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AQA GCSE Chemistry > 9. Chemistry Of The Atmosphere > Flashcards

9. Chemistry Of The Atmosphere Flashcards

1
Q

What percentage of nitrogen is in the atmosphere today?

A

78%

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2
Q

What percentage of oxygen is in the atmosphere today?

A

21%

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3
Q

What percentage of carbon dioxide is in the atmosphere today?

A

0.03%

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4
Q

What percentage of noble gases are in the atmosphere today?

A

1%

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5
Q

What was phase 1 of evolution of the atmosphere?

A

Volcanoes gave out gases

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6
Q

What was phase 2 of evolution of the atmosphere?

A

Green plants and algae absorbed carbon dioxide

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7
Q

What was phase 3 of evolution of the atmosphere?

A

Green plants and algae produced oxygen

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8
Q

What is the greenhouse effect?

A

UV radiation warms the earth surface -> earth emits infrared -> some gets trapped in earths atmosphere and some is remitted

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9
Q

What has a carbon footprint?

A

Pretty much everything

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10
Q

How to reduce carbon footprint?

A

Walk, eat less meat, use less electricity

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11
Q

What is the evidence for global warming?

A
  • CO2
  • Methane -> 2nd most abundant - produced by cows and sheep
  • Nitrous oxide -> 3rd and produced by soil which is used more containing bacteria
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12
Q

What percentage does carbon dioxide contribute to global warming?

A

60%

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13
Q

What percentage does methane contribute to global warming?

A

16%

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14
Q

What percentage does nitrous oxide contribute to global warming?

A

4%

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15
Q

What percentage do other synthetic gases contribute to global warming?

A

10%

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16
Q

Is combustion an exothermic reaction?

A

Yes

17
Q

What does combustion produce?

A

Carbon dioxide and water

18
Q

What does incomplete combustion produce?

A

Carbon monoxide and water or carbon and water (soot)

19
Q

What are potentially harming products combustion?

A

Water vapour, carbon dioxide, carbon monoxide and unburnt carbon

20
Q

Why is carbon a harming effect of combustion?

A

Un burnt carbon is a particulate and a pollutant in the air

21
Q

Why is carbon monoxide a harming effect of combustion?

A

It is toxic and has no smell

AQA GCSE Chemistry (10 decks)

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