance's form or state without changing its identity, while chemical changes produce a new substance. Examples of each type of change are provided.
Changes matter undergoes
This document discusses physical and chemical changes. It defines physical changes as changes where the substance does not change identity, and chemical changes as changes where the substance is transformed into a new substance. It provides examples of physical changes like melting ice cream and chemical changes like burning a candle. It also discusses how physical and chemical changes are relevant to collecting evidence at crime scenes.
chemical and phsical changes
1) The document discusses physical and chemical changes, providing examples of each from everyday life.
2) A physical change alters a substance's physical properties like shape, size, or state but does not create new substances. It is generally reversible.
3) A chemical change produces new substances through chemical reactions. It is accompanied by changes in heat, light, smell, color or gas production and is not reversible. Common examples are burning, rusting, and food spoilage.
Physical And Chemical Changes
The document compares physical and chemical properties of substances and changes. Physical changes do not alter a substance's identity and can often be reversed, such as melting or freezing. Chemical changes create new substances with different properties through chemical reactions. Clues that a chemical change is occurring include color changes, production of gases, heat, or new odors. Chemical changes like baking a cake cannot be undone since new substances are formed.
Physical vs chemical changes notes
Physical changes alter a substance's appearance or structure but do not change its chemical composition. Examples include melting, freezing, and dissolving. Chemical changes form new substances with different properties through rearrangement of atoms, as seen in rusting, burning, and cooking. Evidence of a chemical change may include production of a gas, change in temperature, formation of a precipitate, or color change. A chemical change can be confirmed if the products of a chemical equation are different from the reactants.
Chemical And Physical Changes Quiz 1
The document is a quiz about chemical and physical changes for 5th grade physical science students. It contains multiple choice questions about examples of physical and chemical changes, such as nitrogen becoming a liquid through cooling, water changing state through boiling and freezing, and ice melting into water. It also asks students to identify clues that a chemical change occurred, like a change in color or smell.
5.6 Physical & Chemical Changes
Physical changes alter a substance's size, shape, or state but do not change its chemical composition. They can be reversed through processes like freezing, melting, evaporation, and condensation. Chemical changes form new substances with different properties that cannot be reversed, such as burning wood to form ash. The document discusses the differences between physical changes like freezing water and chemical changes like burning wood.
Changes in Matter
Physical changes alter the state or form of a substance without changing its chemical identity, and are reversible. Chemical changes transform one or more substances into new substances with different properties, are indicated by color changes, formation of precipitates or gas bubbles, production of heat or light, and are not easily reversible. Physical and chemical changes can be distinguished by whether the identity of the substance is conserved and if the change is reversible.
Physical Or Chemical Change Qz3371
Physical changes alter the physical properties of a substance but do not change its chemical composition. Chemical changes produce new substances through chemical reactions. Some signs that a chemical change has occurred include a color change, gas formation, changes in temperature or light emission, precipitation of a solid, or production of a gas. Common examples of physical changes are melting, freezing, and cutting, while chemical changes include burning, digestion, and rusting.
Physical and chemical changes
This document discusses physical and chemical changes. It defines physical changes as changes where a substance undergoes change without forming a new substance, and chemical changes as changes where new substances are formed. It provides examples like heating water and melting butter as physical changes, and cooking food and lighting a match as chemical changes. The document also discusses the rusting of iron as a chemical change, outlining factors that affect rusting like moisture, acid, salt, and impurities. It describes galvanization and using stainless steel as ways to prevent rusting of iron. Finally, it briefly discusses crystallization as a physical change involving deriving crystals from solutions.
changesofmatter-120111022019-phpapp01.pptx
This document discusses physical and chemical changes in matter. It defines physical changes as changes in state or form without a change in chemical composition, such as water freezing to ice. Chemical changes result in new substances forming through chemical reactions, as seen when iron rusts. The document outlines several properties and signs that can indicate if a physical or chemical change has occurred, such as changes in density, melting point, or the production of gas.
physical and chemical property and physical and chemical change
The document defines physical and chemical properties and changes. It states that physical properties can be observed without changing the substance's composition, and includes intensive properties that do not depend on amount and extensive properties that do. Chemical properties describe a substance's ability to change into a new substance through a chemical reaction. The document distinguishes between physical changes, which alter a substance's state or form without creating a new substance, and chemical changes, which produce new substances and are generally not reversible through physical processes alone.
More Related Content
What's hot
Chemical and physical changes - introduction notes
This document discusses the differences between physical and chemical changes. A physical change alters a substance's physical properties like shape or state, but does not change its chemical composition. Examples include cutting paper, freezing water, or melting butter. A chemical change creates new substances with different chemical compositions through chemical reactions. Indicators of a chemical change include color change, gas production, heat/light release, or cooling. Examples given are burning paper to ash or combining sodium and chlorine to form salt. The document also describes the four states of matter and changes between those states like freezing, melting, vaporization, and condensation.
Physical and chemical changes
This presentation is about the changes which we see in our day to day lives. These changes are classified into two types. Physical And Chemical Changes
Changes in matter.pptx 20013 2014 ( Physical and chemical change)
This document discusses physical and chemical changes in matter. It begins by outlining key questions about how matter changes and objectives to analyze how matter changes physically and chemically. It then provides examples of physical changes like tearing paper, folding a handkerchief, and mixtures. Chemical changes form new substances, like rusting iron or souring milk. Finally, it defines physical changes as changes in size, shape or appearance without new substances, while chemical changes result in new substances and altered properties.
