AP Chemistry Unit 5 Review

Front

What is the relationship between concentration and time for a second order reaction?

Back

For a second order reaction, a plot of 1/[A] vs time will yield a linear relationship.

Front

What is the overall reaction for the following steps: Step 1: AB + C2 → ABC + C (slow); Step 2: C + AB → ABC (fast)?

Back

The overall reaction is 2AB + C2 → 2ABC.

Front

What is the rate law for the reaction given the following steps: Step 1: AB + C2 → ABC + C (slow); Step 2: C + AB → ABC (fast)?

Back

The rate law is Rate = k[AB][C2].

Front

If a graph of 1/concentration (reciprocal concentration) versus time is linear, what is the order of the reaction?

Back

The order of the reaction is second order.

Front

In a first order reaction, what happens to the rate constant (k) and the rate as the reaction proceeds at constant temperature?

Back

k remains the same; rate decreases.

Front

What is the definition of a second order reaction?

Back

A second order reaction is one where the rate is proportional to the square of the concentration of one reactant or the product of the concentrations of two reactants.

Front

How can you determine the order of a reaction from a concentration vs time graph?

Back

If the plot of concentration vs time is linear, the reaction is zero order; if the plot of ln[A] vs time is linear, the reaction is first order; if the plot of 1/[A] vs time is linear, the reaction is second order.

Front

What is the significance of the slow step in a multi-step reaction mechanism?

Back

The slow step determines the rate law of the overall reaction.

Front

What is the integrated rate law for a second order reaction?

Back

The integrated rate law is 1/[A] = kt + 1/[A]0.

Front

What does the term 'rate constant' (k) signify in a chemical reaction?

Back

The rate constant (k) is a proportionality factor that relates the rate of a reaction to the concentrations of the reactants.