Chemical properties
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Chemical properties describe how a substance reacts or changes during a chemical reaction. Some key chemical properties include flammability, reactivity, and the ability to undergo chemical changes that alter the composition of the substance. Common signs that a chemical change has occurred include a change in color, production of a gas, or formation of a precipitate. However, physical changes can sometimes exhibit similar signs, so the only definitive way to identify a chemical change is if the composition of the substance changes to form new substances.
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The lesson plan discusses physical and chemical changes of matter. The objectives are for students to distinguish between physical and chemical changes, cite applications of these concepts, and provide examples of each. The lesson involves reviewing matter, demonstrating examples, discussing the concepts, having students do an activity distinguishing examples, and evaluating their understanding. The key points are that physical changes alter observable properties but not molecular composition, while chemical changes result in new substances through molecular rearrangements.
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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 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.
Phys chem science speech 1
This document distinguishes between physical and chemical changes. It defines a physical change as a change in physical properties like shape, size or color, but not the underlying chemical makeup. A chemical change occurs when new substances are formed. Examples given include sugar dissolving in tea (chemical change) and logs burning or water separating into hydrogen and oxygen (chemical changes that create new materials).
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.
CHEMISTRY, ELEMENTS AND COMPOUNDS
An element is the simplest form of matter that has unique properties and includes all substances on the periodic table, while a compound contains two or more elements bonded together and can be broken down into simpler substances through chemical means. Compounds have different properties from their constituent elements, as sodium is an explosive metal, chlorine is toxic gas, but together they form the compound sodium chloride, which is table salt. Chemical changes involve the formation or breakdown of compounds through chemical reactions that conserve mass according to the law of conservation of mass.
Topic 1
Chemical and physical changes can be distinguished based on whether changes occur at the molecular level or involve energy and states of matter. Physical changes alter the shape or state of matter of a substance without changing its chemical composition, such as crushing a can or melting ice. Chemical changes involve transformations of molecular structure and composition through breaking and forming of chemical bonds, such as rusting of iron or burning of sugar. While some changes are obvious, others occur at the microscopic level of molecular structure and bonding.
Changesinmatter66th
Matter is anything that takes up space in the universe. It has general properties like mass and volume, and specific properties like color and density. There are two types of changes in matter: physical changes, which do not change the mass or type of matter, like changes in shape or state; and chemical changes, which produce new substances when two or more react. Pure substances are made of one type of matter, while mixtures contain different types that can sometimes be separated.
Properties of matter
There are two types of changes that matter can undergo: physical changes and chemical changes. Physical changes alter the physical properties of a substance without changing its chemical identity, such as ice melting or a metal being bent. Chemical changes occur when new substances are formed with different chemical properties than the original substances, like a log burning or food being digested. Some signs that a chemical change has taken place include a color change, gas production, energy release or absorption, light or sound production, or formation of a precipitate. Chemical changes form entirely new substances and are generally not reversible.
Basic Chemistry.ppt
Chemistry is the study of substances and their composition, structure, properties, and reactions. Chemical reactions occur all around us in many everyday processes from starting a car to digesting food. Organic chemistry is the study of carbon compounds, which are found in materials like plastics and polymers as well as living things like DNA and foods. Chemical and physical changes can be distinguished based on whether the identity of a substance changes, with chemical changes occurring at the molecular level to form new substances. Acids and bases are found throughout the body and in many other natural and industrial processes.
BEd SCIENCE FILE COMPLETE FULL TOPIC OF CLASS 8TH
Physical changes alter a substance's physical properties like state, color, or odor without changing its chemical makeup. Examples include melting ice and blowing up a balloon. Chemical changes create new substances through irreversible reactions, such as ripening fruit that transforms its chemical structure. The document aims to differentiate and provide examples of physical and chemical changes.
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.
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.
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.
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.
Chapter 12 Lesssons
The document summarizes key concepts from Chapter 12 on changes in matter. It discusses physical and chemical changes, types of chemical reactions including decomposition, combination, and replacement. It also describes how chemical properties can be used to separate mixtures and identify substances. Finally, it gives examples of how chemistry is applied in health, materials, transportation, and technology to improve lives.
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.
States of Matter
The document discusses the kinetic molecular theory and states of matter. It introduces the four basic states of matter - solids, liquids, gases, and plasma - and describes their characteristic properties like shape, volume, and particle motion. It also discusses the classification of matter into pure substances and mixtures, and defines properties as either intensive or extensive, and changes as either physical or chemical.
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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
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Phase changes
The document discusses the different phases of matter (solid, liquid, gas) and the phase changes between them. When energy is added to a solid, its bonds break and it melts into a liquid where particles can move freely. Adding more energy turns the liquid into a gas where particles move randomly. The phase changes - melting/freezing, vaporization/condensation, sublimation/deposition - describe the changes in particle arrangement that occur when energy is added or removed. Phase changes are classified as endothermic, where energy is absorbed during the change, or exothermic, where energy is released.
Presenting scientific data graphing
This document discusses different types of graphs used to present scientific data:
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The document provides examples of different graphs and how to interpret the relationships between variables displayed in each type of graph.
