Paper 1 2014 January

Question 1

Uses of nitrogen?

Answer 1

Manufacture of ammonia
Food packaging
Coolant/refrigerant/freezing agent
Lightbulbs

Question 2

Name the gas present in polluted air that causes acid rain?

Answer 2

Nitrogen dioxide

Sulphur dioxide

Question 3

Write the word equation for rust?

Answer 3

iron + oxygen + (water) –> hydrated iron (III) oxide

Question 4

Why is ethanol used instead of water in extraction of rose petal colouring?

Answer 4

Rose petal colouring dissolve in ethanol as opposed to water.

Question 5

Ethanol is a flammable liquid. Suggest how it could be heated safely?

Answer 5

Water bath
Electric Heater
Isomantle

Question 6

Suggest two observations that would be made when excess CO2 is bubbled through limewater

Answer 6

Cloudy

Then Clear

Question 7

Similarities between lithium and potassium when they react with water?

Answer 7

• floats
• moves around
  -fizzes/effervesces/bubbles/produces
  gas/produces hydrogen
• disappears/dissolves
• forms a solution

Question 8

Differences between lithium and potassium when they react with water?

Answer 8

• More vigorous/moves around faster/reacts faster/fizzes/explodes
• Flame/catches fire
• Forms a ball/bead/melts