A gas-phase reaction is carried out at 25 °C and then repeated at 35 °C with all…
CHEMISTRY · Single correct · A Level · Chemistry · Kinetics · Kinetics
Problem
A gas-phase reaction is carried out at 25 °C and then repeated at 35 °C with all other conditions identical.
Which of the following best explains how the increased temperature affects the reaction rate?
(a) The rate increases primarily because the activation energy decreases when the temperature increases.
(b) The rate increases primarily because the collision frequency of reactant molecules increases with temperature, even if their energies stay below the activation energy.
(c) The rate increases primarily because a higher fraction of molecules possess kinetic energy equal to or greater than the activation energy.
(d) The rate increases primarily because the Arrhenius equation k=AeEa/RT shows k to be directly proportional to T, so doubling the temperature roughly doubles the rate.