Open Question
Which of the following factors directly impacts the rate at which a liquid evaporates?
15. Chemical Kinetics
Factors Influencing Rates
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Consider a bimolecular reaction in the gas phase. Which one of the following changes in condition will not cause an increase in the rate of the reaction?
A
Add a catalyst
B
Increase the temperature at constant volume
C
Increase the volume at constant temperature
Verified step by step guidance1
Understand that a bimolecular reaction involves two reactant molecules colliding to form products. The rate of such reactions depends on the frequency and energy of these collisions.
Recognize that adding a catalyst provides an alternative reaction pathway with a lower activation energy, increasing the reaction rate by allowing more collisions to result in a successful reaction.
Realize that increasing the temperature at constant volume increases the kinetic energy of the molecules, leading to more frequent and energetic collisions, thus increasing the reaction rate.
Consider the effect of increasing the volume at constant temperature. This change decreases the concentration of reactant molecules, leading to fewer collisions per unit time, which does not increase the reaction rate.
Conclude that increasing the volume at constant temperature is the condition that will not cause an increase in the rate of the reaction, as it reduces the frequency of effective collisions between reactant molecules.
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