Physical or chemical changes
This document discusses the differences between physical and chemical changes. A physical change alters the form of a substance but does not change its chemical composition, while a chemical change transforms a substance into one with different properties. Some signs of a chemical change include color changes, precipitation, gas production, temperature changes, and changes in characteristic properties like odor. Examples are provided of changes that are physical, like cutting paper or a disappearing puddle, versus those that are chemical, such as burning toast or rocket fuel.
Physical and chemical changes
The document discusses physical and chemical changes. Physical changes alter the state of a substance but do not create a new substance, such as melting, freezing, or breaking something into smaller pieces. Chemical changes form an entirely new substance, evidenced by a change in color, gas release, or new solid forming. Examples of physical changes include shattering a plate or melting wax, while examples of chemical changes include burning wood or rusting metal.
Physical & chemical change
This document discusses the difference between physical and chemical changes in matter. A physical change alters the form or properties of a substance without changing its chemical composition, such as cutting, crushing, dissolving, or changes in state. A chemical change results in one or more new substances being formed through chemical reactions, evidenced by signs like color change, bubbling, gas production or temperature change. Examples of physical changes given are melting ice, sawing wood, and evaporating a puddle. Chemical change examples include burning fuels, baking a cake, and dissolving sugar in tea.
Changing Matter
The document discusses two types of changes: physical changes and chemical changes. It provides examples of each type of change and notes that chemical changes result in new substances being formed, while physical changes do not. The document also compares and contrasts physical and chemical changes. It notes that chemical changes are permanent and difficult to reverse, while physical changes are temporary and can be reversed.
Physical and chemical changes of matter
This document discusses physical and chemical changes of matter. It provides examples of physical changes such as melting, dissolving, and grinding, which change a substance's appearance or state but not its chemical composition. Chemical changes, like burning paper or sugar, produce new substances with different properties from the original. The key difference is that physical changes alter appearance or state while chemical changes alter the actual molecular structure and identity of a substance.
Chemical Changes
A chemical change is a change where one or more new types of matter form as the original materials react and combine in new ways. Some signs that a chemical change has occurred include a change in color, gases being given off, or a change in temperature without external heating or cooling. Common examples of chemical changes provided are burning, rusting, wood ash being left after burning, and fruits or metals oxidizing and changing color when exposed to air.
Chemical & Physical Change Review
This document provides information about studying for a science lab test. It discusses key concepts to review like the properties of matter, how to study lab tools and techniques, and definitions of important science terms. Specific advice includes practicing with lab tools, making graphs, memorizing definitions, using online quizzing resources, and having peers quiz you. Some example review topics are chemical and physical changes, endothermic and exothermic reactions, the law of conservation of mass, phase changes, and the water cycle.
physical_and_chemical changes
This document discusses physical and chemical properties and changes in matter. It defines physical properties as those that can be observed without changing a substance's identity, and chemical properties as those involving a change in identity to produce a new substance. Physical changes alter a substance's form or state without changing its identity, while chemical changes produce a new substance. Examples of each type of change are provided.
Changes matter undergoes
This document discusses physical and chemical changes. It defines physical changes as changes where the substance does not change identity, and chemical changes as changes where the substance is transformed into a new substance. It provides examples of physical changes like melting ice cream and chemical changes like burning a candle. It also discusses how physical and chemical changes are relevant to collecting evidence at crime scenes.
chemical and phsical changes
1) The document discusses physical and chemical changes, providing examples of each from everyday life.
2) A physical change alters a substance's physical properties like shape, size, or state but does not create new substances. It is generally reversible.
3) A chemical change produces new substances through chemical reactions. It is accompanied by changes in heat, light, smell, color or gas production and is not reversible. Common examples are burning, rusting, and food spoilage.
Physical And Chemical Changes
The document compares physical and chemical properties of substances and changes. Physical changes do not alter a substance's identity and can often be reversed, such as melting or freezing. Chemical changes create new substances with different properties through chemical reactions. Clues that a chemical change is occurring include color changes, production of gases, heat, or new odors. Chemical changes like baking a cake cannot be undone since new substances are formed.
Physical vs chemical changes notes
Physical changes alter a substance's appearance or structure but do not change its chemical composition. Examples include melting, freezing, and dissolving. Chemical changes form new substances with different properties through rearrangement of atoms, as seen in rusting, burning, and cooking. Evidence of a chemical change may include production of a gas, change in temperature, formation of a precipitate, or color change. A chemical change can be confirmed if the products of a chemical equation are different from the reactants.
Chemical And Physical Changes Quiz 1
The document is a quiz about chemical and physical changes for 5th grade physical science students. It contains multiple choice questions about examples of physical and chemical changes, such as nitrogen becoming a liquid through cooling, water changing state through boiling and freezing, and ice melting into water. It also asks students to identify clues that a chemical change occurred, like a change in color or smell.
5.6 Physical & Chemical Changes
Physical changes alter a substance's size, shape, or state but do not change its chemical composition. They can be reversed through processes like freezing, melting, evaporation, and condensation. Chemical changes form new substances with different properties that cannot be reversed, such as burning wood to form ash. The document discusses the differences between physical changes like freezing water and chemical changes like burning wood.
