Physical Or Chemical Change Qz
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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.
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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.
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.
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.
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.
Properties and Changes
This document discusses physical and chemical properties of matter. It defines physical properties as those that can be observed without changing the identity of the substance, such as color, shape, and size. Chemical properties involve changes in which new substances are formed, such as flammability and reactivity. Examples of physical changes provided are melting, freezing, and breaking, which do not form new substances. Chemical changes, like burning and digestion, result in different final products. The document also discusses density, states of matter, and distinguishing between physical and chemical changes.
Changes in matter.pptx 20013 2014
This document discusses physical and chemical changes in matter. It provides examples of physical changes such as melting, freezing, evaporation and condensation. Chemical changes result in new substances forming, like rusting, burning, and cooking. The key questions are how matter changes and the importance of understanding matter's properties and types. The objectives are to analyze how matter changes physically and chemically, and demonstrate ways matter undergoes property changes.
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.
Reactions
This document discusses physical and chemical changes. It defines physical changes as temporary and reversible, with no new substances formed. Examples given are folding paper, drying clothes, and freezing water. Chemical changes are defined as permanent, irreversible changes that produce new substances. Examples provided are rusting iron, burning wood, and digestion of food. The document then explains that chemical changes involve reactants forming products, and lists conditions like physical contact, solution, heat, and catalysts that can induce chemical reactions.
HUDA PPT 3.pptx
This document discusses the differences between physical and chemical changes of matter. It defines physical changes as changes in shape, size, or state that do not alter the chemical makeup of a substance. Chemical changes occur when substances combine to form new substances with different chemical properties. The learning objectives are to identify physical and chemical changes and compare their key differences.
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.
Changes in matter.pptx 20013 2014
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. Examples of physical changes discussed include tearing paper, molding clay, and folding a handkerchief. Chemical changes discussed include rusting iron, souring milk, and ripening fruits. A physical change alters the appearance of matter but does not change its chemical composition, while a chemical change produces new substances. The document seeks to demonstrate the difference between physical and chemical changes in various examples and situations.
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.
Visual aid for
A physical change is a change in which no new substances are formed and the physical properties remain the same, making most physical changes reversible. Examples of physical changes include changes of state, such as water changing between liquid, solid, and gas forms, as well as changes in density or shape. A chemical change involves a chemical reaction that produces new chemical substances and is typically irreversible.
1/11/12
A physical change alters a substance's physical properties but not its chemical identity, while a chemical change transforms a substance into different substances through breaking or forming of chemical bonds. Changes in color, mass, or release of gases indicate a chemical change has occurred, whereas changes in state or phase without a new substance forming signal a physical change. Students can identify if a change is physical or chemical based on observable evidence like changes in properties or formation of new substances.
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Physical or-chemical-change-qz3371-091221214759-phpapp01
Physical or-chemical-change-qz3371-091221214759-phpapp01
Changes in matter.pptx 20013 2014 ( Physical and chemical change)
Changes in matter.pptx 20013 2014 ( Physical and chemical change)
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Scientific Notation Pp
This document discusses scientific notation and its rules. Scientific notation is used to write very large or very small numbers in a simpler way by moving the decimal point and using an exponent. There are four rules: 1) only the zeros after the first digit are replaced by an exponent, 2) there is one non-zero number before the decimal, 3) a negative exponent is used when moving the decimal right, and 4) a positive exponent is used when moving the decimal left.
States
There are three common states of matter: solids, liquids, and gases. Solids have a definite shape and volume, liquids have a definite volume but take the shape of their container, and gases have no definite shape or volume. Additionally, there are two less common states: plasma and Bose-Einstein condensate. Plasma is the state of matter that makes up 99% of the visible universe and occurs at extremely high temperatures. Bose-Einstein condensate is a fifth state of matter that occurs at very low temperatures, near absolute zero, where groups of atoms behave as a single particle.
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The document discusses Boyle's law and Charles's law, two scientific laws relating the properties of gases. [1] Boyle's law states that the pressure and volume of a gas are inversely proportional, meaning that if volume decreases, pressure increases and vice versa. [2] Charles's law specifies that the volume of a gas increases as temperature increases if pressure remains constant. [3] Both laws are expressed through mathematical equations relating the gas properties of pressure, volume, temperature, and number of particles.
