Chapter 17, Problem 17A.1DQ

Interpretation Introduction

Interpretation:

The characteristics of zeroth-order, first order, second order and pseudofirst-odrer reactions has to be summarized.

Concept Introduction:

Zeroth order reaction:

Zero order reaction is a reaction where the rate is independent of concentration.  This means that rate of the reaction will be equal to rate constant.

Example:

    ${\text{2N}}_{\text{2}}\text{O}\stackrel{\text{hot Pt}}{\to }{\text{2N}}_{\text{2}}{\text{+ O}}_{\text{2}}$

First order reaction:

First order reaction is a reaction in which the rate is depend only on one reactant concentration.

Example:

    ${\text{2N}}_{\text{2}}{\text{O}}_{\text{5}}\text{(l) }\stackrel{}{\to }{\text{ 4NO}}_{\text{2}}{\text{(g) + O}}_{\text{2}}\text{(g)}$

Second order reaction:

Chemical reaction that depends on the concentration of one-second order reactant or two first-order reactants. 

Example:

${\text{2NO}}_{\text{2}}\stackrel{}{\to }{\text{2NO+ O}}_{\text{2}}$

Pseudo-first order reaction:

Reaction which is not of first order but made first order by increasing the concentration of one or the other reactant.

Example:

    ${\text{CH}}_{\text{3}}{\text{COOC}}_{\text{2}}{\text{H}}_{\text{5}}{\text{ + H}}_{\text{2}}\text{O }\stackrel{}{\to }{\text{ CH}}_{\text{3}}{\text{COOH + C}}_{\text{2}}{\text{H}}_{\text{5}}\text{OH}$