Reactions of period 3 elements with Oxygen, water and chlorine.

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Reactions of period 3 elements with Oxygen, water and chlorine:

Reactions with oxygen:

Na

tarnishes in air; burns with a yellow flame ou heating to give a mixture of the oxide and peroxide, a yellowish-white solid.

4Na(s) + O2(g) --> 2Na20(s) and 2Na(s) --> O2(g) --> Na2O2(s)

Mg

Superficial oxidation at room temperature: burns with brilliant white flame on heating. Oxide white

2Mg(S) + O2(g) --> 2MgO(s)

Al

Superfacial oxide layer forms at room temperature, which protects against further attack except by concentrated alkali, and enables the use of this relatively reactive metal for engineering purposes, Burns on heating in oxygen to give white, ionic oxide

4Al(s) + 3O2(g) --> 2Al2O3 (s)

Si

No reaction at room temperature. Burns on heating in oxygen to give white, giant covalent oxide.

Si(s) + O2(g) --> SiO2(s)

P

White phosphorus catches fire spontaneously in air: red phosphorus burns on heating, to give the white, covalent oxide of phosphorus (+5).

P4(s) +5O2(g) --> P4O10(s)

S

Burns with bright blue flame on heating in air or oxygen, giving colourless covalent gaseous oxide.

S(s) + O2(g) -->