Question detail
In evaluating practical procedures, what does uncertainty refer to?
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. The degree of doubt about the accuracy of measurements
- B. The lack of knowledge about chemical reactions
- C. The variability of chemical properties
- D. The complexity of laboratory techniques
Answer
The degree of doubt about the accuracy of measurements
Explanation
The correct option is The degree of doubt about the accuracy of measurements. The degree of doubt about the accuracy of measurements is the best answer because it directly supports the AQA A-Level Chemistry objective to demonstrate competence in apparatus and techniques across the A-level course. This reasoning is anchored to A-level practical endorsement in A-level practical endorsement and required practical activities, and it separates apparatus 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 Apparatus Use
Students often confuse the use of a burette and a pipette, leading to incorrect measurements in titrations.
Remember that a burette is used for delivering variable amounts of liquid with precision, while a pipette is used for measuring a fixed volume. Always check the apparatus markings and practice using them correctly to ensure accurate results. Keep the correction anchored to A-level practical endorsement and the objective: Demonstrate competence in apparatus and techniques across the A-level course.
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