What is a chemical change? Explain with example.

The changes in which new substances with new chemical properties are formed are called chemical changes.
Example: Reaction between washing soda and lemon juice in which C02 and other substances are formed.

During a chemical reaction, the chemical bonds between the molecules are broken and rearranged, and new bonds are formed resulting in the formation of new compounds.

For example, a photosynthesis reaction is a chemical change as carbon dioxide and water in the presence of sunlight and chlorophyll to give sugar molecules and oxygen as a product. Here, sugar once formed cannot be converted back to carbon dioxide and water easily. As a new compound is formed from the reaction between water and carbon dioxide, it is a chemical change.

Other Examples: Digestion of food, burning of petrol and diesel, rusting, preparation of tea and coffee, etc.

Properties of chemical change are as follows:

1. Chemical changes are irreversible. The original form of the matter cannot be attained.

2. It is a permanent change and one or more new substance is formed.

3. During a chemical change, energy is produced in the form of heat, light or sound.

4. Chemical change causes changes in the physical and chemical properties of the substance.


Simply Easy Learning

Updated on: 10-Oct-2022


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