Changes in Matter
Physical changes alter the state or form of a substance without changing its chemical identity, and are reversible. Chemical changes transform one or more substances into new substances with different properties, are indicated by color changes, formation of precipitates or gas bubbles, production of heat or light, and are not easily reversible. Physical and chemical changes can be distinguished by whether the identity of the substance is conserved and if the change is reversible.
Physical Or Chemical Change Qz3371
Physical changes alter the physical properties of a substance but do not change its chemical composition. Chemical changes produce new substances through chemical reactions. Some signs that a chemical change has occurred include a color change, gas formation, changes in temperature or light emission, precipitation of a solid, or production of a gas. Common examples of physical changes are melting, freezing, and cutting, while chemical changes include burning, digestion, and rusting.
Physical and chemical changes
This document discusses physical and chemical changes. It defines physical changes as changes where a substance undergoes change without forming a new substance, and chemical changes as changes where new substances are formed. It provides examples like heating water and melting butter as physical changes, and cooking food and lighting a match as chemical changes. The document also discusses the rusting of iron as a chemical change, outlining factors that affect rusting like moisture, acid, salt, and impurities. It describes galvanization and using stainless steel as ways to prevent rusting of iron. Finally, it briefly discusses crystallization as a physical change involving deriving crystals from solutions.
What's hot (20)
Chemical and physical changes - introduction notes
Chemical and physical changes - introduction notes
Changes in matter.pptx 20013 2014 ( Physical and chemical change)
Changes in matter.pptx 20013 2014 ( Physical and chemical change)
Similar to Unit b matter and chemical change notes(physical & chemical changes)
changesofmatter-120111022019-phpapp01.pptx
This document discusses physical and chemical changes in matter. It defines physical changes as changes in state or form without a change in chemical composition, such as water freezing to ice. Chemical changes result in new substances forming through chemical reactions, as seen when iron rusts. The document outlines several properties and signs that can indicate if a physical or chemical change has occurred, such as changes in density, melting point, or the production of gas.
physical and chemical property and physical and chemical change
The document defines physical and chemical properties and changes. It states that physical properties can be observed without changing the substance's composition, and includes intensive properties that do not depend on amount and extensive properties that do. Chemical properties describe a substance's ability to change into a new substance through a chemical reaction. The document distinguishes between physical changes, which alter a substance's state or form without creating a new substance, and chemical changes, which produce new substances and are generally not reversible through physical processes alone.
Density Common Chemical Changes Q And A
This document discusses physical and chemical properties and changes in matter. It provides examples of physical properties including state, size, mass, density, and magnetic properties. Examples of physical changes include changes in state, dissolving, and changes in shape. Chemical properties include ability to burn and examples of chemical changes are burning and rusting. The document also discusses signs that a chemical change has occurred such as release of energy, change in odor or color, and formation of gases or solids.
Physical & Chemical Changes
This document discusses physical and chemical changes. It defines physical changes as changes that do not alter the chemical composition of a substance and are typically reversible, such as freezing or dissolving. Chemical changes alter the chemical composition by producing new substances, are not easily reversible, and result in changes like formation of a gas or precipitate, changes in color or mass. Examples of each type of change are provided along with signs that indicate whether a change is physical or chemical. Common chemical reactions like synthesis, decomposition, precipitation, and acid-base neutralization are also outlined.
Changes of matter
A physical change alters a substance's form or appearance but not its chemical composition, such as water freezing to ice. A chemical change creates new substances through molecular rearrangement, like iron rusting due to oxidation. Chemical changes can be identified by changes in properties such as density, melting point, or reactions producing gas.
Chemicall change
This document discusses observing and describing chemical changes. It defines chemical and physical properties and changes. A chemical change results in a new substance, while a physical change only changes the appearance or form of a substance. Chemical changes involve reactants changing into products and can be represented by chemical equations. They involve breaking and forming bonds. Evidence of a chemical change includes new properties, energy changes, and conservation of mass, with the same number and types of atoms in the reactants and products. A system can be open or closed to matter flow during chemical reactions.
Describing matter powerpoint
Matter can exist in three states - solid, liquid, and gas. Examples of solids are ice and diamonds; examples of liquids are water and mercury. Gases include water vapor and oxygen. Characteristic properties like boiling point and melting point are used to identify substances and do not change, even if the substance changes state. Physical changes alter the substance's form through processes like melting or crushing, but do not change its chemical makeup. Chemical changes form new substances through chemical reactions.
Properties of matter
The document discusses the properties of matter at the molecular level. It defines matter as anything that has volume and mass, and describes physical properties like color, size, and state that can be observed without changing a substance's identity. Chemical properties describe a substance's ability to change into a new substance and are not as easy to observe. The document also distinguishes between physical changes like melting that do not form new substances, and chemical changes like baking or rusting that produce entirely new substances.
PHYSICAL AND CHEMICAL CHANGE
This document discusses the differences between physical and chemical changes. Physical changes can be easily undone and do not change the substance's composition, though the substance's state or the arrangement of its molecules may change. Chemical changes result in a new substance through molecular rearrangement and cannot be easily reversed. Examples of physical changes include breaking or cutting an object, while examples of chemical changes include burning wood or digesting food.
