Multiple Choice
Which of the following best explains why increasing temperature generally speeds up chemical reactions?
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15. Chemical Kinetics
Factors Influencing Rates
Multiple Choice
Which of the following best describes the effect of increasing temperature on the rate of a chemical reaction?
A
It causes the reaction rate to decrease because fewer collisions occur.
B
It has no effect on the reaction rate.
C
It decreases the reaction rate by slowing down molecular movement.
D
It increases the reaction rate by providing more energy for collisions.
Verified step by step guidance1
Understand that the rate of a chemical reaction depends on how often and how effectively reactant molecules collide.
Recall the collision theory, which states that molecules must collide with sufficient energy (activation energy) and proper orientation for a reaction to occur.
Recognize that increasing temperature increases the average kinetic energy of molecules, causing them to move faster.
Faster molecular movement leads to more frequent collisions and a higher proportion of collisions with enough energy to overcome the activation energy barrier.
Conclude that increasing temperature increases the reaction rate by providing more energy for effective collisions, making the reaction proceed faster.
