air & oxides

Air is classified as a__________.

• substance

• mixture

This gas makes up 78% of air.

• carbon dioxide

• nitrogen

• oxygen

• water vapor

Which gas found in air is an important part of the process of photosynthesis?

• carbon dioxide

• oxygen

• nitrogen

• water vapor

This gas makes up 21% of air.

• carbon dioxide

• nitrogen

• oxygen

• water vapor

This gas makes up 0.04% of air.

• carbon dioxide

• nitrogen

• oxygen

• water vapor

What does an ionic compound consist of?

(CHECK ALL THAT APPLY)

• Cations

• Anions

• Positive ions

• Negative ions

How are metal oxides formed?

• When metals react with oxide.
• When metals react with water.
• When metals react with air.
• When metals react with oxygen.

Which of the following is the product of the reaction of aluminium and oxygen?

• aluminium oxide.
• metal oxide
• aluminium ore
• aluminium and oxygen

Which of the following reactions produces calcium oxide?

• calcium and oxide
• calcium and water
• calcium and air
• calcium and oxygen

What gas from the air reacts with metal when it is burnt?

• hydrogen

• oxygen

• methane

• magnesium