Question detail
For Reactions of acids with metals, which acid-base focus answer best supports this Unit 4.4 objective: Write balanced symbol equations for acid-metal reactions when formulae are supplied?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reactions of acids
Question
- A. HCl + Na -> NaCl + H2 - correct acid-base focus for acid
- B. Wrong acid-base focus: confuses acid with a nearby Unit 4.4 chemical change idea
- C. Wrong particle check: uses the wrong ion, electrode, acid-base term, or product for Reactions of acids with metals
- D. Wrong reaction link: does not support Write balanced symbol equations for acid-metal reactions when formulae are supplied
Answer
The correct option is HCl + Na -> NaCl + H2 - correct acid-base focus for acid.
Explanation
The correct option is "HCl + Na -> NaCl + H2 - correct acid-base focus for acid" because it supports the approved learning objective: Write balanced symbol equations for acid-metal reactions when formulae are supplied. The other options are incorrect or weaker because they are vague, use the wrong Chemistry context, or do not clearly explain the answer for Reactions of acids with metals.
Common mistake
Incorrect balancing of metal‑acid equations
Students often write the metal on the left and the acid on the right, or they forget to balance hydrogen gas and salt ions, leading to unbalanced equations such as HCl + Zn → ZnCl₂ + H₂
Ensure the metal is on the left, the acid on the right, and that the equation is balanced for all atoms and charge. For example, Zn + 2 HCl → ZnCl₂ + H₂
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