Matter (Edre)
This document discusses different types of matter and changes in states of matter. It defines matter as anything that takes up space and has mass, and describes the three common states as solids, liquids, and gases. Examples are given of materials in each state. Physical changes that do not alter the chemical makeup of a substance, like melting, boiling, and condensation, are distinguished from chemical changes where new substances are formed. The document also defines homogeneous materials as having identical properties throughout and heterogeneous materials as having varying properties due to different components.
Module 7_Differentiating physical and chemical change.pptx
This document discusses the differences between physical and chemical changes. Physical changes alter a substance's physical properties, like shape or state, without changing its chemical composition. Examples include melting, freezing, cutting, and bending. Chemical changes produce new substances through chemical reactions that alter a substance's chemical makeup, like burning sugar or rotting fruit. Chemical changes are irreversible, while many physical changes can be reversed. Signs of a physical change include alterations in shape, state, or other properties, while signs of a chemical change involve changes in color, temperature, light/gas production, or taste.
Josh physical + chemical change
A physical change alters the form or shape of a substance but does not change its chemical composition, while a chemical change produces one or more new substances. Examples of chemical changes include burning a log or frying an egg, which change color and properties. Chemical changes are important because they underlie processes like producing clothing and food as well as energy generation in living things.
Physchem
The document discusses the differences between physical and chemical changes. A physical change alters a substance's properties like shape, size or state but does not change its chemical makeup. A chemical change creates new substances through molecular rearrangement. Examples of physical changes include cutting paper or crushing aspirin while chemical changes include burning logs or breaking down water into hydrogen and oxygen.
8.5 chemical reactions
This document discusses how to identify chemical reactions and changes through various signs and properties. It defines chemical and physical changes, noting that a chemical change results in a new substance. It then outlines several signs that a chemical reaction has occurred, including color changes, gas production, changes in energy, and formation of precipitates. Specific examples are provided for each, such as burning toast resulting in a color change and vinegar and baking soda producing gas. The document emphasizes that a chemical reaction can be identified by the formation of a new substance with different chemical and physical properties compared to the original substances.
Cells
This document provides information about the three states of matter: solids, liquids, and gases. It defines each state, provides examples, and discusses physical and chemical changes. Users can learn about each state through short sections and then test their knowledge with a multiple choice quiz at the end.
States of matter
This document provides information about the three states of matter - solids, liquids, and gases. It defines each state, provides examples, and describes how physical properties differ between states. The document also discusses physical and chemical changes, giving examples of each type. A short quiz at the end tests the reader's understanding of states of matter and changes between states.
Chemical and physical changes PPT Bigger version
The butterfly life cycle is most similar to a chemical change because during the life cycle the organism fundamentally changes from one type of being (egg, larva, pupa) into another distinct type of being (adult butterfly). This represents a change in identity or substance, which is characteristic of a chemical change.
03 Chemical Reactions
This document provides an overview of chemical reactions and changes. It defines a chemical reaction as a process that changes one set of chemicals into another. It discusses reagents (reactants) and products. It distinguishes between physical and chemical changes, providing examples of each. Signs of a chemical change are described as the formation of a precipitate, color change, bubbles, temperature change, or new odor. The law of conservation of mass is explained. Chemical equations are introduced and the importance of balancing equations is described through an example. Finally, practice problems are provided to test understanding of these concepts.
Chemistry Changes Around Us Grade 5 to 6
In this u can learn about all the types of water and changes around us This is for grade 4-6
Click *here for free download
PROPERTIES OF MATTER.pdf
The document discusses the key properties and states of matter. It defines matter as anything that has mass and takes up space, and identifies three common states of matter - solids, liquids, and gases. It distinguishes between physical and chemical properties, and physical and chemical changes. The document also covers mixtures and solutions, the conservation of mass, and provides an example problem calculating the mass of a product in a chemical reaction.
Similar to Unit b matter and chemical change notes(physical & chemical changes) (20)
physical and chemical property and physical and chemical change
physical and chemical property and physical and chemical change
Module 7_Differentiating physical and chemical change.pptx
Module 7_Differentiating physical and chemical change.pptx
More from RileyAntler
Structural forms
The document provides instructions for a structural engineering challenge to build the tallest structure possible using 5 pieces of paper and masking tape within 10 minutes. It defines key structural concepts like strength, stability, and the three basic structural forms: solid/mass, frame, and shell structures. A sketch of the completed structure must be provided.
Unit d structures & forces
The document provides instructions for a classroom activity where students must build the tallest structure possible using only 5 pieces of blank paper and masking tape within 10 minutes. It defines what a structure is and discusses the concepts of structural strength, stability, and the three basic structural forms: solid/mass, frame, and shell structures. A hybrid structure is noted as a combination of two or more forms.
Electromagnetic spectrum
The document discusses the wave model of light and the electromagnetic spectrum. It explains that light is a form of energy that travels in waves, with characteristics like wavelength, frequency, amplitude, and crest and trough. The electromagnetic spectrum encompasses all forms of energy that travel as waves, including light, which is classified based on its wavelength.
Light sources
Incandescent lightbulbs produce light through heating while fluorescent and phosphorescent lights use electricity to excite particles that then glow and produce visible light. Fluorescent lights are more energy efficient than incandescent but contain toxic materials, while phosphorescent lights continue glowing after the energy source is removed. Chemiluminescent and bioluminescent lights produce light through chemical reactions, as seen in glow sticks and deep sea creatures, respectively.
