c1

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How do scientists think the Earth's early atmosphere was formed?
Scientists think that the Earth's early atmosphere was formed from gases produced by erupting volcanoes.
1 of 17
Which gas in the Earth's early atmosphere gradually became 'locked up' in carbonate rocks?
Carbon dioxide gas in the Earth's early atmosphere gradually became 'locked up' in carbonate rocks.
2 of 17
How did the evolution of primitive green plants about one billion years ago affect the atmosphere
About one billion years ago primitive green plants started to evolve. Photosynthesis converted carbon dioxide into oxygen and so over time the concentration of carbon dioxide decreased and the concentration of oxygen increased.
3 of 17
Explain how the formation of fossil fuels reduced the amount of carbon dioxide in the early atmosphere.
The formation of fossil fuels reduced the amount of carbon dioxide in the early atmosphere because carbon that had been converted into plant tissue during photosynthesis became 'locked up'.
4 of 17
Name the two gases that make up 99% of the atmosphere today.
Nitrogen makes up 78% and Oxygen makes up 21%.
5 of 17
Which gas is released into the atmosphere when fossil fuels are burned?
Carbon dioxide is released into the atmosphere when fossil fuels are burned.
6 of 17
State the law of conservation of mass.
The law of conservation of mass states that the total mass of the products at the end of a reaction is the same as the total mass as the reactants at the start of the reaction.
7 of 17
What happens in a precipitation reaction?
In a precipitation reaction two solutions react to form an insoluble precipitate.
8 of 17
Name the two products that are formed from the complete combustion of hydrocarbons.
Carbon dioxide and water are the two products of complete combustion of Carbon dioxide.
9 of 17
Name two other products that are formed if there is not enough oxygen available for the complete combustion of a hydrocarbon.
Carbon and Carbon monoxide are two other products formed if there is not enough oxygen available for the complete combustion of a hydrocarbon.
10 of 17
Explain how Carbon monoxide is a very toxic gas.
If Carbon monoxide is breathed in it attaches to the red blood cells which prevent them from carrying oxygen around the body.
11 of 17
Write a symbol equation to show the formation of sulphur dioxide gas when sulphur burns.
S(s) + O2(g) ---> SO2(g)
12 of 17
What problem does Sulphur dioxide cause when it is released into the atmosphere?
When Sulphur dioxide is released into the atmosphere it dissolves in water vapour in clouds to form dilute sulfuric acid which then falls as acid rain.
13 of 17
Give two harmful effects of acid rain.
Two harmful effects include: acidifies rivers and lakes which kill fish and other organisms, washes minerals from the soil and releases toxic metals, damages tree leaves which can lead to eventual death of trees and forests.
14 of 17
Explain how spraying the flue gases of power stations with seawater droplets removes Sulphur dioxide.
Spraying the flue gases of power stations with seawater droplets removes sulphur dioxide because the droplets are naturally alkaline and react with the sulphur dioxide to form dissolved sulphate salts.
15 of 17
What are bio-fuels?
Bio-fuels are fuels made from plants and animals.
16 of 17
Give two advantages of producing ethanol as a bio-fuel.
Two advantages of producing ethanol as a bio-fuel are it is renewable and carbon neutral.
17 of 17

Other cards in this set

Card 2

Front

Which gas in the Earth's early atmosphere gradually became 'locked up' in carbonate rocks?

Back

Carbon dioxide gas in the Earth's early atmosphere gradually became 'locked up' in carbonate rocks.

Card 3

Front

How did the evolution of primitive green plants about one billion years ago affect the atmosphere

Back

Preview of the front of card 3

Card 4

Front

Explain how the formation of fossil fuels reduced the amount of carbon dioxide in the early atmosphere.

Back

Preview of the front of card 4

Card 5

Front

Name the two gases that make up 99% of the atmosphere today.

Back

Preview of the front of card 5
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