Question detail
A graph of the amount of product formed (in g) against time (in s) shows a steep curve at the start that gradually flattens. At 30 s the curve is almost horizontal. Which statement best describes the rate of reaction at 30 s?
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. The rate is high because the curve is steep.
- B. The rate is low because the curve is flat.
- C. The rate is zero because no product is formed.
- D. The rate is constant throughout the reaction.
Answer
The rate is low because the curve is flat.
Explanation
The correct answer is The rate is low because the curve is flat.. This answer directly addresses the question: A graph of the amount of product formed (in g) against time (in s) shows a steep curve at the start that gradually flattens. At 30 s the curve is almost horizontal. Which statement best describes the rate of reaction at 30 s? 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
Misinterpreting Tangents
Students often incorrectly draw tangents that do not touch the curve at the point of interest, leading to inaccurate rate estimates.
Ensure the tangent line touches the curve at the specific time point and is drawn so that it represents the slope accurately at that moment.
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