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What is a chemical change? Explain with example.
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.
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