# Worksheet: Rate Laws from Initial Rates

Q1:

Hypochlorite and iodide ions react to form hypoiodite and chloride ions: The initial rate of reaction was measured at three different reactant concentrations, as shown in the table.

(M) (M) Initial Rate (M/s)

Determine the rate law for this reaction.

• A Rate =
• BRate =
• CRate =
• DRate =
• ERate =

Determine the appropriate units for the rate constant of this reaction, .

• A L2/mol2⋅s
• B L3/mol3⋅s
• C L/mol⋅s
• D s−1
• E M/s

Expressing concentrations in molars and time in seconds, estimate, to 3 significant figures, the numerical value of the rate constant, .

• A
• B
• C
• D
• E

Q2:

Nitric oxide reacts with chlorine to form nitrosyl chloride : The initial rate of reaction of nitric oxide was measured at three different reactant concentrations, as shown in the table.

(M) (M) Initial Rate (M/s)
0.100 0.100
0.100 0.150
0.150 0.100

Determine the rate law for this reaction.

• A Rate =
• BRate =
• CRate =
• DRate =
• ERate =

Determine the appropriate unit for the rate constant of this reaction, .

• A L2/mol2⋅s
• B L3/mol3⋅s
• C L/mol⋅s
• D s−1
• E M/s

Expressing concentrations in units of molars and times in units of seconds, estimate, to 3 significant figures, the numerical value of the rate constant, .

Q3:

 Time (s) [ A ] (M) 4 8 12 16 20 0.22 0.144 0.11 0.088 0.074

By plotting suitable functions of the tabulated data, determine the appropriate unit for the rate constant of this reaction.

• A L2/mol2⋅s
• B s−1
• C M/s
• D L/mol⋅s
• E L3/mol3⋅s

Expressing concentrations in molars and time in seconds, estimate, to 3 significant figures, the numerical value of the rate constant for this reaction.

Q4:

In a reaction between compounds and , doubling the concentration of increases the rate of reaction by a factor of 4. However, tripling the concentration of reactant increases the rate by a factor of 3.

What is the order of reaction with respect to ?

What is the order of reaction with respect to ?

Q5:

In a reaction between compounds and , quadrupling the concentration of doubles the rate of reaction. However, doubling the concentration of reactant increases the rate by a factor of 8.

What is the order of reaction with respect to ?

• A1
• B
• C2
• D
• E4

What is the order of reaction with respect to ?