Question detail
For Concentration of solutions, which option best supports this Unit 4.3 objective: Distinguish mass concentration in g/dm^3 from amount concentration in mol/dm^3?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Use of amount of substance in relation to masses of pure substances
Question
- A. 5 g/dm³
- B. 4 g/dm³
- C. 6 g/dm³
- D. 7 g/dm³
Answer
The answer is 5 g/dm3.
Explanation
The correct option is 5 g/dm³. This uses Concentration in g/dm3 because the objective is about distinguish mass concentration in g/dm^3 from amount concentration in mol/dm^3. The reasoning belongs to Concentration of solutions within Use of amount of substance in relation to masses of pure substances, 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 concentration 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
Confusing Concentration Units
Students often confuse mass concentration (g/dm^3) with amount concentration (mol/dm^3), leading to incorrect calculations.
To fix this, remember that mass concentration measures the mass of solute per volume of solution, while amount concentration measures the number of moles of solute per volume of solution. Always check which unit is required for the calculation. Keep the correction anchored to Concentration of solutions; check formula, substitution, calculation, final answer, and unit where relevant.
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