why do heat changes occur in chemical reactions ?

Asked by sandeepb | 20th Sep, 2010, 03:39: PM

Expert Answer:

Chemical energy is part of all chemical reactions. Energy is needed to break chemical bonds in the starting substances. As new bonds form in the final substances, energy is released. By comparing the chemical energy of the original substances with the chemical energy of the final substances, you can decide if energy is released or absorbed in the overall reaction.

Answered by  | 20th Sep, 2010, 04:41: PM

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