Explain why burning of wood and cutting it into small pieces are consi

1.	Explain why burning of wood and cutting it into small pieces are considered as two different types of changes. Describe how crystals of copper sulphate are prepared.
Answer» Burning of wood is a chemical change because during burning new substances are formed and we cannot get back the original substance(wood) back. Cutting of wood into small pieces is a physical change because no new substances are formed. Crystals of copper sulphate are prepared in the following way: 1. Take a cup full of water in a beaker. 2. Add few drops of dilute sulphuric acid. 3. Heat the water. 4. On boiling add copper sulphate powder slowly and stir continuously. 5. Continue adding copper sulphate powder till the solution becomes saturated. 6. Filter the solution and allow it to cool. 7. The solution should be kept undisturbed. 8. Slowly the copper sulphate crystals separate out.

Explain why burning of wood and cutting it into small pieces are considered as two different types of changes. Describe how crystals of copper sulphate are prepared.

Answer»

Burning of wood is a chemical change because during burning new substances are formed and we cannot get back the original substance(wood) back. Cutting of wood into small pieces is a physical change because no new substances are formed.

Crystals of copper sulphate are prepared in the following way:

1. Take a cup full of water in a beaker.

2. Add few drops of dilute sulphuric acid.

3. Heat the water.

4. On boiling add copper sulphate powder slowly and stir continuously.

5. Continue adding copper sulphate powder till the solution becomes saturated.

6. Filter the solution and allow it to cool.

7. The solution should be kept undisturbed.

8. Slowly the copper sulphate crystals separate out.

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