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Moderate

Temperature Dependence of the Rate Constant

APCHEM-4EK6GT

The proportionality constant, $k$, used in rate laws is exponentially dependent on temperature.

Which of the following BEST explains the reason for this dependence on temperature?

Hint: $k = A e^{\frac {-E_a}{RT}}$

A

As $T$ increases, reacting molecules decrease their average kinetic energy, resulting in fewer collisions, and the rate constant decreases.

B

As $T$ increases, reacting molecules increase their average kinetic energy, resulting in more collisions, and the rate constant increases.

C

As $T$ increases, the kinetic energy increases, resulting in more effective collisions between reacting molecules, and the rate constant increases.

D

As $T$ increases, the orientation requirements (shown by the variable $A$) for the reaction become less critical, $A$ increases, and the rate constant increases.