Integrated Rate Laws

Question 1

What is the rate of reaction for a first order reaction?

Answer 1

o When a reaction is overall first order with respect to one of the reactants, then the rate of the reaction is simply proportional to the amount of that reactant

Question 2

Describe the plot for a first order reaction?

Answer 2

a plot of the ln[A] vs time will yield a straight line with a slope of -k and intercept of ln[A]0

Question 3

When is an integrated rate law most useful?

Answer 3

when the rate to the reactions depends only on one chemical species

Question 4

What does an integrated rat law yield?

Answer 4

o We can integrate the rate law to yield an equation of the concentration of a particular species as a function of time

Question 5

What does the “pseudo-first order rate constant” k’ depend on?

Answer 5

the value of the overall rate constant, k, and the initial (fixed) concentration of high concentration reactant

Question 6

Describe the plot of a second order reaction

Answer 6

 A plot of 1/[A] will yield a straight line

 Slope is positive

Question 7

What is the rate of a reaction for a zero order reaction?

Answer 7

o If a reaction is zeroth order overall, it means that the rate of the reaction is independent of all of the concentrations of the reactant
 This means that the rate of the reaction will not change as the reaction proceeds

Question 8

How do you simplify a pseudo first order reaction?

Answer 8

o Simplify by making the initial concentrations of one of the reactants very very high compared to the other which essentially eliminates the concentration dependence of one of the reactants

Question 9

Describe the plot of a zero order reaction

Answer 9

 The concentration of A is linearly decreasing in time from the initial concentration
 A plot of the concentration as a function of time should yield a linear plot

Question 10

What is a pseudo first order reaction?

Answer 10

o When a reaction is 2nd order overall but is first order with respect to two reactants