Unit c light and optics
The document discusses different types of light sources:
- Incandescent light bulbs produce light by heating a filament to high temperatures. Most of the energy is released as heat.
- Fluorescent lights use electricity to excite mercury vapor which produces ultraviolet light, causing a phosphor coating to glow and produce visible light. They are more energy efficient but harder to dispose of than incandescent lights.
- Phosphorescent materials continue to glow for a period of time after the light source is removed by slowly releasing stored energy.
- Chemiluminescent and bioluminescent reactions produce light through chemical processes in glow sticks and deep sea creatures.
- Light is a type of electromagnetic wave.
Excretory system
The excretory system works to maintain balance in the body by filtering waste and toxins from the blood and eliminating them from the body. It is led by the kidneys, which filter waste through tiny nephrons. The kidneys then produce urine, which travels through ureters to the bladder for storage and is later released through the urethra. In addition to the kidneys, the large intestine, liver, skin, and lungs all play roles in excretion to eliminate various waste products.
Nervous system
The nervous system is divided into the central nervous system (CNS), which includes the brain and spinal cord, and the peripheral nervous system (PNS). The PNS sends sensory information to the CNS and carries out the CNS's instructions through the body. The peripheral nervous system consists of the autonomic nervous system, which controls involuntary functions, and the somatic system, which controls voluntary movement and reflexes. Neurons are the basic functional units that transmit chemical and electrical signals throughout the nervous system.
Circulatory system
The circulatory system has two circuits - one sends blood to the lungs to receive oxygen and return to the heart, while the second sends oxygenated blood from the lungs to the rest of the body. Arteries carry blood away from the heart, veins carry blood back to the heart, and capillaries allow for gas exchange between blood and tissues. The heart is divided into four chambers - two atria that receive blood and two ventricles that pump blood out, with the right side pumping to the lungs and left side pumping to the body.
Specialized cells & tissues
Specialized cells combine to form four main tissue types in humans and animals - connective, epithelial, nervous, and muscle tissue. Connective tissue supports and connects parts of the body, epithelial tissue covers the outside of the body and lines organs, nervous tissue makes up the brain and spinal cord, and muscle tissue allows movement. Cells also combine to form three tissue types in plants - photosynthetic tissue uses sunlight to produce energy, protective tissue forms a waterproof layer, and transport tissue moves food and water.
Cell transport
This document discusses several concepts related to cell transport. It defines concentration and explains that diffusion is the movement of particles from an area of high concentration to low concentration. It also defines permeable, impermeable, and semi-permeable membranes. A semi-permeable membrane, like the cell membrane, allows some substances like water and small particles to pass through via diffusion while blocking larger particles, which require channel proteins. The document also explains that osmosis is a special type of diffusion where water moves through a semi-permeable membrane from a low solute concentration to a high solute concentration. The tonicity of the environment determines whether cells appear bloated or shrunken.
The cell
All organisms are made of cells, which contain specialized structures called organelles that each perform a specific function. Cells work together to form tissues, organs, and organ systems. Cells can be thought of as living factories containing organelles that act as the nucleus directing activities, mitochondria generating energy, a cell membrane controlling what enters and exits, vacuoles storing materials, cytoplasm providing nutrients, and in plant cells, a cell wall providing structure and chloroplasts carrying out photosynthesis.
Unit b cells & systems
The document provides information about microscopes and cells. It discusses the first microscope invented by Zacharias Janssen and how it allowed humans to see a new microscopic world. It then explains the basic parts and use of the compound light microscope, including how lenses are used to enlarge images and micrometers are used to measure tiny objects. It also discusses estimating sizes of objects viewed under the microscope using the field of view. The document concludes by outlining the six main characteristics of living things: made of cells, need energy, grow and develop, respond to environment, reproduce, and have adaptations.
Biomagnification
Biomagnification refers to the increasing concentration of chemicals as they move up the food chain. Chemicals accumulate in plants and algae, which are then eaten by smaller fish, building up further in larger fish and predatory birds and mammals. This can lead to toxic levels of chemicals like mercury and pesticides in organisms high on the food chain, including humans. An example given is how mercury from power plant emissions concentrates over 10,000 times moving from water to algae to fish to humans. Exposure to high levels of biomagnified chemicals can cause illness and affect offspring.
Transporting chemicals
Chemicals can be transported through the air, groundwater, surface water, and soil. In the air, chemicals disperse and deposit based on their properties and wind patterns. Groundwater transports chemicals slowly through permeable soil. Surface water carries dissolved chemicals long distances while non-dissolved chemicals sink and concentrate near the source. Chemicals also leach through soil, with the rate affected by soil composition.
Monitoring the atmosphere
The document discusses greenhouse gases and their role in trapping heat in the atmosphere. It defines greenhouse gases as atmospheric gases like carbon dioxide, water vapor, and methane that trap heat. It then explains the greenhouse effect as radiant energy from the sun being reflected back to the Earth's surface by a layer of these gases, trapping heat. It also discusses the enhanced greenhouse effect caused by increased carbon dioxide emissions from human activities and deforestation, which add to the heat-trapping in the atmosphere. A separate section explains ozone depletion and the ozone layer, which protects the Earth from UV radiation, and how CFC chemicals released into the atmosphere break down the ozone.
