Question

Chemical changes are accompanied by absorption and evolution of...... ​

Answer 1

Answer:

These reactions are accompanied with absorption of heat. These reactions are accompanied with evolution of heat. Melting of solids, fusion, evaporation and vaporisation are examples of endothermic reaction. Combustion of petrol and oxidation of ammonia are examples of exothermic reaction.

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Answer 2

Answer:

These reactions are accompanied with evolution of heat. Melting of solids, fusion, evaporation and vaporisation are examples of endothermic reaction. Combustion of petrol and oxidation of ammonia are examples of exothermic reaction.

Explanation:

Heat