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heat will be absorbed and the products will be formed faster exothermic reaction will undergo spontaneously as it does not require any energy while endothermic reaction has to be supplied with energy to happen therefore exothermic reaction will be faster than endothermic reaction
1 Temperature change: Exothermic is an increase in the speed of the molecules (heat). Exothermic is the taking in of energy. 2  Color change: the increase or decrease of potential energy stored in new bonds.  Precipitate formed: increase or decrease of potential energy in new bonds formed.