alleryStart learning →What does the frequency factor A in the Arrhenius equation describe?
AThe fraction of collisions with enough energy
BThe rate of collisions with correct orientation
CThe energy barrier that must be overcome
DThe temperature at which the reaction runs
Answer & Solution
Correct answer: B. The rate of collisions with correct orientation
1. The Arrhenius equation holds two separate pieces of collision theory.
2. The frequency factor A carries the collision rate and the orientation requirement.
3. The exponential term carries the energy requirement instead.
4. So A is about how often correctly aimed collisions happen.
5. Anything that increases the number of well aimed collisions raises A and therefore raises k.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 12 "Kinetics", section 12.5 Collision Theory_
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