Podcast
Questions and Answers
Classify the condensation of steam:
Classify the condensation of steam:
- Both
- Physical (correct)
- Neither
- Chemical
Classify the burning of gasoline:
Classify the burning of gasoline:
- Physical
- Both
- Neither
- Chemical (correct)
Classify the souring of milk:
Classify the souring of milk:
- Chemical (correct)
- Neither
- Both
- Physical
Classify the dissolving of sugar in water:
Classify the dissolving of sugar in water:
Classify the melting of gold:
Classify the melting of gold:
Is the change in volume of a sample of oxygen gas from 10 mL to 11 mL a chemical or physical change?
Is the change in volume of a sample of oxygen gas from 10 mL to 11 mL a chemical or physical change?
What is the difference between extensive properties and intensive properties?
What is the difference between extensive properties and intensive properties?
Why is density an intensive property?
Why is density an intensive property?
Define chemical change.
Define chemical change.
Define chemical property.
Define chemical property.
Define extensive property.
Define extensive property.
Define intensive property.
Define intensive property.
Define physical change.
Define physical change.
Define physical property.
Define physical property.
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Study Notes
Changes in Matter
- Changes can be classified as either physical or chemical.
- Physical Changes: Do not alter the chemical composition of a substance.
- Examples: condensation of steam, dissolving sugar in water, melting of gold.
- Chemical Changes: Result in the formation of new substances.
- Examples: burning of gasoline, souring of milk.
Volume and Changes
- Changes in gas volume, like oxygen gas changing from 10 mL to 11 mL, signify a physical change, not a chemical one.
Properties of Matter
- Extensive Properties: Depend on the amount of substance present.
- Example: mass and volume.
- Intensive Properties: Remain constant regardless of the amount of substance.
- Example: density, defined as mass divided by volume.
Density as an Intensive Property
- Density is an intensive property because it is a ratio (mass/volume) of two extensive properties.
- The ratio cancels the dependence on the amount, yielding a constant value for density.
Definitions of Changes and Properties
- Chemical Change: Produces a different kind of matter from the original.
- Chemical Property: Describes how a substance can change into different matter.
- Extensive Property: A characteristic that varies with the amount of substance.
- Intensive Property: A characteristic that does not change with the amount of substance.
- Physical Change: Alters the state or properties of matter without changing its chemical composition.
- Physical Property: A characteristic that doesn't involve a change in the chemical composition.
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