Question

12. Explain in brief the involvement of energy in - physical & chemical changes.
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Answer 1

Answer:

Physical changes use energy to change the state of matter, Chemical changes release or absorb energy when changing a substance into a new substance. Energy is released during the decomposition of a substance while energy is absorbed during the formation of a new substance.

Explanation:

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Answer 2

Explanation:

Physical changes use energy to change the state of matter, Chemical changes release or absorb energy when changing a substance into a new substance. Energy is released during the decomposition of a substance while energy is absorbed during the formation of a new substance.