Multiple Choice
Which of the following is a primary reason why the rate of some chemical reactions is very slow?
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15. Chemical Kinetics
Factors Influencing Rates
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Which of the following will increase the rate of a chemical reaction?
A
Lowering the surface area of a solid reactant
B
Increasing the concentration of reactants
C
Adding an inert gas at constant volume
D
Decreasing the temperature
Verified step by step guidance1
Understand that the rate of a chemical reaction depends on factors that affect how often and how energetically reactant particles collide.
Recall that increasing the concentration of reactants increases the number of particles per unit volume, which leads to more frequent collisions and thus increases the reaction rate.
Recognize that lowering the surface area of a solid reactant decreases the available area for collisions, which would decrease the reaction rate, not increase it.
Know that adding an inert gas at constant volume does not change the concentration of reactants, so it does not affect the reaction rate.
Remember that decreasing the temperature reduces the kinetic energy of particles, leading to fewer effective collisions and a slower reaction rate.
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