Question detail
What is the definition of activation energy?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Kinetics
Question
- A. The minimum energy required for a reaction to occur
- B. The energy released during a reaction
- C. The energy needed to break bonds in reactants
- D. The energy required to form products
Answer
The minimum energy required for a reaction to occur
Explanation
Activation energy is defined as the minimum energy that reacting particles must possess for a reaction to occur. This energy is necessary to overcome the energy barrier for the reaction.
Common mistake
Misunderstanding Collision Frequency
Students often confuse collision frequency with the energy of collisions when explaining reaction rates.
To clarify, use the formula for reaction rate which relates to both collision frequency and energy. The reaction rate increases with higher collision frequency and sufficient energy to overcome activation energy. For example, if the collision frequency is 5 collisions per second and the energy is sufficient, the rate can be expressed as: rate = collision frequency x probability of successful collisions. Thus, if the collision frequency increases to 10 collisions per second, the reaction rate doubles, assuming energy remains sufficient. Therefore, the conclusion is that both factors are essential for a higher reaction rate.
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