3.1.9 Rate Equations

Question 1

Rate of reaction =

Answer 1

Change in conc reactant/product / time

Rate = k[A]^m[B]^n

Question 2

First order

Answer 2

Doubling the concentration of reactant, doubles the rate of reaction
Tripling conc triples rate

Question 3

Second order

Answer 3

Doubling concentration reactants, quadruples rate
Tripling nonuples

Question 4

Zero order

Answer 4

Multiplying concentration has no effect on rate

Question 5

State what a rate equation is

Answer 5

mathematical expressions that describe the relationship between the rate of a chemical reaction and the concentration of its reactants

Question 6

Define the term rate constant of a rate equation

Answer 6

the proportionality constant in the equation that expresses the relationship between the rate of a chemical reaction and the concentrations of the reacting substances.

Question 7

Define the expression rate determining step of a reaction

Answer 7

the slowest step of a chemical reaction that determines the speed (rate) at which the overall reaction proceeds

Question 8

Describe the connection between the rate equation of a reaction and the reaction mechanism

Answer 8

The rate-determining step limits the overall rate and determines the rate law for the overall reaction

Question 9

Explain qualitatively why doubling the temperature has a much greater effect on
the rate of the reaction than doubling the concentration of E.

Answer 9

Reaction occurs when molecules have E≥Ea
Doubling T causes many more molecules to have this E
Whereas doubling [E] only doubles the number with this E