Period 3 Oxides

Question 1

Reactions of Period 3 Elements with Oxygen

Answer 1

With a catalyst and high temps -

2S (s) + 3O2 (g) → 2SO3 (g)

Question 2

Melting points of Period 3 Oxides explained and graphed

Answer 2

Na2O, MgO and Al2O3
- Ionic
- Giant lattice, high melting points

SiO2
- Giant covalent molecule
- High melting point

P4O10 and SO2 / SO3
- Small, simple covalent
- Weak intermolecular forces of attraction between them
- Low melting point

Question 3

Summary Table of the Physical Properties of Period 3 Oxides

Answer 3

Question 4

Reaction with Water and Period 3 Oxides

Answer 4

P4O10 and SO2 and SO3 are purely covalent, so produce acidic solutions, form an acid donating H+ ions

Al2O3 and SiO2, when reacted with hot concentrated alkaline solution act as a base and form a salt.

Al2O3 can also react with acidic solutions forming salt + water (amphoteric character lets it do this)

Question 5

Testing Period 3 Oxides. Results.

Answer 5

• React period 3 elements with Oxygen