Question detail
What is the purpose of evaluating practical procedures in terms of uncertainty and accuracy?
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 identify potential errors and improve reliability
- B. To ensure results are always correct
- C. To make the experiment easier to conduct
- D. To reduce the time taken for experiments
Answer
To identify potential errors and improve reliability
Explanation
The correct option is To identify potential errors and improve reliability. To identify potential errors and improve reliability is the best answer because it directly supports the AQA A-Level Chemistry objective to evaluate practical procedures using uncertainty, error, accuracy and precision. This reasoning is anchored to A-level practical endorsement in A-level practical endorsement and required practical activities, and it separates uncertainty 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 Uncertainty in Measurements
Students often state that uncertainty is simply the difference between the highest and lowest measurements taken.
Uncertainty should be expressed as a range or a percentage of the measurement, reflecting the precision of the measuring instrument used.
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