4. When baking soda is mixed with lemon juice, bubbles are formed
the evolution of a gas. What type of change is it? Explain.
5. When a candle burns, both physical and chemical changes tak
Identify these changes. Give another example of a familiar proc
which both the chemical and physical changes take place.
6. How would you show that setting of curd is a chemical change?
7. Explain why burning of wood and cutting it into small pieces
considered as two different types of changes.
8. Describe how crystals of copper sulphate are prepared.
• 9. Explain how painting of an iron gate prevents it from rusting.
10. Explain why rusting of iron objects is faster in coastal areas than in
deserts.
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Answer: burning of candle and cutting of wood
Explanation:
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