Chapter 16 T/F

Catalysts are not consumed by the reaction.

True

Catalysts are never listed in the rate law.

False

Catalysts are reaction intermediates.

False

Catalysts change the reaction pathway of reactions in such a way that the reactions become more exothermic.

False

Catalysts increase the rate of the forward reaction and reduce the rate of the reverse reaction.

False

Catalysts increase the size of the equilibrium constant so that there are more products at equilibrium.

False

If K > 1 for a reaction, then the activation energy for the forward reaction is larger than the activation energy for the reverse reaction.

False

If a plot of one over the concentration of a reactant as a function of time is linear, it means that the reaction is first-order relative to that reactant.

False

If a plot of the concentration of a reactant as a function of time is linear, it means that the reaction is first-order relative to that reactant.

False

If a plot of the concentration of a reactant as a function of time is linear, it means that the reaction is second-order relative to that reactant.

False

If a plot of the natural log of the concentration of a reactant as a function of time is linear, it means that the reaction is second-order relative to that reactant.

False

The half-life for both first-order and second-order reactions are independent of the initial concentration.

False

The larger the activation energy, the larger the rate constant.

False

The rate of a chemical reaction always increases with increasing temperature.

False

The rate of a chemical reaction increases with increasing temperature because at higher temperatures chemical bonds are weaker.

False

The rate of a chemical reaction increases with increasing temperature because of a decrease in the activation energy at higher temperatures.

False

The rate of a chemical reaction increases with increasing temperature because of an increase in the activation energy at higher temperatures.

False

After two half-lives, there will be 25% left of the reactant, assuming that the reaction is first-order relative to that reactant.

True

Catalysts change the reaction pathway of reactions in such a way that the activation energy is lowered.

True

Catalysts increase the rates of both the forward and reverse reactions.

True

If a plot of one over the concentration of a reactant as a function of time is linear, it means that the reaction is second-order relative to that reactant.

True

If a plot of the natural log of the concentration of a reactant as a function of time is linear, it means that the reaction is first-order relative to that reactant.

True

If a reaction is exothermic, most likely the activation energy of the forward reaction is less than the activation energy of the reverse reaction.

True

If ΔG ̊ > 0 for a reaction, then the activation energy of the forward reaction is larger than the activation energy for the reverse reaction.

True

The concentrations of the reactants affect the reaction rate, but not the rate constant.

True

The higher the temperature, the larger the rate constant.

True

The rate of a chemical reaction increases with increasing temperature because the rate constant is larger at higher temperatures.

True

The rate of a chemical reaction increases with increasing temperature because the reactants have more energy.

True

Typically, the higher the surface area, the faster the reaction

True