Question

Describe how the four major factors influence the rate of a chemical reaction.

(a) concentration of reactants

As the concentration of reactants increases, the number of collisions per unit time  ---Select--- increase decrease , and the reaction rate  ---Select--- increases decreases .

(b) frequency factor

The frequency factor is a measure of molecular obstruction. More obstruction in a molecule leads to a  ---Select--- higher lower frequency factor, which  ---Select--- increases decreases the rate constant, resulting in  ---Select--- an increased a decreased overall reaction rate.

(c) activation energy

The activation energy describes the minimum amount of energy reactant molecules must have in order to react. If the activation energy is low, then  ---Select--- fewer more molecules will possess sufficient energy to react, and the rate of a reaction will  ---Select--- increase decrease .

(d) temperature

Temperature is a measure of average kinetic energy of the molecules. Higher temperatures result in a  ---Select--- higher lower average kinetic energy for the molecules, which translates to  ---Select--- fewer more molecules possessing sufficient energy to react and  ---Select--- fewer more collisions resulting in successful reactions. Additionally, higher kinetic energy translates to  ---Select--- higher lower molecular velocities, which  ---Select--- increases decreases the frequency of collisions in the reaction mixture. This change in frequency of collisions results in  ---Select--- fewer more frequent successful collisions, and thus the reaction rate  ---Select--- increases decreases .

Answer 1