4. Period 3 oxide reactions with water

What happens to the O2- ions in the sodium and magnesium oxides, when these compounds react with water?

• The O2- ions accept protons from the water molecules to form hydroxide ions.

Which compound has a higher alkalinity?

2NaOH because it is more soluble in water and so therefore forms a more alkaline solution.

Word and symbol equation for sodium oxide with water.

sodium oxide + water → sodium hydroxide

Na2O (s) + H20 (l) → 2NAOH(aq)

Word and symbol equation for magnesium oxide with water.

magnesium oxide + water → magnesium hydroxide.

Mg0 (s) + H20 (l) → Mg(OH)2 (aq)

What is produced when non-metals react with water?

Acids

Phosphor with water:

1. Word equation

2. Symbol Equation

3. Dissociation of Period 3 acid in water.

2. Phosphoric(V) acid

3. H3PO4(aq) → 3H+ (aq) + PO43- (aq)

Sulfur dioxide with water

1. Word equation

2. Symbol Equation

3. Dissociation of Period 3 acid in water.

2. sulfurous aicd

3. H2SO3 (aq) → 2H+ (aq) + SO3 2- (aq)

Sulfur trioxide with water

1. Word equation

2. Symbol Equation

3. Dissociation of Period 3 acid in water.

2. sulfuric (VI) acid

3. H2SO4 (aq) → 2H+ (aq) + SO4 2- (aq)

why is silicon dioxide classified as an acid?

• due to it’s giant covalent structure, it is insoluble, but it still reacts with bases to form salts, so it is therefore classified as an acid.

what is aluminium oxide knows as?

amphoteric

amphoteric meaning

it can act as a acid or base. partially ionic and covalently bonded.