Question detail
Chemical changes case 114 redox-boundary. A student explains a redox change. Which option uses the safest chemistry wording? Focus on the order potassium sodium lithium calcium magnesium carbon in The reactivity series, 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 114 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for the order potassium sodium lithium calcium magnesium carbon
- B. Chemical changes case 114 redox-boundary: Uses reduction and displacement as if they mean the same thing (The reactivity series)
- C. Chemical changes case 114 redox-boundary: Calls the reaction redox without naming what changes (the order potassium sodium lithium calcium magnesium carbon)
- D. Chemical changes case 114 redox-boundary: Confuses oxidation state with ionic charge in the answer (Reactivity of metals)
Answer
The correct option is Chemical changes case 114 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for the order potassium sodium lithium calcium magnesium carbon.
Explanation
The correct option is Chemical changes case 114 redox-boundary: Links oxidation or reduction to the correct electron or oxygen change for the order potassium sodium lithium calcium magnesium carbon. It is correct because it directly supports the approved learning objective to recall the order of potassium, sodium, lithium, calcium, magnesium, carbon, zinc, iron, hydrogen, copper and gold in the reactivity series in The reactivity series. 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
Order of Reactivity Confusion
Students often confuse the order of metals in the reactivity series, particularly mixing up the positions of zinc and iron.
To fix this, students should create a mnemonic or visual aid to remember the correct order: 'Potassium, Sodium, Lithium, Calcium, Magnesium, Carbon, Zinc, Iron, Hydrogen, Copper, Gold'.
Related flashcards
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Related practice questions
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