Monitoring air quality
Air quality is determined by measuring pollutant levels in the air and estimating emissions from sources. Common air pollutants include sulfur dioxide, nitrogen oxides, and ground-level ozone. Sulfur dioxide forms smog and acid rain and affects respiratory and eye health, produced from burning coal and oil. Nitrogen oxides are produced from vehicle and industrial combustion and cause smog. Ground-level ozone forms from reactions between oxygen, nitrogen oxides and volatile organic compounds from vehicles, industry and trees, and can cause breathing problems.
Monitoring water quality
Monitoring water quality is important to detect harmful pollutants and their concentrations. Five important chemical factors that indicate water quality are undissolved solids, phosphates and nitrates, dissolved oxygen, dissolved carbon dioxide, and heavy metals. Each of these factors can be tested through specific chemical reactions to determine their presence and concentration in water samples. Biological indicators like the presence of certain aquatic organisms can also help assess water quality.
Human impacts
Human activities like agriculture, solid waste disposal, and industry have significantly impacted the environment by adding and releasing chemicals. Agriculture contributes to eutrophication through fertilizers containing nitrogen and phosphorus and pesticides that can accumulate up the food chain. Solid waste disposal in landfills produces leachate containing heavy metals and other toxins that seep into soil and water without protective layers. Wastewater from daily use also contaminates the environment with chemicals even after treatment at sewage plants. Burning fossil fuels further pollutes the air with gases causing acid rain and air pollution.
Transport of substances
This document discusses several methods of transporting substances in biology. Diffusion is the passive movement of particles from high to low concentration. Osmosis is a type of diffusion where water moves through a membrane. Active transport moves nutrients against a concentration gradient using energy. Ingestion directly takes substances in, while hydrolysis uses enzymes and water to break down larger molecules. A substrate provides nutrients and a surface for an organism to live or move on.
Acids & bases
This document defines acids and bases, their properties, and how pH is used to measure acidity and alkalinity. Acids have a pH below 7 and increase hydrogen ion concentration in water, tasting sour. Bases have a pH above 7 and increase hydroxyl ion concentration, tasting bitter. Neutral substances have a pH of 7. pH is measured on a scale of 0-14, with lower numbers being more acidic and higher more basic. Acid rain forms when rainwater reacts with air pollutants like sulfur dioxide and nitrogen oxides from industry and vehicles.
More from RileyAntler (20)
Recently uploaded
The use of Nauplii and metanauplii artemia in aquaculture (brine shrimp).pptx
Although Artemia has been known to man for centuries, its use as a food for the culture of larval organisms apparently began only in the 1930s, when several investigators found that it made an excellent food for newly hatched fish larvae (Litvinenko et al., 2023). As aquaculture developed in the 1960s and ‘70s, the use of Artemia also became more widespread, due both to its convenience and to its nutritional value for larval organisms (Arenas-Pardo et al., 2024). The fact that Artemia dormant cysts can be stored for long periods in cans, and then used as an off-the-shelf food requiring only 24 h of incubation makes them the most convenient, least labor-intensive, live food available for aquaculture (Sorgeloos & Roubach, 2021). The nutritional value of Artemia, especially for marine organisms, is not constant, but varies both geographically and temporally. During the last decade, however, both the causes of Artemia nutritional variability and methods to improve poorquality Artemia have been identified (Loufi et al., 2024).
Brine shrimp (Artemia spp.) are used in marine aquaculture worldwide. Annually, more than 2,000 metric tons of dry cysts are used for cultivation of fish, crustacean, and shellfish larva. Brine shrimp are important to aquaculture because newly hatched brine shrimp nauplii (larvae) provide a food source for many fish fry (Mozanzadeh et al., 2021). Culture and harvesting of brine shrimp eggs represents another aspect of the aquaculture industry. Nauplii and metanauplii of Artemia, commonly known as brine shrimp, play a crucial role in aquaculture due to their nutritional value and suitability as live feed for many aquatic species, particularly in larval stages (Sorgeloos & Roubach, 2021).
Remote Sensing and Computational, Evolutionary, Supercomputing, and Intellige...
Remote Sensing and Computational, Evolutionary, Supercomputing, and Intellige...University of Maribor
Slides from talk:
Aleš Zamuda: Remote Sensing and Computational, Evolutionary, Supercomputing, and Intelligent Systems.
11th International Conference on Electrical, Electronics and Computer Engineering (IcETRAN), Niš, 3-6 June 2024
Inter-Society Networking Panel GRSS/MTT-S/CIS Panel Session: Promoting Connection and Cooperation
https://www.etran.rs/2024/en/home-english/bordetella pertussis.................................ppt
Bordettela is a gram negative cocobacilli spread by air born drop let
Comparing Evolved Extractive Text Summary Scores of Bidirectional Encoder Rep...
Comparing Evolved Extractive Text Summary Scores of Bidirectional Encoder Rep...University of Maribor
Slides from:
11th International Conference on Electrical, Electronics and Computer Engineering (IcETRAN), Niš, 3-6 June 2024
Track: Artificial Intelligence
https://www.etran.rs/2024/en/home-english/What is greenhouse gasses and how many gasses are there to affect the Earth.
