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Questions and Answers
What type of changes affect the form of a chemical substance but not its chemical composition?
What type of changes affect the form of a chemical substance but not its chemical composition?
- Environmental changes
- Biological changes
- Chemical changes
- Physical changes (correct)
Which type of change involves the formation of new substances?
Which type of change involves the formation of new substances?
- Thermal change
- Physical change
- Mechanical change
- Chemical change (correct)
What is an example of a reversible change using physical means?
What is an example of a reversible change using physical means?
- Rusting of iron
- Digestion of food
- Evaporation of salt from water (correct)
- Burning of wood
Which property does not typically change in a physical change?
Which property does not typically change in a physical change?
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What are examples of physical properties that can change during a physical change?
What are examples of physical properties that can change during a physical change?
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Study Notes
Changes in Chemical Substances
- Physical changes affect the form of a chemical substance but not its chemical composition.
- Chemical changes involve the formation of new substances.
Properties of Physical Changes
- Chemical composition typically remains the same in a physical change.
- Examples of physical properties that can change during a physical change include:
- State (solid, liquid, gas)
- Shape
- Size
- Texture
Reversible Changes
- Melting of ice is an example of a reversible change using physical means (heating/cooldown).
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