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Mind Maps: Physical and Chemical Changes | Science Class 7

The document Mind Maps: Physical and Chemical Changes | Science Class 7 is a part of the Class 7 Course Science Class 7.
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FAQs on Mind Maps: Physical and Chemical Changes - Science Class 7

1. What are some examples of physical changes?
Ans. Physical changes are changes that affect the form of a chemical substance but not its chemical composition. Examples include melting ice, boiling water, and dissolving sugar in water.
2. How can you differentiate between a physical and chemical change?
Ans. Physical changes involve a change in the form of a substance without changing its chemical composition, while chemical changes result in the formation of new substances with different chemical compositions.
3. What are some examples of chemical changes?
Ans. Chemical changes involve the formation of new substances with different chemical compositions. Examples include burning wood, rusting of iron, and baking a cake.
4. Is cutting paper a physical or chemical change?
Ans. Cutting paper is considered a physical change because it only affects the form of the paper without changing its chemical composition.
5. How can you reverse a physical change?
Ans. Physical changes can often be reversed by applying the opposite conditions that caused the change. For example, melting ice can be reversed by freezing the water again.
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