The reaction A + B + C = products has a rate law rate = kA]C]2. Which of the following will result in an increase in the rate constant for the reaction?
#1 - increasing the temperature
#2 - adding a catalyst
#3 - doubling the concentration of reactant C
a. only one of these (only #1 or only #2 or only #3)
b. #1 and #2 only
c. #1 and #3 only
d. #2 and #3 only
e. all three will result in an increase in the rate constant for the reaction.
HELP HELP HELP!
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The rate CONSTANT changes with T but it does not change with the addition of a catalyst or changing concn. Adding a catalyst WILL change the rate (but not the constant) and changing the concn of C WILL change the rate but not the constant.
To determine which of the options will result in an increase in the rate constant for the reaction, let's analyze each option:
1. Increasing the temperature: According to the Arrhenius equation, an increase in temperature generally increases the rate constant for a reaction. This is because at higher temperatures, the reactant molecules move faster and collide more frequently, leading to an increased rate of reaction.
2. Adding a catalyst: A catalyst is a substance that increases the rate of a chemical reaction by lowering the activation energy required for the reaction to occur. The presence of a catalyst does not change the rate constant but enhances the reaction's rate by providing an alternative reaction pathway with a lower activation energy.
3. Doubling the concentration of reactant C: In the given rate law, [C] is raised to the power of 2. Therefore, if the concentration of reactant C is doubled, the rate constant will increase. This is because an increase in concentration leads to an increase in the frequency of collisions between reactant particles, resulting in a higher reaction rate.
Considering the explanations above, we can conclude that all three options, #1 (increasing the temperature), #2 (adding a catalyst), and #3 (doubling the concentration of reactant C), will result in an increase in the rate constant for the reaction.
Therefore, the correct answer is e. all three will result in an increase in the rate constant for the reaction.