Question detail
For Mass changes when a reactant or product is a gas, which option best supports this Unit 4.3 objective: Explain why the mass of a metal oxide may be greater than the mass of the metal when oxygen reacts with the metal?
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. Mass is gained from the oxygen
- B. Mass is lost due to gas production
- C. Mass remains unchanged
- D. Mass is unpredictable
Answer
The correct option is Mass is gained from the oxygen.
Explanation
The correct option is Mass is gained from the oxygen. Mass is gained from the oxygen is correct because it directly supports the approved learning objective to explain why the mass of a metal oxide may be greater than the mass of the metal when oxygen reacts with the metal. 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 metal oxide 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 Increase
Students often think that the mass of a metal oxide is greater than the mass of the metal because the metal gains weight during the reaction.
Explain that the increase in mass is due to the oxygen from the air combining with the metal, which adds to the total mass of the product.
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