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How to tell if a reaction is exothermic.

Sagot :

Answer:

If the reaction loses heat it is exothermic.

If the enthalpy change listed for a reaction is negative, then that reaction releases heat as it proceeds — the reaction is exothermic (exo- = out). If the enthalpy change listed for the reaction is positive, then that reaction absorbs heat as it proceeds — the reaction is endothermic (endo- = in).