Question detail

Chemical changes case 161 redox-boundary. A student explains a redox change. Which option uses the safest chemistry wording? Focus on Balance charge and atoms simple electrolysis half equations in Representation of reactions at electrodes as half equations (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.

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At a glance

MCQ

Type

practice

Style

Topic

Electrolysis

Question

A. Chemical changes case 161 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for Balance charge and atoms simple electrolysis half equations
B. Chemical changes case 161 redox-boundary: Uses reduction and displacement as if they mean the same thing (Representation of reactions at electrodes as half equations (HT only))
C. Chemical changes case 161 redox-boundary: Calls the reaction redox without naming what changes (Balance charge and atoms simple electrolysis half equations)
D. Chemical changes case 161 redox-boundary: Confuses oxidation state with ionic charge in the answer (Electrolysis)

Answer

The correct option is Chemical changes case 161 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for Balance charge and atoms simple electrolysis half equations.

Explanation

The correct option is Chemical changes case 161 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for Balance charge and atoms simple electrolysis half equations. It is correct because it directly supports the approved learning objective to (HT only) Balance charge and atoms in simple electrolysis half equations in Representation of reactions at electrodes as half equations (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 Balancing Half Equations

Students often forget to balance the charge in half equations, leading to incorrect representations of the reactions.

Always check that the total charge on both sides of the half equation is equal, adjusting the number of electrons as necessary.

Related flashcards

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For Representation of reactions at electrodes as half equations (HT only), which redox focus answer best supports this Unit 4.4 objective: (HT only) Balance charge and atoms in simple electrolysis half equations?