SOLVED

31) For a reaction Rate = k[A][B]2, what factor will keep k unchanged? A) raising temperature B) adding inhibitor C) increasing [A] D) adding catalyst 32) In a second order reaction: I)the sum of the exponents in the rate law is equal to two. II)at least one of the exponents in the rate law is a two. III)the half-life is not constant. IV)the half-life is constant. V)k can be expressed as M-2s-1 or M-2min-1. A) I and IV B) II and IV C) I, III, and V D) I and III E) II and III 33) Which of the following is FALSE for a second order reaction? A) 1/[A]t – 1/[A]o = kt. B) t1/2 = 1/k[A]o. C) If 1/[A] versus time is a straight line, the reaction is second order. D) Each successive half-life is 4 times as long as the previous. E) The slope of 1/[A]t versus time is k. 34) For the second order reaction A → products, the following data are obtained: [A] = 3.024 M, t = 0 min [A] = 2.935 M, t = 1.0 min [A] = 2.852 M, t = 2.0 min What is the rate constant, k? A) 3.6 × 10-3 M-1 min-1 B) 1.4 × 10-2 M-1 min-1 C) 2.2 × 10-2 M-1 min-1 D) 9.7 × 10-3 M-1 min-1 E) 1.0 × 10-2 M-1 min-1 35) For the second order reaction A → products, the following data are obtained: [A] = 1.512 M, t = 0 min [A] = 1.490 M, t = 1.0 min [A] = 1.469 M, t = 2.0 min What is the rate constant, k, for the reaction? A) 3.6 × 10-3 M-1 min-1 B) 1.4 × 10-2 M-1 min-1 C) 2.2 × 10-2 M-1 min-1 D) 1.0 × 10-2 M-1 min-1 E) 9.7 × 10-3 M-1 min-1 36) Activation energy is: A) energy at the bottom of the reaction curve B) the heat energy in Joules required to break the bonds in one reactant C) an energy that a catalyst brings to the system to activate one of the reactants D) the kinetic energy of solution stirring that brings the reaction to start E) minimum kinetic energy that molecules must bring to their collisions for a chemical reaction to occur 37) Choose the INCORRECT answer. The rate of a chemical reaction: A) usually is increased when the concentration of one of the reactants is increased B) is dependent on temperature C) may be increased by certain catalytic agents D) will be very rapid if the activation energy is large E) describes the change in concentration of a reactant or product with time 38) Which of the following has no effect on the rate of a reaction? A) value of ΔH° B) activation energy C) presence of a catalyst D) temperature of reactants E) concentrations of reactants 39) Which of the following statements is correct? A) A zero order reaction depends on the concentration of reactants. B) A reaction rate cannot be calculated from the collision frequency alone. C) The activated complex is a chemical species that can be isolated and analysed. D) The number of collisions has no effect on the rate constant. E) The orientation of a collision does not affect the rate constant. 40) Choose the INCORRECT statement. A) A reaction intermediate is produced and used up during the reaction. B) A transition state and a reaction intermediate are the same. C) An activated complex has partially formed bonds. D) A reaction intermediates have fully formed bonds. E) The rate-determining step is the slow-step.