Year 13 - Reactions Of Period 3 Elements

Question 1

Name the metallic elements in period 3

Answer 1

Sodium
Magnesium
Aluminium

Question 2

Name the semi metal or metalloid in period 3

Answer 2

Silicon

Question 3

Name the non metals in period 3

Answer 3

Phosphorous
Sulfur
Chlorine

Question 4

What is the noble gas in period 3

Answer 4

Argon

Question 5

Which are the only 2 elements in period 3 that react with water

Answer 5

Sodium - reacts vigorously, large amounts of effervescence, strongly alkaline solution formed (pH 13-14)
Magnesium - reaction slow at room temp’ less alkaline than sodium as it’s sparingly soluble
Much faster when heated with steam

Question 6

How does sodium react with oxygen?

Answer 6

Burns brightly in air, yellow flame, forms white sodium oxide

Question 7

How does magnesium react with oxygen ?

Answer 7

Burns brightly in air with white flame, white magnesium oxide powder produced

Question 8

How does aluminium react with oxygen?

Answer 8

When aluminium powder is heated and then lowered into glass jar of o2 burns brightly to give aluminium oxide (white powder)

Question 9

How does silicon react in air?

Answer 9

Forms silicon oxide when heated strongly with oxygen.

Question 10

How does phosphorous react with oxygen?

Answer 10

Red phosphorous must be heated before it can react with o2. White phosphorous can react spontaneously in air with white smoke (phosphorous pentoxide). Red and white phosphorous are allotropes.

Question 11

How does sulphur react in oxygen?

Answer 11

Sulfur powder is heated and lowered into o2 burns with a blue flame to form colourless sulphur dioxide.