Question detail

For Gas volumes and amount of substance, which option best supports this Unit 4.3 objective: (chemistry only) (HT only) Use ratios, fractions and percentages in gas-volume calculations. (MS 1c)?

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. They depend on the coefficients in the balanced equation.
B. They are always equal.
C. They are inversely proportional.
D. They have no relationship.

Answer

The correct option is They depend on the coefficients in the balanced equation..

Explanation

The correct option is They depend on the coefficients in the balanced equation.. They depend on the coefficients in the balanced equation. is correct because it directly supports the approved learning objective to (chemistry only) (HT only) Use ratios, fractions and percentages in gas-volume calculations. (MS 1c). 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

Misunderstanding Ratios in Gas-Volume Calculations

Students often confuse the ratios of gases in a balanced equation, leading to incorrect volume calculations.

Carefully analyze the coefficients in the balanced equation to determine the correct mole ratios before calculating the volumes.

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