Question

Give reasons why the following are considered as chemical changes.
1. Copper carbonate on heat gives copper oxide and carbon dioxide.
2. A bright light is seen evolved when a strip of magnesium is heated
3. Sulphur when burnt in air evolves a gaseous acidic product.
4. An iron nail kept open in the atmosphere rusts.​

Answer 1

Answer:

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Explanation:

Answer 2

Answer:

1) because new products are formed

2) because of emmision of light

3) because new products are formed

4) because a new substance is formed

5) because composition is altered

These are the reasons