Chapter 1
The document outlines several key scientific concepts:
1) The scientific method is a standardized approach used by scientists involving making observations, forming hypotheses, conducting experiments, analyzing results, and publishing conclusions.
2) Scientific notation is a way to write very large or small numbers using powers of ten. It involves moving the decimal and multiplying by a power of ten.
3) Significant figures refer to the number of digits known with certainty in a measurement, which determines the precision of calculations.
Magnetism
1) Earth itself acts like a giant magnet with a north and south pole that generates a magnetic field extending 50,000 miles into space, allowing compasses to function by pointing towards Earth's magnetic north pole.
2) A compass needle is magnetic and orients itself towards the north-seeking pole of Earth's magnetic field, though it may be affected inside steel buildings or ships due to magnetic attraction between the needle and nearby steel.
3) Magnetic fields surround all magnets and are represented by magnetic lines of force showing the direction and strength of the magnetic force, with lines closest together at the poles where the force is strongest.
Motion
Motion requires a frame of reference, which is a system of objects that are not moving with respect to each other, to describe how objects are moving. Distance is the length of a path between two points and is measured in meters. Relative motion describes movement in relation to a frame of reference, such as people on a train platform observing the motion of a passing train relative to themselves.
Force & Motion 3
Mass is a measure of an object's inertia based on the amount of matter it contains. Weight is the force of gravity acting on an object, and can be calculated as the product of an object's mass and the acceleration due to gravity. Newton's third law states that for every action there is an equal and opposite reaction - whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
Energy
There are two main types of energy: renewable and nonrenewable. Renewable energy sources include solar, hydroelectric, geothermal, wind, biomass, hydrogen fuel cells, and potentially nuclear fusion in the future. Nonrenewable sources are limited and cannot be easily replaced, such as oil, natural gas, coal, and uranium. Coal has historically been the most exploited nonrenewable resource.
Force & Motion 2
There are four main types of friction that oppose the motion of objects in contact: static, sliding, rolling, and fluid friction. Static friction acts on non-moving objects while sliding friction opposes the direction of motion for objects sliding over a surface. Rolling friction impacts rolling objects and fluid friction counters the motion of objects through liquids and gases. Gravity is a downward force between masses, causing falling objects to accelerate downwards while air resistance reduces this acceleration in the direction of motion.
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Physical Or Chemical Change Qz
- 1. Chemical Properties & Physical and Chemical Changes
- 2. Physical changes are those changes that do not result in the production of a new substance. If you melt a block of ice, you still have H 2 O at the end of the change.
- 3. If you break a bottle, you still have glass. Painting your nails will not stop them from being fingernails. Some common examples of physical changes are: melting, freezing, condensing, breaking, crushing, cutting, and bending.
- 4. Some, but not all physical changes can be reversed. You could refreeze the water into ice, but you cannot put your hair back together if you don’t like your haircut!
- 5. Special types of physical changes where any object changes state, such as when water freezes or evaporates, are sometimes called change of state operations .
- 6. CHEMICAL PROPERTIES Chemical properties can ONLY be observed AS the substances are changing into different substances.
- 7. Chemical changes , or chemical reactions, are changes that result in the production of another substance.
- 8. FLAMMABILITY: A material’s ability to BURN in the presence of OXYGEN
- 9. REACTIVITY: How readily (easily) a substance combines chemically with other substances.
- 10. Which has higher reactivity? A 14 karat gold ring or a cheap metal ring from the vending machine at the grocery store? What is your evidence?
- 11. Recognizing Chemical Changes: Please read 56-57 in your book and take notes on the 3 types of chemical change.
- 12. When you burn a log in a fireplace, you are carrying out a chemical reaction that releases carbon. When you light your Bunsen burner in lab, you are carrying out a chemical reaction that produces water and carbon dioxide.
- 13. Common examples of chemical changes that you may be somewhat familiar with are; digestion, respiration, photosynthesis, burning, and decomposition.