What are greenhouse gasses how they affect the earth and its environment what is the future of the environment and earth how the weather and the climate effects.
Cytokines and their role in immune regulation.pptx
This presentation covers the content and information on "Cytokines " and their role in immune regulation .
SAR of Medicinal Chemistry 1st by dk.pdf
In this presentation include the prototype drug SAR on thus or with their examples .
Syllabus of Second Year B. Pharmacy
2019 PATTERN.
Thornton ESPP slides UK WW Network 4_6_24.pdf
ESPP presentation to EU Waste Water Network, 4th June 2024 “EU policies driving nutrient removal and recycling
and the revised UWWTD (Urban Waste Water Treatment Directive)”
Applied Science: Thermodynamics, Laws & Methodology.pdf
When I was asked to give a companion lecture in support of ‘The Philosophy of Science’ (https://shorturl.at/4pUXz) I decided not to walk through the detail of the many methodologies in order of use. Instead, I chose to employ a long standing, and ongoing, scientific development as an exemplar. And so, I chose the ever evolving story of Thermodynamics as a scientific investigation at its best.
Conducted over a period of >200 years, Thermodynamics R&D, and application, benefitted from the highest levels of professionalism, collaboration, and technical thoroughness. New layers of application, methodology, and practice were made possible by the progressive advance of technology. In turn, this has seen measurement and modelling accuracy continually improved at a micro and macro level.
Perhaps most importantly, Thermodynamics rapidly became a primary tool in the advance of applied science/engineering/technology, spanning micro-tech, to aerospace and cosmology. I can think of no better a story to illustrate the breadth of scientific methodologies and applications at their best.
Travis Hills' Endeavors in Minnesota: Fostering Environmental and Economic Pr...
Travis Hills of Minnesota developed a method to convert waste into high-value dry fertilizer, significantly enriching soil quality. By providing farmers with a valuable resource derived from waste, Travis Hills helps enhance farm profitability while promoting environmental stewardship. Travis Hills' sustainable practices lead to cost savings and increased revenue for farmers by improving resource efficiency and reducing waste.
Nucleophilic Addition of carbonyl compounds.pptx
Nucleophilic addition is the most important reaction of carbonyls. Not just aldehydes and ketones, but also carboxylic acid derivatives in general.
Carbonyls undergo addition reactions with a large range of nucleophiles.
Comparing the relative basicity of the nucleophile and the product is extremely helpful in determining how reversible the addition reaction is. Reactions with Grignards and hydrides are irreversible. Reactions with weak bases like halides and carboxylates generally don’t happen.
Electronic effects (inductive effects, electron donation) have a large impact on reactivity.
Large groups adjacent to the carbonyl will slow the rate of reaction.
Neutral nucleophiles can also add to carbonyls, although their additions are generally slower and more reversible. Acid catalysis is sometimes employed to increase the rate of addition.
Unlocking the mysteries of reproduction: Exploring fecundity and gonadosomati...
The pygmy halfbeak Dermogenys colletei, is known for its viviparous nature, this presents an intriguing case of relatively low fecundity, raising questions about potential compensatory reproductive strategies employed by this species. Our study delves into the examination of fecundity and the Gonadosomatic Index (GSI) in the Pygmy Halfbeak, D. colletei (Meisner, 2001), an intriguing viviparous fish indigenous to Sarawak, Borneo. We hypothesize that the Pygmy halfbeak, D. colletei, may exhibit unique reproductive adaptations to offset its low fecundity, thus enhancing its survival and fitness. To address this, we conducted a comprehensive study utilizing 28 mature female specimens of D. colletei, carefully measuring fecundity and GSI to shed light on the reproductive adaptations of this species. Our findings reveal that D. colletei indeed exhibits low fecundity, with a mean of 16.76 ± 2.01, and a mean GSI of 12.83 ± 1.27, providing crucial insights into the reproductive mechanisms at play in this species. These results underscore the existence of unique reproductive strategies in D. colletei, enabling its adaptation and persistence in Borneo's diverse aquatic ecosystems, and call for further ecological research to elucidate these mechanisms. This study lends to a better understanding of viviparous fish in Borneo and contributes to the broader field of aquatic ecology, enhancing our knowledge of species adaptations to unique ecological challenges.
ANAMOLOUS SECONDARY GROWTH IN DICOT ROOTS.pptx
Abnormal or anomalous secondary growth in plants. It defines secondary growth as an increase in plant girth due to vascular cambium or cork cambium. Anomalous secondary growth does not follow the normal pattern of a single vascular cambium producing xylem internally and phloem externally.
The binding of cosmological structures by massless topological defects
Assuming spherical symmetry and weak field, it is shown that if one solves the Poisson equation or the Einstein field
equations sourced by a topological defect, i.e. a singularity of a very specific form, the result is a localized gravitational
field capable of driving flat rotation (i.e. Keplerian circular orbits at a constant speed for all radii) of test masses on a thin
spherical shell without any underlying mass. Moreover, a large-scale structure which exploits this solution by assembling
concentrically a number of such topological defects can establish a flat stellar or galactic rotation curve, and can also deflect
light in the same manner as an equipotential (isothermal) sphere. Thus, the need for dark matter or modified gravity theory is
mitigated, at least in part.
