Question detail
Chemical changes case 157 redox-boundary. A student explains a redox change. Which option uses the safest chemistry wording? Focus on Write simple ionic half equations for oxidation and in Oxidation and reduction in terms of electrons (HT only), not on a neighbouring Unit 4.4 reaction idea.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reactivity of metals
Question
- A. Chemical changes case 157 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for Write simple ionic half equations for oxidation and
- B. Chemical changes case 157 redox-boundary: Uses reduction and displacement as if they mean the same thing (Oxidation and reduction in terms of electrons (HT only))
- C. Chemical changes case 157 redox-boundary: Calls the reaction redox without naming what changes (Write simple ionic half equations for oxidation and)
- D. Chemical changes case 157 redox-boundary: Confuses oxidation state with ionic charge in the answer (Reactivity of metals)
Answer
The correct option is Chemical changes case 157 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for Write simple ionic half equations for oxidation and.
Explanation
The correct option is Chemical changes case 157 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for Write simple ionic half equations for oxidation and. It is correct because it directly supports the approved learning objective to (HT only) Write simple ionic half equations for oxidation and reduction when ions and charges are supplied in Oxidation and reduction in terms of electrons (HT only). The other options are incorrect because they blur a Unit 4.4 concept boundary: acid versus alkali versus base, oxidation versus reduction, displacement versus reduction, electrolysis versus electroplating, anode versus cathode, positive versus negative ions, oxidation state versus ionic charge, or strong acid versus concentrated acid.
Common mistake
Common Mistake in Writing Ionic Half Equations
Students often confuse oxidation and reduction half equations, writing the wrong species as oxidised or reduced.
To fix this, remember that oxidation involves loss of electrons and reduction involves gain of electrons. Carefully identify the charges and species involved before writing the half equations.
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