CHEM - Oxidation, Reduction and Redox Reactions
Chemistry, oxidation, reduction, redox reaction - IGCSE | IBDP | DSE | GCE | AP Chemistry
Oxidation and Reduction
2Mg + O2 → 2MgO
Magnesium becomes oxidized when it reacts with oxygen to form magnesium oxide since it has gained oxygen.
CuO + H2 → Cu + H2O
Copper(II) oxide becomes reduced when it reacts with hydrogen to form copper since it has lost oxygen.
Usually in a reaction, both oxidation and reduction happens at the same time. We call these reactions redox reactions. Oxidizing agents and reducing agents are involved in redox reactions.
2Al + Fe2O3 → 2Fe + Al2O3
In a thermite reaction,
👉Let's take a look at some questions from IGCSE Chemistry exams👈
The chemical equations for two reactions that occur during the extraction of aluminium areA: Al3+ + 3e- → AlB: C + O2 → CO2For each of these reactions, explain whether the underlined species is being oxidised or reduced.
A: Al3+ is being reduced since it gains electrons.
B: C is being oxidized since it gains oxygen.
The ionic equation for the reaction between zinc and copper(II) sulfate is
Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
Explain why this is described as a redox reaction.
A violent reaction occurs when a mixture of chromium(III) oxide and aluminium is ignited with a magnesium fuse as shown.
The equation for the reaction is shown.
Cr2O3 + 2Al → 2Cr + Al2O3
Which substance is reducing agent in the reaction?
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