Question

1. Write down one chemical equation in which gas evolves

2. Write down one chemical equation in which heat evolves

3.Write down one chemical equation in which heat is absorbed

4. Write down one chemical equation in which sunlight is essential.

5. Write down one chemical equation in which colour is changed​

Answer 1

Answer:

1.Evolution of a gas.

2.Change in colour.

3.Formation of a precipitate.

4.Change in temperature.

5. a chemical reaction mainly there will be two sides, one is reactant.

Answer 2

Answer:

1.zinc reacts with hydrochloric acid, hydrogen gas is evolved with formation of zinc chloride.

2.a chemical reaction in which one of the end products is a gas such as oxygen or carbon dioxide.

3.The transformation of chemical substance into another chemical substance

4.combination, decomposition, single-replacement, double-replacement, and combustion.

5.representation of chemical reaction.