7. Energy is ------
in chemical changes.
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In physics, energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object.
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Explanation:
The energy change, in a chemical reaction is, due to the difference in the amt of stored chemical energy, btwn the products and the reactants.This stored chemical energy or heat content, of the system is known as enthalpyyy........
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