THEMATIC APPERCEPTION TEST(TAT) cognitive abilities, creativity, and critic...
THEMATIC APPERCEPTION TEST(TAT) cognitive abilities, creativity, and critic...Abdul Wali Khan University Mardan,kP,Pakistan
hematic appreciation test is a psychological assessment tool used to measure an individual's appreciation and understanding of specific themes or topics. This test helps to evaluate an individual's ability to connect different ideas and concepts within a given theme, as well as their overall comprehension and interpretation skills. The results of the test can provide valuable insights into an individual's cognitive abilities, creativity, and critical thinking skillsEquivariant neural networks and representation theory
Or: Beyond linear.
Abstract: Equivariant neural networks are neural networks that incorporate symmetries. The nonlinear activation functions in these networks result in interesting nonlinear equivariant maps between simple representations, and motivate the key player of this talk: piecewise linear representation theory.
Disclaimer: No one is perfect, so please mind that there might be mistakes and typos.
dtubbenhauer@gmail.com
Corrected slides: dtubbenhauer.com/talks.html
The debris of the ‘last major merger’ is dynamically young
The Milky Way’s (MW) inner stellar halo contains an [Fe/H]-rich component with highly eccentric orbits, often referred to as the
‘last major merger.’ Hypotheses for the origin of this component include Gaia-Sausage/Enceladus (GSE), where the progenitor
collided with the MW proto-disc 8–11 Gyr ago, and the Virgo Radial Merger (VRM), where the progenitor collided with the
MW disc within the last 3 Gyr. These two scenarios make different predictions about observable structure in local phase space,
because the morphology of debris depends on how long it has had to phase mix. The recently identified phase-space folds in Gaia
DR3 have positive caustic velocities, making them fundamentally different than the phase-mixed chevrons found in simulations
at late times. Roughly 20 per cent of the stars in the prograde local stellar halo are associated with the observed caustics. Based
on a simple phase-mixing model, the observed number of caustics are consistent with a merger that occurred 1–2 Gyr ago.
We also compare the observed phase-space distribution to FIRE-2 Latte simulations of GSE-like mergers, using a quantitative
measurement of phase mixing (2D causticality). The observed local phase-space distribution best matches the simulated data
1–2 Gyr after collision, and certainly not later than 3 Gyr. This is further evidence that the progenitor of the ‘last major merger’
did not collide with the MW proto-disc at early times, as is thought for the GSE, but instead collided with the MW disc within
the last few Gyr, consistent with the body of work surrounding the VRM.
20240520 Planning a Circuit Simulator in JavaScript.pptx
Evaporation step counter work. I have done a physical experiment.
(Work in progress.)
Recently uploaded (20)
The use of Nauplii and metanauplii artemia in aquaculture (brine shrimp).pptx
The use of Nauplii and metanauplii artemia in aquaculture (brine shrimp).pptx
Remote Sensing and Computational, Evolutionary, Supercomputing, and Intellige...
Remote Sensing and Computational, Evolutionary, Supercomputing, and Intellige...
bordetella pertussis.................................ppt
bordetella pertussis.................................ppt
Comparing Evolved Extractive Text Summary Scores of Bidirectional Encoder Rep...
Comparing Evolved Extractive Text Summary Scores of Bidirectional Encoder Rep...
What is greenhouse gasses and how many gasses are there to affect the Earth.
What is greenhouse gasses and how many gasses are there to affect the Earth.
Cytokines and their role in immune regulation.pptx
Cytokines and their role in immune regulation.pptx
Applied Science: Thermodynamics, Laws & Methodology.pdf
Applied Science: Thermodynamics, Laws & Methodology.pdf
Travis Hills' Endeavors in Minnesota: Fostering Environmental and Economic Pr...
Travis Hills' Endeavors in Minnesota: Fostering Environmental and Economic Pr...
Unlocking the mysteries of reproduction: Exploring fecundity and gonadosomati...
Unlocking the mysteries of reproduction: Exploring fecundity and gonadosomati...
The binding of cosmological structures by massless topological defects
The binding of cosmological structures by massless topological defects
THEMATIC APPERCEPTION TEST(TAT) cognitive abilities, creativity, and critic...
THEMATIC APPERCEPTION TEST(TAT) cognitive abilities, creativity, and critic...
Equivariant neural networks and representation theory
Equivariant neural networks and representation theory
The debris of the ‘last major merger’ is dynamically young
The debris of the ‘last major merger’ is dynamically young
20240520 Planning a Circuit Simulator in JavaScript.pptx
20240520 Planning a Circuit Simulator in JavaScript.pptx
Unit b matter and chemical change notes(physical & chemical changes)
- 2. Physical Changes Physical Change: When a substance undergoes a physical change, its state may be altered, but its chemical composition is the same
- 4. Physical Changes To identify a physical change: • You can separate the end products (reactants) to original substances. Ex. Salt water, sand & rocks • You are able to re-freeze or melt the product again. Ex. Ice cream
- 5. Chemical Changes Chemical Change: When 2 or more substances react and form 1 or more new substances (The new substances formed are completely different from the original reactants)
- 7. Chemical Changes Four actions that identify a chemical change: 1. Change in color 2. Change of odour (if present)…safety!! 3. Formation of a solid (precipitate) or a gas 4. Release or absorption of energy in the form of light & heat