Answer: e -Ea/RT.
- A e<sup>-Ea/RT</sup>
- B e<sup>Ea/RT</sup>
- C Ea/RT
- D RT/Ea
Correct answer: A. e<sup>-Ea/RT</sup>
Explanation: The Boltzmann factor e<sup>-Ea/RT</sup> gives the fraction of colliding molecules with energy at least equal to the activation energy Ea.
First-order decay curve: concentration halves every t½, and that half-life is constant - a defining test for first-order kinetics.
Concept context
Study the speed of reactions and what affects it: concentration, temperature, and catalysts. Covers rate law, order of reaction, the Arrhenius equation, and reaction mechanisms step by step.