Multiple Choice
Which of the following would most effectively increase the rate of decomposition of hydrogen peroxide (H2O2)?
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15. Chemical Kinetics
Factors Influencing Rates
Multiple Choice
Which one of the following factors would NOT speed up a chemical reaction?
A
Decreasing the temperature
B
Increasing the surface area of a solid reactant
C
Adding a catalyst
D
Increasing the concentration of reactants
Verified step by step guidance1
Understand that the rate of a chemical reaction depends on factors that increase the frequency or energy of collisions between reactant molecules.
Recall that increasing the surface area of a solid reactant exposes more particles to react, which increases the collision frequency and speeds up the reaction.
Know that adding a catalyst provides an alternative reaction pathway with a lower activation energy, which increases the reaction rate without being consumed.
Recognize that increasing the concentration of reactants raises the number of particles in a given volume, leading to more frequent collisions and a faster reaction.
Understand that decreasing the temperature reduces the kinetic energy of molecules, leading to fewer collisions with sufficient energy to overcome the activation barrier, thus slowing down the reaction.
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