Question detail
For Conservation of mass and balanced chemical equations, which option best supports this Unit 4.3 objective: Represent chemical reactions using balanced symbol equations?
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 total mass of reactants equals the total mass of products
- B. Mass can be created during a chemical reaction
- C. Mass can be destroyed during a chemical reaction
- D. Only gases are affected by the conservation of mass
Answer
The correct option is The total mass of reactants equals the total mass of products.
Explanation
The correct option is The total mass of reactants equals the total mass of products. The total mass of reactants equals the total mass of products is correct because it directly supports the approved learning objective to represent chemical reactions using balanced symbol equations. 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
Misunderstanding Balanced Equations
Students often forget to ensure that the number of atoms of each element is the same on both sides of the equation when writing balanced symbol equations.
To fix this, carefully count the number of atoms for each element on both sides and adjust the coefficients in front of the compounds until they match.
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