Chapter 15, Problem 105AE

(a)

Interpretation Introduction

Interpretation:

The first order rate constants for the thermal degradation of silk for each of the three experiments should be calculated.

Concept Introduction:

Integrated rate law for first order reactions

  $\ln {\left[\text{A}\right]}_t=\ln {\left[\text{A}\right]}_0-kt$

[A]_t − concentration of A at time t

[A]₀ − initial concentration of A

k − rate constant

t − time

(b)

Interpretation Introduction

Interpretation:

Whether the two additives appear to retard the degradation of silk should be discussed.

Concept Introduction:

Integrated rate law for first order reactions

  $\ln {\left[\text{A}\right]}_t=\ln {\left[\text{A}\right]}_0-kt$

[A]_t − concentration of A at time t

[A]₀ − initial concentration of A

k − rate constant

t − time

(c)

Interpretation Introduction

Interpretation:

The half-life for the thermal degradation of silk for each of the three experiments should be calculated.

Concept Introduction:

Half-life for first order reaction can be calculated by,

  $t_{1/2}=\frac{\ln 2}{k}$