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The ionic equation for the reaction between aqueous copper(II) sulfate and magnesium metal is shown. Cu2* + Mg > Mg?* + Cu This is a redox reaction as the reaction involves simultaneous oxidation and reduction. Explain, in terms of electrons, which reactant is oxidised, and which is reduced. oxidised oe PECUCED EOXPlAM...
See it on the paper →State if iron( III ) oxide is oxidised or reduced in this reaction. Explain your answer. explanation iron( III ) oxide is
See it on the paper →Explain what is meant by reduction. (i)
See it on the paper →In the second stage, carbon reacts with carbon dioxide to make carbon monoxide. C + CO 2 2CO State what happens to the carbon dioxide in this reaction. Choose from the list. combustion oxidation reduction thermal decomposition
See it on the paper →State if the reaction in part (iii) is oxidation or reduction. Explain your answer using ideas about electrons.
See it on the paper →In which equation is the underlined substance reduced?
See it on the paper →Which gases increase in quantity in the catalytic converter?
See it on the paper →Comprehensive responses • Many candidates stated that magnesium was oxidised and could explain this in terms of loss of electrons. Limited responses • Many candidates stated that copper atoms rather than copper ions became reduced.
— Examiner report, February/March 2026, 0654/42 Q6(e) (Cambridge)
Many candidates gave vague answers around the idea of having less of something and did not understand that reduction was used in a technical sense. Candidates should be familiar with these technical terms. Others repeated the sentence from the stem of the question, describing the process in a blast furnace. Some who attempted an explanation in terms of electrons got the change the wrong way around...
— Examiner report, May/June 2025, 0654/31 Q7(a)(i) (Cambridge)
The strongest candidates were more successful in recognising that the carbon dioxide was reduced.
— Examiner report, May/June 2025, 0654/41 Q7(b) (Cambridge)
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Which statement explains how oxides of nitrogen are formed in a car engine?
Lead is extracted from lead oxide by reaction with carbon. The equation for the reaction is shown. lead oxide + carbon lead + carbon dioxide Name the substance that is oxidised and the substance that is reduced in this reaction. substance oxidised
See it on the paper →Identify which substance is reduced in this reaction. Explain your answer. substance explanation
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