Question detail
Why is it important to control variables when investigating the rate of reaction between sodium thiosulfate and hydrochloric acid?
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. To ensure the reaction is safe
- B. To make the experiment easier
- C. To obtain reliable and valid results
- D. To speed up the reaction
Answer
To obtain reliable and valid results
Explanation
The correct answer is To obtain reliable and valid results. This answer directly addresses the question: Why is it important to control variables when investigating the rate of reaction between sodium thiosulfate and hydrochloric acid? 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 the Reaction Process
Students often think that the reaction between sodium thiosulfate and hydrochloric acid is instantaneous and do not recognize the gradual change in visibility as the reaction progresses.
To fix this, students should observe the reaction carefully and note the time taken for the solution to become opaque, understanding that this gradual change is a key indicator of the reaction rate.
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