A reaction follows rate = k[A]^2[B]. The mixture is warmed, with all concentrations held fixed. Which part of the rate law changes?

Core Concept

Raising the temperature redistributes molecular energies so a larger fraction of collisions clears the activation barrier, which raises the rate constant. The exponents describing how rate responds to concentration are fixed features of the underlying mechanism and do not shift with temperature. Concentrations were held constant by assumption. The entire effect of warming therefore flows through k alone.