Question detail
For Mass changes when a reactant or product is a gas, which option best supports this Unit 4.3 objective: Link gas escape or gas uptake to whether mass appears to decrease or increase in an open apparatus?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations
Question
- A. The mass decreases
- B. The mass increases
- C. The mass remains the same
- D. The mass fluctuates
Answer
The correct option is The mass decreases.
Explanation
The correct option is The mass decreases. The mass decreases is correct because it directly supports the approved learning objective to link gas escape or gas uptake to whether mass appears to decrease or increase in an open apparatus. 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 gas 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 think that the mass of a system always remains constant, even when gases are involved in reactions.
Emphasize that gas escape or uptake can lead to apparent mass changes in an open system, and relate this to the conservation of mass principle.
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