Question detail

For Limiting reactants (HT only), which option best supports this Unit 4.3 objective: (HT only) Explain how a limiting quantity of reactant affects the amount of product possible?

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 masses of pure substances

Question

A. To ensure the limiting reactant is completely used
B. To increase the cost of the reaction
C. To decrease the amount of product formed
D. To make the reaction faster

Answer

The correct option is To ensure the limiting reactant is completely used.

Explanation

The correct option is To ensure the limiting reactant is completely used. To ensure the limiting reactant is completely used is correct because it directly supports the approved learning objective to (HT only) Explain how a limiting quantity of reactant affects the amount of product possible. The reasoning belongs to Limiting reactants (HT only) 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 HT 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 Limiting Reactants

Students often think that the limiting reactant is the one present in the smallest mass, rather than the one that runs out first based on the mole ratio.

To fix this, students should practice calculating the moles of each reactant and compare them using the balanced equation to determine which reactant limits the product formation.

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