Kinetics Practice MCQ's

Front

What is the rate law for the reaction X + Y→Z if the rate is given by Rate = k[X]²[Y]?

Back

The rate law indicates that the rate of the reaction depends on the concentration of X squared and the concentration of Y.

Front

If the concentration of X is doubled and the concentration of Y is tripled, by what factor does the rate increase?

Back

The rate increases by a factor of 12.

Front

What does a rate law represent in a chemical reaction?

Back

A rate law represents the relationship between the rate of a reaction and the concentration of its reactants.

Front

What is the order of a reaction with respect to a reactant?

Back

The order of a reaction with respect to a reactant is the exponent to which its concentration is raised in the rate law.

Front

What is the significance of a catalyst in a chemical reaction?

Back

A catalyst is present at the start and end of a reaction and speeds up the reaction without being consumed.

Front

What is a reaction mechanism?

Back

A reaction mechanism is a series of steps that describe how reactants are converted into products.

Front

What is the effect of doubling the concentration of A and B on the rate if the rate law is Rate = k[A]²[B]²?

Back

Doubling both A and B leads to a four-fold increase in the rate.

Front

What is the order of the reaction if the experimentally determined rate law is rate = k[IO3^-][I^-]?

Back

The order with respect to I^- is 1.

Front

What is a rate-determining step in a reaction mechanism?

Back

The rate-determining step is the slowest step in a reaction mechanism that determines the overall reaction rate.

Front

What is the role of intermediates in a reaction mechanism?

Back

Intermediates are species that are formed and consumed during the reaction mechanism but do not appear in the overall balanced equation.