Chem 6_6 Air

Air is

• a mixture of gases

• a mixture of elements

• a mixture of compounds

• a mixture of solids

Nitrogen is used to filll spaces in _____ to prevent fire

• durians

• classroom

• oil tank

• balloon

Oxy-acetelene and _____ flames are used for cutting and welding metals

• oxy-carbon

• oxy-hydrogen

• oxy-helium

• oxy-oxygen

Carbon dioxide dissolves in water to form ______ acid

• carbonic

• dioxidic

• bicarbonic

• carboonic

_____ is a poisonous gas

• Nitrogen

• Hydrogen

• Carbon dioxide

• Carbon monoxide

The gas released from the exhaust of vehicles is the ______

• carbon monoxide

• carbon dioxide

• carbonic acid

• nitrogen gas

Oxygen exists as a _______ molecules

• diatomic

• monotomic

• triatomic

• single

Which is true about the air?

• Air coolss the Earth by day and cools at night

• Air cools the Earth by day and warms at night

• Air warms the Earth by day and cools at night

• Air warms the Earth by day and warms at night

Nitrogen is more soluble in water than oxygen

• No, they have same solubility

• Yes nitrogen and oxygen have different solubility

• Yes nitrogen is more soluble than oxygen

• Yes nitrogen is more soluble than water

Smog is a mixture of _____ and _____

• smoke and fog

• smoke and fox

• smoke and ashes

• smoke and frog