We write down the equations of combustion reactions with the following compounds: Potassium, sodium, phosphorus (+5), aluminum, lithium, calcium.
2 K + O2 -> K2O2.
When potassium burns, that is, when it reacts with oxygen, the result is potassium peroxide.
2 Na + O2 -> Na2O2.
When sodium burns, that is, when oxygen acts on sodium, the result is sodium peroxide.
4 P + 5O2 -> 2P2O5.
That is, when pentavalent phosphorus burns, the result is pentavalent phosphorus oxide.
4Al + 3O2 -> 2Al2O3.
When aluminum burns, the result is aluminum oxide.
4Li + O2 -> 2Li2O.
When lithium is burned, lithium oxide is formed.
2Ca + O2 -> 2CaO.
When calcium burns, calcium oxide is formed.
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