Question

2.
C. Short answer questions
1. What are reversible changes? Give two examples.
Name three physical states of water. How can you convert the liqui
solid state?
3. What are irreversible changes? Give two examples.
4. Why is burning of paper an irreversible change?
What are physical changes? Give two examples.
6. What are chemical changes? Give two examples.
What is the effect of heating and cooling on some materials?
D. Long answer questions
5.
7.
1. Explain why melting of butter is reversible, whereas curdling of m
2. Explain why tearing of paper is a physical change, whereas burnin
change.
3. Give an example of expansion each in solid, liquid, and gas.
4. Give an example of contraction each in solid, liquid, and gas,​

Answer 1

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Answer 2

Answer:

Examples of reversible reactions include dissolving, evaporation, melting and freezing.

Three physical states of water are solid , liquid and gas. Solid can be changed into liquid by melting. Liquid into gas by evaporation. Liquid on into solid by freezing.