DISCUSS the effect of temperature on the rate of a reaction. Derive necessary equain this context.
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When the temperature increases, the fraction of molecules that have kinetic energies more than the activation energy of the reaction increases. Therefore, the total activation energy of the reaction decreases. Thus, the rate of the reaction increases.
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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. It is the ratio of rate constants of the reaction at two temperatures differing by ten degree. Thus,
temperature coefficient =
Rate constant at T
o
C
Rate constant at (T+10)
o
C
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