Sergey Bylikin, Gary Horner and, Brian Murphy Solutions for Chapter: Chemical Kinetics, Exercise 4: Questions

Which of the following is an appropriate unit for rate of a reaction?

Equal masses of powdered calcium carbonate were added to separate solutions of hydrochloric acid. The calcium carbonate was in excess. The volume of carbon dioxide produced was measured at regular intervals. Which curves in the given figure represent the evolution of carbon dioxide against time for the acid solutions shown in table?

Hydrochloric acid is reacted with large pieces of calcium carbonate; the reaction is then repeated using calcium carbonate powder. How does this change affect the activation energy and the collision frequency?

Which factors can affect the rate of a chemical reaction?

I. The concentration of the reactants.

II. The temperature at which the reaction takes place.

III. The physical states of the reactants.

In an acid catalysed hydrolysis reaction of ethyl ethanoate, the concentration of the ester changes from $1.50 \mathrm{mol} {\mathrm{dm}}^{-3}$ to $0.35 \mathrm{mol} {\mathrm{dm}}^{-3}$ in $3.5 \min$, at a given temperature, ${\mathrm{T}}_1$. Which of the following statements are correct?

I. The average rate of the reaction is $0.33 \mathrm{mol} {\mathrm{dm}}^{-3} {\min }^{-1}$.

II. If the reaction is carried out at a higher temperature, ${\mathrm{T}}_2$, the reaction rate will be greater.

III. The products of the reaction will be ethanoic acid and ethanol.

Factors that affect the rate of a chemical reaction include particle size, concentration of reactants, and the temperature of the reaction. Define the term rate of a chemical reaction.

List the three characteristic properties of reactant particles that affect the rate of reaction as described by the collision theory.

Models can prove vital in chemistry. Discuss the principles of the kinetic molecular theory and the collision theory.