5.
- The addition of a catalyst to a reaction
(A) changes the enthalpy
(B) changes the entropy
(C) changes the nature of the products
(D) changes the activation energy
- An increase in concentration
(A) is related to the number of collisions directly
(B) is related to the number of collisions inversely
(C) has no effect on the number of collisions
- At the beginning of a reaction, the reaction rate for the reactants is
(A) largest, then decreasing
(B) largest and remains constant
(C) smallest, then increasing
(D) smallest and remains constant
- The reaction rate law applied to the reaction aA + bB → AB gives the
expression
(A) rate = [A]b[B]a
(B) rate = [AB]a[A]b
(C) rate = [B]a[AB]b
(D) rate = [A]a[B]b
