Chemical reactions produce heat energy if:

Energy absorbed by reactants is more than the energy released by products

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Energy absorbed by reactants is less than the energy released by products

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Energy absorbed by reactants is equal to the energy released by products

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All of these

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Solution

The correct option is B Energy absorbed by reactants is less than the energy released by products
Chemical reactions produce heat energy if the energy absorbed by reactants is less than the energy released by-products because the energy that is not absorbed by the reactants is given out as excess heat.

Hence, option B is correct.

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