Question detail
What role does concentration play in the rate of a reaction?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Key ideas in chemistry
Question
- A. Higher concentration leads to fewer collisions
- B. Lower concentration increases the reaction rate
- C. Higher concentration increases the number of collisions
- D. Concentration has no effect on reaction rates
Answer
The correct option is Higher concentration increases the number of collisions. This answer is correct because it matches the approved learning objective to explain that barriers to reaction mean chemical reactions occur at different rates in the subtopic Universal chemistry ideas.
Explanation
The correct option is Higher concentration increases the number of collisions. Higher concentration increases the number of collisions is correct because it directly supports the approved learning objective to explain that barriers to reaction mean chemical reactions occur at different rates. This belongs to the subtopic Universal chemistry ideas within Key ideas in chemistry, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Universal chemistry ideas.
Common mistake
Misunderstanding Reaction Rates
Students often think that barriers to reaction only affect the speed of the reaction and do not understand that they can prevent reactions from occurring altogether.
Emphasize that barriers to reaction can slow down or completely stop a reaction, and provide examples of how catalysts can lower these barriers to increase reaction rates.
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