MediumChemistryHigh School (9–10)GeneralChemical Reactions › Types of Chemical ReactionsConceptual

In each reaction, name the substance that is oxidised and the one that is reduced.

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

$\text{PbO} + \text{H}_2 \rightarrow \text{Pb} + \text{H}_2\text{O}$
$2\text{Al} + \text{Cr}_2\text{O}_3 \rightarrow \text{Al}_2\text{O}_3 + 2\text{Cr}$
$2\text{Ca} + \text{O}_2 \rightarrow 2\text{CaO}$

Need a reminder? The key ideaShow

Oxidation is a gain of oxygen or a loss of hydrogen; reduction is a loss of oxygen or a gain of hydrogen. They happen together. The oxidising agent gives oxygen (or takes hydrogen) and is itself reduced; the reducing agent takes oxygen (or gives hydrogen) and is itself oxidised.

The worked solution

Have you tried it?

Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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In each reaction, name the substance that is oxidised and the one that is reduced.

The worked solution

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