If a large amount of heat was released at the start of the reaction, then it will decrease.
With increase in temperature, the rate of the reaction and the rate constant increases.
As a generalization, the rate of the reaction (and the rate constant) becomes almost double for every ten degree rise in temperature. This is also called temperature coefficient.
An increase in temperature typically increases the rate of reaction.
An increase in temperature will raise the average kinetic energy of the reactant molecules.
Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision.
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