Question detail
In a practical investigation of reaction rates, which of the following is NOT a controlled variable?
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. Volume of reactants
- B. Temperature
- C. Type of catalyst used
- D. Time of observation
Answer
Type of catalyst used
Explanation
The correct answer is Type of catalyst used. This answer directly addresses the question: In a practical investigation of reaction rates, which of the following is NOT a controlled variable? 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 Control Variables
Students often forget to control variables when comparing reaction rates, leading to unreliable results.
Always identify and maintain constant conditions such as temperature, concentration, and surface area to ensure a fair comparison.
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