Collision Model

AP Chemistry· difficulty 3/5

Maxwell-Boltzmann curves at two temperatures (T2 > T1) are overlaid; a vertical line marks Ea.

Comparing the Maxwell–Boltzmann distributions at T1 and T2 (T2 > T1), the fraction of molecules with KE > Ea:

A
$Decreases at higher T$
B
$Is greater at T2 than T1$
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C
$Is zero unless catalyst is present$
D
$Is the same at both T$

Explanation

Higher T flattens and broadens the distribution; more molecules have KE > Ea, so reaction rate increases.

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