Gases of the air - The atmosphere

Question 1

Which gases make up the air?

Answer 1

• Carbon dioxide
• Argon
• Oxygen
• Nitrogen
• Water Vapour
• other gases

Question 2

What percentage does carbon dioxide take up in air?

Answer 2

0.04%

Question 3

What percentage does argon take up in air?

Answer 3

0.9%

Question 4

What percentage does oxygen take up in air?

Answer 4

21%

Question 5

What percentage does nitrogen take up in air?

Answer 5

78%

Question 6

What percentage does water vapour take up in air?

Answer 6

variable

Question 7

What percentage does other gases take up in air?

Answer 7

0.06%

Question 8

What is the formulae of nitrogen?

Answer 8

N2

Question 9

What is the formulae of oxygen?

Answer 9

O2

Question 10

What is the formulae of carbon dioxide?

Answer 10

CO2

Question 11

What is the formulae of water?

Answer 11

H2O

Question 12

What is the formulae of argon?

Answer 12

Ar

Question 13

Explain how the first 4.5 billion years went?
[ Phase 1 ]

Answer 13

Volcanic activity produced, carbon dioxide [ CO2 ] rich atmosphere. Water vapour, nitrogen, methane + ammonia. Water vapour cooled and condensed and formed oceans. A lot of the CO2 dissolved in the oceans then formed carbon precipitate, then sediments on the sea bed
* Ammonia reacted to the oxygen, and that formed nitrogen + water

Question 14

Explain how 2.7 billion years ago went?
[ Phase 2 ]

Answer 14

Green algae then plants evolved + they photosynthesise. The amount of carbon dioxide [ CO2 ] went down and the amount of water [ H2O ] went up.
* Sedimentary rocks = big store of carbon

Question 15

Explain how 1 billion years ago went?

Answer 15

Ozone layer formed, it filtered out any harmful UV light to allow more complex animals to evolve.

Question 16

Explain how today’s atmosphere is going?

Answer 16

The carbon dioxide dissolved into the oceans, forming precipitate + shells of sea creatures + carbonate rocks.