2. Period 3 elements reacting with oxygen

What do period 3 elements form when they react with oxygen?

Oxides

Period 3 elements are usually oxidised to their… oxidation states.

highest

What is the exception to period 3 elements being oxidised to their highest oxidation states. Give it’s example.

• Sulfur, it forms SO2 with a +4 oxidation state. The highest oxidation state for sulfur is +6.

What is needed for sulfur to be oxidised to its highest oxidation state? What is the formula?

high temperature

catalyst

SO3 with an oxidation state of +6

The more reactive metals (Na, Mg) and the non-metals (P,S) react … in air while Al and Si react more slowly.

readily

General formula of the formula for the making of all period 3 oxides.

element + oxygen → oxide

word and symbol equation for:

Na and O2

Reaction in air:

Flame colour:

sodium + oxygen → sodium oxide

Reaction in air: Vigorous

Flame colour: Yellow

word and symbol equation for:

Mg, O2

Reaction in air:

Flame colour:

magnesium + oxygen → magnesium oxide

Reaction in air: Vigorous

Flame colour: Brilliant white

word and symbol equation for:

Al, O2

Reaction in air:

Flame colour:

aluminium + oxygen → aluminium oxide

Reaction in air: Slow

Flame colour: N/A

word and symbol equation for:

Si, O2

Reaction in air:

Flame colour:

silicon(s) + oxygen(g) → silicon dioxide(s)

Reaction in air: Slow

Flame colour: N/A

word and symbol equation for:

P, O2

Reaction in air:

Flame colour:

phosphorus + oxygen → phosphorus(V) oxide

P4(s) + 5O2(g) → P4O10(s)

Reaction in air: Spontaneously combusts

Flame colour: Brilliant white

word and symbol equation for:

S, O2

Reaction in air:

Flame colour:

sulfur + oxygen → sulfur dioxide

S(s) + O2 (g) → SO2 (g)

Reaction in air: Burns steadily

Flame colour: Blue