At 800 K, the equilibrium constant for the reaction A₂(g) ⇌ 2A(g) is K_c = 3.1 x 10^-4. 

(a) Assuming both forward and reverse reactions are elementary reactions, which rate constant do you expect to be larger, k_f or k_r? 

(b) If the value of k_f = 0.27 s^-1, what is the value of k_r at 800 K? 

(c) Based on the nature of the reaction, do you expect the forward reaction to be endothermic or exothermic? 

(d) If the temperature is raised to 1000 K, will the reverse rate constant k_r increase or decrease? Will the change in k_r be larger or smaller than the change in k_f ?