Question detail
For Conservation of mass and balanced chemical equations, which option best supports this Unit 4.3 objective: Balance symbol equations by making the number of atoms of each element the same on both sides?
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. 2H2 + O2 → 2H2O
- B. H2 + O2 → H2O
- C. H2 + O2 → H2O2
- D. 2H2 + 2O2 → 2H2O
Answer
The correct option is 2H2 + O2 → 2H2O.
Explanation
The correct option is 2H2 + O2 → 2H2O. 2H2 + O2 → 2H2O is correct because it directly supports the approved learning objective to balance symbol equations by making the number of atoms of each element the same on both sides. 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 symbol equation 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
Miscounting Atoms
Students often forget to account for the coefficients in front of compounds when balancing equations, leading to incorrect atom counts.
Always include the coefficients when counting atoms for each element on both sides of the equation to ensure they are equal.
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