Reaction Kinetics -- Chemistry Multiple Choice Questions please help! #'s 1,2,3,5?

Question

1)If 2A + B --> C is a one–step reaction, the rate expression is

(A) rate = k[C]

(B) rate = k[A]^2

(C) rate = k[A] [B]

(D) rate = k[A]^2[B]


2) A reaction mechanism has several steps. The rate of the overall reaction is equal to

(A) the rate of the fastest step.

(B) the rate of the slowest step.

(C) the average of the rates of the steps.

(D) the difference between the rate of the fastest step and the rate of the slowest step.


3) Generally an increase of ten degrees Celsius doubles the rate of reaction between gases. What is the explanation for this increase in reaction rate?

(A) The pressure is doubled.

(B) The concentration of the reactants is doubled.

(C) The average kinetic energy of the molecules is doubled.

(D) The number of intermolecuiar collisions per unit of time is doubled.

(E) The number of particles with an energy above a minimum activation energy is doubled.

5) X and Y react together. For a three-fold increase in the concentration of X there is a nine-fold increase in the rate of the reaction. This shows that the order with respect to X is

a) 0

b) 1

c) 2

d) 3

Answer 1

1. D
2. B
3. D
5. C