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 temperature of a reaction
- B. A substance that changes the rate of a chemical reaction but is not used up
- C. A substance that decreases the concentration of reactants
- D. A substance that is consumed duringa chemical reaction
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
Misunderstanding catalyst usage
Students think a catalyst is consumed during the reaction and therefore must be added in excess
Explain that a catalyst is not used up; it is only temporarily involved in the reaction pathway and can be recovered unchanged after the reaction
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