Answer:
it depends on the specific reaction and its activation energy
in some reactions, increasing the heat increases the kinetic energy of the molecules, which increases the force and frequency of their collisions, leading to an increased reaction rate.
in other reactions, increasing the heat can slow or stop the reaction due to the activation energy barrier. the increased temp causes the reactant molecule to vibrate more, resulting in them breaking up or rearranging in a way that is not productive to the reaction. if the reaction is exothermic, increasing the temp can cause the reaction to slow because the heat produced can counteract the effect of the increased temp.