Unit 4 Review

Front

What is the effect on the reaction rate if the concentration of a reactant in a third-order reaction is increased by a factor of 3?

Back

The reaction rate will increase by a factor of 27.

Front

In the rate equation Rate = k[NO]^2[O2], what happens to the rate when the concentration of NO is doubled?

Back

The rate will be quadrupled.

Front

What are intermediates in a chemical reaction?

Back

Intermediates are species that are formed in one elementary step and consumed in a subsequent step. For example, in a reaction involving N2O2 and NO, both N2O2 and NO can be intermediates.

Front

How do you determine the number of elementary steps in a reaction mechanism?

Back

The number of elementary steps can be determined by analyzing the reaction mechanism provided. Each step represents a distinct reaction event.

Front

If the rate of a reaction is given by Rate = [A][B]^2, what happens to the rate if the concentration of B increases from 0.1 M to 0.3 M?

Back

The initial rate will increase by a factor of 9.

Front

Define a third-order reaction.

Back

A third-order reaction is one where the overall reaction order is three, meaning the rate depends on the concentration of one reactant raised to the third power or the sum of the powers of the concentrations of multiple reactants equals three.

Front

What is the rate law for a reaction involving two reactants A and B, where A is first order and B is second order?

Back

The rate law is Rate = k[A][B]^2.

Front

Explain the concept of reaction order.

Back

Reaction order is the sum of the powers of the concentration terms in the rate law, indicating how the rate of reaction depends on the concentration of reactants.

Front

What is the significance of the rate constant (k) in a rate equation?

Back

The rate constant (k) is a proportionality factor that relates the rate of reaction to the concentrations of reactants, and it is specific to a given reaction at a specific temperature.

Front

How does temperature affect the rate of a chemical reaction?

Back

Generally, increasing the temperature increases the reaction rate due to higher kinetic energy, leading to more frequent and effective collisions between reactants.