Question detail
Why does the rate of reaction typically decrease over time?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Rate of reaction
Question
- A. The temperature increases.
- B. The concentration of reactants decreases.
- C. The pressure increases.
- D. The surface area increases.
Answer
The concentration of reactants decreases.
Explanation
The correct answer is The concentration of reactants decreases.. This answer directly addresses the question: Why does the rate of reaction typically decrease over time? It matches the approved Chemistry 8462 learning objective and the linked subtopic. The other options are incorrect because they either change the rate, catalyst, reversible reaction, equilibrium, or graph context, or they do not answer the exact point being tested.
Common mistake
Misunderstanding Reaction Rate Decrease
Students often think that the rate of reaction decreases because the reactants are used up completely.
Explain that the rate usually decreases due to fewer effective collisions between reactant particles as their concentration decreases over time.
Related flashcards
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Related practice questions
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