Question detail

For Mass changes when a reactant or product is a gas, which option best supports this Unit 4.3 objective: Explain apparent mass changes in terms of the particle model?

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

Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

Question

A. Particles escape into the atmosphere
B. Particles are created during the reaction
C. Particles are absorbed from the environment
D. Particles change state without affecting mass

Answer

The correct option is Particles escape into the atmosphere.

Explanation

The correct option is Particles escape into the atmosphere. Particles escape into the atmosphere is correct because it directly supports the approved learning objective to explain apparent mass changes in terms of the particle model. The reasoning belongs to Mass changes when a reactant or product is a gas 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 mass change 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 Mass Changes

Students often believe that mass is lost during a reaction when a gas escapes, not realizing that the total mass remains constant according to the particle model.

To fix this, students should focus on the particle model, understanding that the mass of the gas is still accounted for, even if it is not contained in the reaction vessel.

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