Chemistry - Chapter 7 (P2)

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What caused the proportion of oxygen in the atmosphere to increase?
Photosynthesis
1 of 17
What gases are present in atmosphere today?
Nitrogen, oxygen, argon and carbon dioxide
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Which is the most abundant gas in the atmosphere?
Nitrogen
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Which was the most abundant gas in the early atmosphere?
Carbon dioxide
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What is the approximate percentage of nitrogen in the atmosphere today?
78%
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What is the approximate percentage of oxygen in the atmosphere today?
21%
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What is the approximate percentage of argon in the atmosphere today?
1%
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What is the approximate percentage of carbon dioxide in the atmosphere today?
0.04%
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What were the first two gases in the early atmosphere?
Helium and hydrogen
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What is the reason for the decrease in carbon dioxide in the Earth's atmosphere?
It's locked up in fossil fuels and sedimentary rocks
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The oceans were formed when _______ condensed?
Steam/Water Vapour
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In Earth's early atmosphere what was the surface made of?
Molten
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What gases did volcanoes give out in Earth's early atmosphere?
water vapour, carbon dioxide, methane, ammonia
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When was the Earth formed; according to scientists?
4.5 billion years ago
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What is condensation?
Is when a gas changes/turns into a liquid
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What is evaporation?
Is when a liquid changes/turns into a gas
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Describe how the oxygen was formed.
By the plants through photosynthesis
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Card 2

Front

What gases are present in atmosphere today?

Back

Nitrogen, oxygen, argon and carbon dioxide

Card 3

Front

Which is the most abundant gas in the atmosphere?

Back

Preview of the front of card 3

Card 4

Front

Which was the most abundant gas in the early atmosphere?

Back

Preview of the front of card 4

Card 5

Front

What is the approximate percentage of nitrogen in the atmosphere today?

Back

Preview of the front of card 5
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