Question detail
For Chemical measurements, which option best supports this Unit 4.3 objective: Make estimations of uncertainty from a set of chemical measurements?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations
Question
- A. Some uncertainty
- B. A definitive value
- C. An exact number
- D. No variation
Answer
The correct option is Some uncertainty.
Explanation
The correct option is Some uncertainty. Some uncertainty is correct because it directly supports the approved learning objective to make estimations of uncertainty from a set of chemical measurements. The reasoning belongs to Chemical measurements within Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations, so it should not be confused with nearby quantitative ideas such as mass, moles, concentration, yield, atom economy, or gas volume unless those are named in the objective. Use the focus term chemical measurement to keep the answer aligned with AQA GCSE Chemistry 8462 Unit 4.3. The other options are weaker because they either use the wrong formula, the wrong unit, a vague relationship, or the wrong quantitative context.
Common mistake
Estimating Uncertainty
Students often assume that the uncertainty in measurements is always the same for all measurements, leading to inaccurate estimations.
Encourage students to consider the range of values in their measurements and calculate uncertainty based on the spread of results.
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