Question detail
Chemical changes case 158 reactivity-evidence. A student uses the reactivity series to justify an observation. Which option is best? 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 158 reactivity-evidence: Uses the relative reactivity order to predict the change for Write simple ionic half equations for oxidation and
- B. Chemical changes case 158 reactivity-evidence: Chooses the product by memorising a colour instead of the series (Oxidation and reduction in terms of electrons (HT only))
- C. Chemical changes case 158 reactivity-evidence: Says any metal can displace any other metal ion (Write simple ionic half equations for oxidation and)
- D. Chemical changes case 158 reactivity-evidence: Ignores whether the reacting substance is more or less reactive (Reactivity of metals)
Answer
The correct option is Chemical changes case 158 reactivity-evidence: Uses the relative reactivity order to predict the change for Write simple ionic half equations for oxidation and.
Explanation
The correct option is Chemical changes case 158 reactivity-evidence: Uses the relative reactivity order to predict the 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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