Question detail
What is a catalyst?
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. A substance that increases the rate of a reaction and is used up in the process
- B. A substance that changes the rate of a chemical reaction but is not used up
- C. A product formed duringa chemical reaction
- D. A reactant that decreases the activation energy
Answer
A substance that changes the rate of a chemical reaction but is not used up
Explanation
The correct answer is A substance that changes the rate of a chemical reaction but is not used up. This answer directly addresses the question: What is a catalyst? 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
Ignoring Catalysts in Equations
Students often include catalysts in the overall chemical equation for the reaction.
Remember that catalysts are not part of the overall equation; they facilitate the reaction but do not get consumed.
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