Plenary 15.4 - Instantaneous Reaction Rates and Mechanisms

What is the instantaneous rate?

• the reaction rate at a specific time

• the experimentally determined rate law

• the rate of a spontaneous reaction

• None of the above.

What is the term for a substance that is produced in one elementary step of a complex reaction and consumed in a subsequent step?

• activated complex

• intermediate

• instantaneous reactant

• rate-determining reactant

Which of the following is NOT true?

• The rate-determining step is the slowest step.

• The rate-determining step is the fastest step.

• A reaction cannot go faster than its slowest step.

• A solid changes color.

A reaction is first order in reactant A and first order in reactant B. The product is AB. The rate constant is 0.200. What is the instantaneous rate when [A] = 0.00400M and [B] = 0.00200M?

• 1.6 x 10^-2

• 1.6 x 10^-5

• 3.2 x 10^-6

• 1.6 x 10^-6

What is a reaction with two or more elementary steps called?

• compound reaction

• complex reaction

• multi-step reaction

• combined reaction

What is the slowest step in a complex reaction called?

• elementary step

• reducing step

• rate-determining step

• intermediate step