AP Chem Unit 5 Review

Front

What is the overall order of a reaction if the rate law expression is given as rate = k[NO2]^2[Br2]?

Back

The overall order of the reaction is 3.

Front

What is the rate law for the decomposition of hydrogen peroxide (H2O2 -> H2 + O2)?

Back

Rate = k [H2O2]

Front

Define 'rate law' in the context of chemical reactions.

Back

The rate law is an equation that relates the rate of a reaction to the concentration of its reactants.

Front

What does the symbol 'k' represent in a rate law expression?

Back

The symbol 'k' represents the rate constant, which is specific to a particular reaction at a given temperature.

Front

How do you determine the order of a reaction from its rate law?

Back

The order of a reaction is determined by the sum of the exponents of the concentration terms in the rate law.

Front

What is the significance of the rate constant 'k' in a reaction?

Back

The rate constant 'k' indicates the speed of the reaction; a larger 'k' means a faster reaction.

Front

Explain the difference between zero-order, first-order, and second-order reactions.

Back

Zero-order: rate is constant; first-order: rate depends on one reactant's concentration; second-order: rate depends on the square of one reactant's concentration or the product of two reactants' concentrations.

Front

What is the integrated rate law for a first-order reaction?

Back

The integrated rate law is ln[A] = -kt + ln[A]0, where [A]0 is the initial concentration.

Front

What is the half-life of a first-order reaction?

Back

The half-life (t1/2) of a first-order reaction is constant and given by t1/2 = 0.693/k.

Front

What is the effect of temperature on the rate constant 'k'?

Back

Generally, an increase in temperature increases the rate constant 'k', leading to a faster reaction.