Question detail

Chemical changes case 102 acid-base-boundary. A student sorts acid, alkali and base statements. Which option keeps the terms distinct? Focus on that oxidation happens the anode because negative ions 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 102 acid-base-boundary: Keeps the acid-base distinction tied to the named substance for that oxidation happens the anode because negative ions
B. Chemical changes case 102 acid-base-boundary: Treats every base as an alkali without checking solubility (Representation of reactions at electrodes as half equations (HT only))
C. Chemical changes case 102 acid-base-boundary: Uses pH wording but does not identify the acid-base role (that oxidation happens the anode because negative ions)
D. Chemical changes case 102 acid-base-boundary: Names a salt product without explaining the reaction context (Electrolysis)

Answer

The correct option is Chemical changes case 102 acid-base-boundary: Keeps the acid-base distinction tied to the named substance for that oxidation happens the anode because negative ions.

Explanation

The correct option is Chemical changes case 102 acid-base-boundary: Keeps the acid-base distinction tied to the named substance for that oxidation happens the anode because negative ions. It is correct because it directly supports the approved learning objective to (HT only) Explain that oxidation happens at the anode because negative ions lose electrons 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

Oxidation at the Anode

Students often confuse oxidation with reduction, thinking that oxidation occurs at the cathode instead of the anode.

Remember that oxidation happens at the anode where negative ions lose electrons, while reduction occurs at the cathode where positive ions gain electrons.

Related flashcards

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For Representation of reactions at electrodes as half equations (HT only), which acid-base focus answer best supports this Unit 4.4 objective: (HT only) Explain that oxidation happens at the anode because negative ions lose electrons?