Question

2.3 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. 5. A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid​

Answer 1

Answer:

The tourism industry can bring valuable income to the country. Write a letter to the Editor of a popular daily on how the government and the public can boost the development of this industry. You are Rama/Ram, 4 Rani Road, Ranchi.

Answer 2

Solution: Copper carbonate is green colored which gives copper oxide and carbon dioxide, which are new substances with new properties. This reaction is irreversible, hence it’s a chemical change.