Question

11. You and your lab partner are studying the rate of a reaction, A + B --> C. You make measurements of the initial rate under the following conditions:

Experiment	[A] (M)	[B] (M)	Rate (M/s)
1	0.7	1.6
2	1.4	1.6

(a) Which of the following reactant concentrations could you use for experiment 3 in order to determine the rate law, assuming that the rate law is of the form, Rate = k [A]^x [B]^y? Choose all correct possibilities.

[A] = 0.7 and [B] = 4.8

[A] = 2.8 and [B] = 1.6

[A] = 2.1 and [B] = 1.6

[A] = 1.4 and [B] = 1.6

[A] = 1.4 and [B] = 4.8

[A] = 3.5 and [B] = 1.6

[A] = 0.7 and [B] = 3.2

[A] = 1.4 and [B] = 3.2

(b) For a reaction of the form, A + B + C --> Products, the following observations are made: tripling the concentration of A increases the rate by a factor of 9, doubling the concentration of B has no effect on the rate, and tripling the concentration of C increases the rate by a factor of 3. Select the correct rate law for this reaction from the choices below.

Rate = k[A][B][C]

Rate = k[A][C]     

Rate = k[A]² [C]

Rate = k[A][C]²

Rate = k[A]² [C]²

Rate = k[A]³ [C]

Rate = k[A][C]³

(c) By what factor will the rate of the reaction described in part (b) above change if the concentrations of A, B, and C are all halved (reduced by a factor of 2)?

The rate will be the original rate multiplied by a factor of ____.

Answer 1