Nitrogen makes up ______________ of the air around us.

The percentage of oxygen in the air is __________

The main components of air can be separated by the process of ________________________________________________

Presence of carbon dioxide can be identified using

• anhydrous copper(II) sulfate

• acidified potassium dichromate solution

• limewater

• hydrated copper(II) sulfate

• limestone

Presence of water can be identified using

• anhydrous copper(II) sulfate

• hydrated copper(II) sulfate

• cobalt chloride paper

• limewater

• limestone

Nitrogen is highly inert due to the presence of a

Nitrogen has a higher melting point than oxygen.

• True

• False

To collect nitrogen from the air in the lab, the oxygen can be removed by reacting it with

• a sodium hydroxide solution

• copper turnings

• water

• a calcium chloride solution

Nitrogen in the lab can be collected in TWO ways

• upward delivery

• downward delivery

• over water

• test tube

____________ are responsible for the destruction of the ozone layer.

• Chlorofluorocarbons

• Hydrofluorocarbons

• Chlorocarbons