Question detail

Explain how continuous monitoring can be used to measure the rate of a reaction. What equipment might be necessary?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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Topic

A-level practical endorsement and required practical activities

Question

Explain how continuous monitoring can be used to measure the rate of a reaction. What equipment might be necessary?

Answer

Continuous monitoring of a reaction rate can be achieved by using a colorimeter to measure changes in color or a gas syringe to measure the volume of gas produced over time. The data collected can be plotted to create a rate versus time graph, allowing for the determination of the reaction rate at any point during the reaction. This answer is anchored to A-level required practical activities.

Explanation

Continuous monitoring of a reaction rate can be achieved by using a colorimeter to measure changes in color or a gas syringe to measure the volume of gas produced over time. The data collected can be plotted to create a rate versus time graph, allowing for the determination of the reaction rate at any point during the reaction. 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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