Answer in brief.
1. Give two examples to show that changescan be observed by their effects.
2. Distinguish between physical and chemical changes
3. Distinguish between a reversible and an irreversible change
4. Define chemical change.
5. Describe the two changes that are seen when a candle burns.
6. Why is the germination of a seed a chemical change?
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Explanation:
3)
reversible:
* it can be reversed under suitable conditions .
* it attains equilibrium.
* it is relatively slow
irreversible:
* it cannot be reversed.
* equilibrium is not attained.
* it is fast.
4)
The transformation of chemical substance into a new chemical substance by making and breaking of bonds between different atoms is know as chemical change (or) chemical reaction.
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