Question detail
For Conservation of mass and balanced chemical equations, which option best supports this Unit 4.3 objective: Interpret subscripts within formulae when counting atoms in balanced chemical 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 number of NaCl molecules
- B. The number of sodium atoms
- C. The number of chlorine atoms
- D. The total number of atoms
Answer
The correct option is The number of NaCl molecules.
Explanation
The correct option is "The number of NaCl molecules" because it supports the approved learning objective: Interpret subscripts within formulae when counting atoms in balanced chemical equations. The other options are incorrect or weaker because they are vague, use the wrong Chemistry context, or do not clearly explain the answer for Conservation of mass and balanced chemical equations.
Common mistake
Misinterpreting Subscripts
Students often confuse subscripts in chemical formulae with multipliers, leading to incorrect counting of atoms in balanced equations.
To fix this, students should remember that subscripts indicate the number of atoms of an element in a molecule, while multipliers apply to the entire formula. Practice identifying and counting atoms using examples. Keep the correction anchored to Conservation of mass and balanced chemical equations; check formula, substitution, calculation, final answer, and unit where relevant.
Related flashcards
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Related practice questions
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