Question detail
What is the purpose of measuring the rate of reaction in a practical experiment?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
A-level practical endorsement and required practical activities
Question
- A. To understand how temperature affects reaction speed
- B. To determine the concentration of reactants
- C. To evaluate the efficiency of a catalyst
- D. To analyze the effect of surface area on reaction rate
Answer
To understand how temperature affects reaction speed
Explanation
The correct option is To understand how temperature affects reaction speed. To understand how temperature affects reaction speed is the best answer because it directly supports the AQA A-Level Chemistry objective to required practical 7: measure the rate of reaction by an initial rate method and a continuous monitoring method. This reasoning is anchored to A-level required practical activities in A-level practical endorsement and required practical activities, and it separates required practical from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.
Common mistake
Misunderstanding Rate of Reaction Methods
Students often confuse the initial rate method with continuous monitoring, leading to incorrect calculations of reaction rates.
To correctly measure the rate of reaction using the initial rate method, use the formula: rate = change in concentration / time. For continuous monitoring, ensure you record concentration changes at regular intervals. For example, if the concentration of a reactant decreases from 0.5 mol/dm³ to 0.2 mol/dm³ in 10 seconds, the calculation would be: rate = (0.5 - 0.2) mol/dm³ / 10 s = 0.03 mol/dm³/s. Thus, the rate of reaction is 0.03 mol/dm³/s. Keep the correction anchored to A-level required practical activities and the objective: Required practical 7: measure the rate of reaction by an initial rate method and a continuous monitoring method.
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