chemistry of the atmosphere exam q

Question 1

Give two reasons why the percentage of carbon dioxide has changed.

Answer 1

• used by plants]
• photosynthesis
• looked up in fossil fuels
• locked up in sedimnetary rocks or formed sedimentary rocks
• dissolved in oceans

Question 2

State how nitrogen oxides are produced in a petrol engine.

Answer 2

-high temperatures in the engne cause oxygen from the air to react with nitrogen

Question 3

) Many scientists are concerned about the carbon dioxide released from burning fossil fuels
such as petrol.
2 marks

Answer 3

carbon dioxide is a greenhouse gas which causses global warming
percentage of carbon dioxide in the atmosphere increases

Question 4

The atmosphere on Earth is very different from that on Mars. One important difference is
that the Earth’s atmosphere contains a large amount of oxygen.
Give two other ways in which the Earth’s atmosphere is different from the atmosphere
on Mars.

Answer 4

more nitrogen

less carbon dioxide