Kinetics Chemistry

Which statement about a reaction best describes the relationship between the temperature, T, and the rate constant, k?

• As T increases, k decreases linearly.

• As T increases, k decreases non-linearly.

• As T increases, k increases linearly.

• As T increases, k increases non-linearly.

Tags

NGSS.HS-PS1-5

Which graph represents a reaction that is first order with respect to reactant A.

• A

• B

• C

• D

Tags

NGSS.HS-PS1-5

Which step is the rate-determining step of a reaction?

• The step with the lowest activation energy

• The final step

• The step with the highest activation energy

• The first step

Tags

NGSS.HS-PS1-5

The rate information below was obtained for the following reaction at a constant temperature. 2NO2(g)+F2(g)→2NO2F(g) What are the orders of the reaction with respect to NO2 and F2?

• NO2 is first order and F2 is second order

• NO2 is second order and F2 is first order

• NO2 is first order and F2 is first order

• NO2 is second order and F2 is second order

Tags

NGSS.HS-PS1-5

Consider the following reaction. 2P+Q→R+S This reaction occurs according to the following mechanism. P+Q→XslowP+X→R+Sfast What is the rate expression?

• rate = k [P]

• rate = k [P] [X]

• rate = k [P] [Q]

• rate = k [P]^2

Tags

NGSS.HS-PS1-5

The following data were obtained for the reaction between gases A and B.

• rate = k [B]^2

• rate = k [A]^2

• rate = k [A]

• rate = k [B]

Tags

NGSS.HS-PS1-5

Consider the following reaction. 5Br−(aq)+BrO−3(aq)+6H+(aq)→3Br2(aq)+3H2O(l) The rate expression for the reaction is found to be: rate=k[Br−][BrO−3][H+]2 Which statement is correct?

• The overall order is 12.

• Doubling the concentration of all of the reactants at the same time would increase the rate of the reaction by a factor of 16.

• The units of the rate constant, k, are mol dm−3s−1.

• A change in concentration of Br− or BrO−3 does not affect the rate of the reaction.

Tags

NGSS.HS-PS1-5

The rate expression for a reaction is:

rate=k[X][Y]

Which statement is correct?

• As the temperature increases the rate constant decreases.

• The rate constant increases with increased temperature but eventually reaches a constant value.

• As the temperature increases the rate constant increases.

• The rate constant is not affected by a change in temperature.

Tags

NGSS.HS-PS1-5

Consider the following reaction mechanism. Step 1H2O2+I−→H2O+IO−slowStep 2H2O2+IO−→H2O+O2+I−fast Which statement correctly identifies the rate-determining step and the explanation?

• Step 2 because it is the faster step

• Step 1 because it is the slower step

• Step 1 because it is the first step

• Step 2 because it is the last step

Tags

NGSS.HS-PS1-5

What is the intercept on the y-axis when a graph of lnk is plotted against 1T on the x-axis?

• lnA

• 
• 
• E_a

Tags

NGSS.HS-PS1-5