Question detail
For Conservation of mass and balanced chemical equations, which option best supports this Unit 4.3 objective: State that the law of conservation of mass means no atoms are lost or made during a chemical reaction?
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. It shows the conservation of mass.
- B. It has unequal numbers of atoms on each side.
- C. It only includes reactants.
- D. It is always a single arrow reaction.
Answer
The correct option is It shows the conservation of mass..
Explanation
The correct option is It shows the conservation of mass.. It shows the conservation of mass. is correct because it directly supports the approved learning objective to state that the law of conservation of mass means no atoms are lost or made during a chemical reaction. The reasoning belongs to Conservation of mass and balanced chemical equations 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 conservation of mass 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 Atom Conservation
Students often think that atoms can be created or destroyed during a chemical reaction.
Emphasize that the law of conservation of mass states that no atoms are lost or made; they are simply rearranged.
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