What is the role of activation energy in a chemical reaction?

Activation Energy and Reaction Mechanisms

Interactive Video
•
Chemistry, Biology, Science
•
11th - 12th Grade
•
Hard

Patricia Brown
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
It is the energy released during a reaction.
It determines the speed of the reaction.
It is the energy stored in the products.
It is the energy required to start a reaction.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a two-step mechanism, what does the first step involve?
B and C combine.
C jumps off of B.
B jumps off of A.
A jumps onto C.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is the activation energy for a step represented in a potential energy diagram?
As the width of the bump.
As the depth of the valley.
As the height of the bump.
As the length of the reaction path.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does a potential energy diagram illustrate?
The concentration of reactants and products.
The energy changes during a reaction.
The temperature changes during a reaction.
The speed of a reaction.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What determines the rate-determining step in a reaction mechanism?
The step with the least reactants.
The step with the most products.
The step with the highest activation energy.
The step with the lowest activation energy.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the overall Delta H for a reaction?
The average of all Delta H values.
The sum of all individual Delta H values.
The difference between the highest and lowest Delta H values.
The product of all Delta H values.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which step in a reaction is endothermic?
The step where products have lower energy than reactants.
The step where products have higher energy than reactants.
The step with the smallest activation energy.
The step with the largest activation energy.
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