C13

Question 1

Earths atmosphere currently

Answer 1

78% nitrogen
21% oxygen
0.04% carbon dioxide

Question 2

Earths atmosphere before

Answer 2

Volcanoes released methane (CH4) ammonia (NH3) Carbon dioxide (N2) and nitrogen and water vapour

Question 3

What happened to change the atmosphere

Answer 3

1) Water vapour condensed to form the oceans
2) Carbon dioxide dissolved into oceans
3) Marine creatures use carbon dioxide to make shells so absorbed into creatures
- once died they compress into sedimentary rocks under high pressure that later form fossil fuels we use today (TRAPPED IN CARBONATE ROCKS)
4) Algae and first plants evolved to photosynthesis and absorb CO2 but release oxygen
5) Nitrogen formed from the breakdown of ammonia and methane

Question 4

equation for plants

Answer 4

water + carbon dioxide = glucose + oxygen

Question 5

The green house gases

Answer 5

water vapour , carbon dioxide and methane

- interact with infrared radiation and bonds vibrate more releasing thermal radiation

Question 6

How do humans increase green house gases

Answer 6

1) deforestation 2) burning crude oil 3) agriculture

Question 7

Complete combustion

Answer 7

Full presence of oxygen and products produced are carbon dioxide and water

Question 8

Incomplete combustion

Answer 8

not enough oxygen available therefore products produced are carbon, carbon monoxide, soots, carbon dioxide and water

Question 9

How is sulphur dioxide made

Answer 9

Whilst combustion of fossil fuels with sulphur impurities

Question 10

Sulphuric acid

Answer 10

Absorbed in clouds and released as acid rain

Question 11

Why is carbon monoxide dangerous

Answer 11

Binds with haemoglobin in the blood cells and means less oxygen available around the body

Question 12

What is a carbon footprint

Answer 12

how much carbon is produced during ur daily activities