Ocean acidification will-the_reef_survive-non-narrated[1]
The burning of fossil fuels releases 11 billion tons of carbon dioxide into the atmosphere each year, which dissolves into the ocean and causes ocean acidification. Ocean acidification threatens shell-forming organisms as a small pH change equals a large acidity change, reducing the concentration of carbonate ions needed by corals and plankton for shell formation. Experiments show yeast producing carbon dioxide that dissolves in water, lowering the pH and demonstrating how ocean acidification occurs.
Ocean acidification will-the_reef_survive-non-narrated[1]
The burning of fossil fuels releases 11 billion tons of carbon dioxide into the atmosphere each year, which dissolves into the ocean and causes ocean acidification. Ocean acidification threatens shell-forming organisms as a small pH change equals a large acidity change, reducing the concentration of carbonate ions needed by corals and plankton for shell formation. Experiments show yeast producing carbon dioxide that dissolves in water, lowering the pH and demonstrating how ocean acidification occurs.
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Chemical equations
The document discusses chemical equations and balancing reactions. It provides examples of chemical equations showing the formation of glucose from carbon dioxide and water during photosynthesis, the formation of carbon dioxide from carbon and oxygen, and the formation of water from hydrogen and oxygen. It also discusses the law of conservation of mass, which states that the total mass of reactants must equal the total mass of products in a chemical reaction.
Bonding
The document discusses valence electrons and bonding. It introduces the 2-8-8 rule which states that the first energy level can hold up to 2 electrons, and the second and third levels can each hold up to 8 electrons. Atoms are stable once their energy levels are filled. Ionic bonds form when a metal atom transfers electrons to a nonmetal, becoming cations and anions. Covalent bonds form when atoms share electrons rather than transfer them. Metallic bonds form a "sea" of delocalized electrons between positively charged metal ions.
Periodic Table
The periodic table organizes the chemical elements in an orderly fashion according to their atomic structure. It arranges elements in rows and columns, with elements in the same column having similar properties because they have the same number of valence electrons. The periodic table is useful to chemists because it allows them to predict how elements will react and form bonds based on their position in the table.
Atomos[1]
The document traces the development of atomic theory over time from ancient Greek philosophers to modern models. It describes Democritus' idea that matter is made of indivisible particles called "atomos", Dalton's atomic theory of elements composed of atoms, J.J. Thomson's "plum pudding" model showing atoms contain smaller particles, Rutherford's gold foil experiment proving atoms have a small, dense nucleus, Bohr's model of electrons in specific energy levels orbiting the nucleus, and the modern wave model showing electrons as probability clouds rather than definite orbits.
Atomos
The document traces the development of atomic theory over time from ancient Greek philosophers to modern models. It describes Democritus' idea that matter is made of indivisible particles called "atomos", Dalton's model of atoms as indivisible spheres, Thomson's "plum pudding" model with electrons scattered in a positively charged substance, Rutherford's gold foil experiment showing atoms are mostly empty space with a dense nucleus, Bohr's model of electrons in specific energy levels orbiting the nucleus like planets, and the modern wave model where electrons exist as probability clouds rather than definite orbits.
Atomos[1]
The document traces the development of atomic theory over time from ancient Greek philosophers to modern models. It describes Democritus' idea that matter is made of indivisible particles called "atomos", Dalton's atomic theory of elements composed of atoms, J.J. Thomson's "plum pudding" model showing atoms contain smaller particles, Rutherford's gold foil experiment proving atoms have a small, dense nucleus, Bohr's model of electrons in specific energy levels orbiting the nucleus, and the modern wave model showing electrons as probability clouds rather than definite orbits.
Atomos[1]
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The periodic table
The document discusses the organization and classification of elements in the periodic table. It describes how Mendeleev organized the elements based on increasing atomic mass and similar properties. The modern periodic table is organized by increasing atomic number. Elements are classified into metals, nonmetals, and metalloids, which are grouped based on their location on the periodic table. Each group of elements has a characteristic number of valence electrons that determine their chemical properties.
Chemical properties
Chemical properties describe how a substance reacts or changes during a chemical reaction. Some key chemical properties include flammability, reactivity, and the ability to change composition. There are several clues that indicate a chemical change rather than a physical change has occurred, such as a change in color, production of a gas, or formation of a precipitate. However, not all instances of these clues necessarily mean a chemical reaction took place, and the definitive test is whether the composition of the matter changes to produce different substances.
Chemical properties
Chemical properties describe how a substance reacts or changes during a chemical reaction. Some key chemical properties include flammability, reactivity, and the ability to undergo chemical changes that alter the composition of the substance. Common signs that a chemical change has occurred include a change in color, production of a gas, or formation of a precipitate. However, physical changes can sometimes exhibit similar signs, so to determine if a chemical change took place, one must ask if different substances are present after the change.
Chemical properties
Chemical properties describe how a substance reacts or changes during a chemical reaction. Some key chemical properties include flammability, which is the ability to burn; reactivity, how easily a substance combines with another; and changes in color, production of gas, or formation of precipitates, which can indicate a chemical change has occurred. A chemical change results in different substances being present after the reaction, while a physical change does not alter the composition of the matter.
Chemical properties
Chemical properties describe how a substance reacts or changes during a chemical reaction. Some key chemical properties include flammability, reactivity, and the ability to undergo chemical changes that alter the composition of the substance. Common signs that a chemical change has occurred include a change in color, production of a gas, or formation of a precipitate. However, physical changes can sometimes exhibit similar signs, so the defining feature of a chemical change is that it produces one or more new substances.
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