Question detail

For Gas volumes and amount of substance, which option best supports this Unit 4.3 objective: (chemistry only) (HT only) Change the subject of equations used for gas-volume calculations. (MS 3b)?

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

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At a glance

MCQ

Type

practice

Style

Topic

Use of amount of substance in relation to volumes of gases (chemistry only) (HT only)

Question

A. Equal moles of gases occupy the same volume.
B. Different gases occupy different volumes.
C. One mole of gas always occupies 22.4 dm3.
D. Gas volumes are independent of temperature.

Answer

The correct option is Equal moles of gases occupy the same volume..

Explanation

The correct option is Equal moles of gases occupy the same volume.. Equal moles of gases occupy the same volume. is correct because it directly supports the approved learning objective to (chemistry only) (HT only) Change the subject of equations used for gas-volume calculations. (MS 3b). The reasoning belongs to Gas volumes and amount of substance within Use of amount of substance in relation to volumes of gases (chemistry only) (HT only), 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 chemistry only 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

Changing the Subject of Equations

Students often forget to isolate the variable correctly when changing the subject of gas-volume equations, leading to incorrect formulas.

To fix this, practice rearranging equations step-by-step, ensuring each operation is applied to both sides of the equation to maintain balance.

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