Question detail

Chemical changes case 074 salt-method. A student plans a salt preparation method. Which option is most creditworthy? Focus on movement negative ions the anode during electrolysis in The process of electrolysis, 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 074 salt-method: Uses the correct reactants, separation step and crystallisation idea for movement negative ions the anode during electrolysis
B. Chemical changes case 074 salt-method: Evaporates to dryness when crystals should be formed carefully (The process of electrolysis)
C. Chemical changes case 074 salt-method: Adds indicator to every salt preparation regardless of method (movement negative ions the anode during electrolysis)
D. Chemical changes case 074 salt-method: Names a salt but omits how excess solid or solution is handled (Electrolysis)

Answer

The correct option is Chemical changes case 074 salt-method: Uses the correct reactants, separation step and crystallisation idea for movement negative ions the anode during electrolysis.

Explanation

The correct option is Chemical changes case 074 salt-method: Uses the correct reactants, separation step and crystallisation idea for movement negative ions the anode during electrolysis. It is correct because it directly supports the approved learning objective to describe movement of negative ions to the anode during electrolysis in The process of electrolysis. 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

Negative ions move to the anode

Students often think that negative ions travel to the anode during electrolysis

Explain that negative ions (anions) are attracted to the positive electrode, the anode, and are oxidised there, releasing electrons into the external circuit

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For The process of electrolysis, which electrolysis focus answer best supports this Unit 4.4 objective: Describe movement of negative ions to the anode during electrolysis?