Introduction
A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more simpler substances. This reaction is often triggered by heat, light, or electricity.

Example of Decomposition Reaction
One example of a decomposition reaction is the breakdown of hydrogen peroxide into water and oxygen gas. The chemical equation for this reaction is:

2 H2O2 → 2 H2O + O2

In this reaction, hydrogen peroxide (H2O2) breaks down into water (H2O) and oxygen gas (O2).

Activity to Illustrate Decomposition Reaction by Heating
To illustrate a decomposition reaction by heating, we can perform an experiment using baking soda (sodium bicarbonate) and vinegar (acetic acid). The chemical equation for this reaction is:

NaHCO3 + CH3COOH → NaCH3COO + H2O + CO2

In this reaction, baking soda (NaHCO3) and vinegar (CH3COOH) react to form sodium acetate (NaCH3COO), water (H2O), and carbon dioxide gas (CO2).

To perform this experiment, we will need:

- Baking soda (sodium bicarbonate)
- Vinegar (acetic acid)
- A clear plastic bottle with a narrow neck (such as a water bottle)
- A balloon
- A funnel

The steps for the experiment are as follows:

1. Using the funnel, add a small amount of baking soda to the plastic bottle.
2. Pour vinegar into the bottle, covering the baking soda.
3. Quickly stretch the opening of the balloon over the neck of the bottle, making sure it is airtight.
4. Tilt the bottle so that the vinegar mixes with the baking soda.
5. Watch as the balloon inflates with carbon dioxide gas, which is produced by the decomposition reaction between the baking soda and vinegar.

Conclusion
In conclusion, a decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more simpler substances. Heating is often used to trigger this reaction. By performing an experiment using baking soda and vinegar, we can illustrate a decomposition reaction and observe the production of carbon dioxide gas.

Take about 2 gram of ferrous sulphate crystals in a dry boiling tube. the ferrous sulphate crystals are green in colour. . the boiling tube over a burner( by keeping the mouth of boiling tube away from yourself and your never working in the laboratory). green colour of ferrous sulphate crystals first changes to White and then brown solid is formed. gas having the smell of burning typhoid comes out of the boiling tube.