Reactions with oxygen

When elements react with oxygen in the air what do they produce?

Oxides

How does sodium react with oxygen?

Observation - burns with a yellow flame to produce white smoke

Solubility of the oxide - Very soluble

PH of the oxide solution - 14

How does magnesium react with oxygen?

Observation - burns with a bright white flame to produce a white solid

Solubility of oxide - sparingly soluble (not very)

PH of the oxide solution - 10

How does phosphorus react with oxygen?

Observation - burns with a white flame to produce a white smoke

Solubility - very soluble

PH of the oxide solution - 1

How does Sulfur react with oxygen?

Observation - burns pale blue flame to produce a cloudy gas

Solubility of the oxide - sparingly soluble

PH of the oxide solution - 2

Chemical equation for the reaction of sodium with oxygen

4Na + O₂ —> 2Na₂O

Chemical equation for the reaction of magnesium with oxygen

2Mg + O₂ —> 2MgO

Chemical equation for the reaction of phosphorus with oxygen

4P + 5O₂ —> P₄O₁₀

Chemical equation for the reaction of Sulfur with Oxygen

S + O₂ —> SO₂

Chemical equation for the reaction of sodium oxide with water

Na₂O + H₂O → 2NaOH

Product = sodium hydroxide (an alkali)

Chemical equation for the reaction of magnesium oxide with water

MgO + H₂O → Mg(OH)₂

Product = magnesium hydroxide (an alkali)

Chemical equation for the reaction of phosphorus oxide with water

P₄O₁₀ + 6H₂O → 4H₃PO₄

Product = phosphoric acid (an acid)

Chemical equation for the reaction of sulfur oxide with water

SO₂ + H₂O → H₂SO₃

Product = sulfurous acid (an acid)

What do metal and non metal oxide produce?

• The metal oxides are bases and produce alkaline solutions

• The non metal oxides produce acidic solutions