6.4.2 — Oxidation & Reduction: Oxygen Transfer
Cambridge IGCSE Chemistry (0620) · Paper 2 / 4 Style · 15 Questions · 32 Marks
5 Definitions
5 Identifications
5 Explanations
Define oxidation in terms of oxygen transfer.
Define reduction in terms of oxygen transfer.
What term describes a reaction in which both oxidation and reduction occur simultaneously?
Define the term oxidising agent in terms of oxygen transfer.
Define the term reducing agent in terms of oxygen transfer.
Consider the reaction: PbO(s) + C(s) → Pb(s) + CO(g) Which substance is oxidised? Explain your answer.
In the same reaction: PbO(s) + C(s) → Pb(s) + CO(g) Which substance is reduced? Explain your answer.
Consider the reaction: 2Mg(s) + O₂(g) → 2MgO(s) Is magnesium oxidised or reduced? State the evidence from the equation.
In the thermite reaction: Fe₂O₃(s) + 2Al(s) → Al₂O₃(s) + 2Fe(s) Identify the oxidising agent and justify your answer.
In the thermite reaction: Fe₂O₃(s) + 2Al(s) → Al₂O₃(s) + 2Fe(s) Identify the reducing agent and justify your answer.
Explain why the conversion of CO to CO₂ is an oxidation reaction. CO(g) + ½O₂(g) → CO₂(g)
Explain why the reaction of hydrogen with copper(II) oxide is a redox reaction: CuO(s) + H₂(g) → Cu(s) + H₂O(l)
A student says: 'In the reaction C + CO₂ → 2CO, carbon is reduced because it loses atoms.' Evaluate this statement.
Explain why the rusting of iron is classified as an oxidation reaction. 4Fe(s) + 3O₂(g) + 2H₂O(l) → 2Fe₂O₃·H₂O(s)
In the blast furnace, iron is extracted from iron ore: Fe₂O₃(s) + 3CO(g) → 2Fe(l) + 3CO₂(g) (a) Explain why Fe₂O₃ is reduced in this reaction. [1] (b) Explain why CO acts as a reducing agent. [2]
🧠 Core Definitions — Memorise These
Sign In to Keep Going
You've reached the end of the free preview. Sign in — and upgrade to Plus or Pro — to keep going with Chemistry.
Full Access
Unlock all 320 lessons