Gases in the atmosphere

Question 1

Amount of Nitrogen in atmosphere

Answer 1

78%

Question 2

Amount of oxygen in atmosphere

Answer 2

21%

Question 3

Amount of argon in atmosphere

Answer 3

0.09%

Question 4

Amount of carbon dioxide in atmosphere

Answer 4

0.04%

Question 5

How do you measure proportion of oxygen in the atmosphere using iron?

Answer 5

Soak iron wool in acetic acid, then push wool in to measuring cylinder and invert it into a beaker of water.
Record starting position of water.
Leave measuring cylinder for about a week
Measure the final height of water.
Put them into percentage change formula.

Question 6

How can you use phosphorus to determine the percentage of oxygen in the air?

Answer 6

Place phosphorus in a tube and attach a glass syringe at either end.
Make sure one is full of air and the other is empty. Heat phosphorus and use syringes to pass the air over it.
Phosphorus oxide will be produced.
As it reacts, amount of air in cylinders decreases.
Measure starting and final volumes of air using the scale on one of the syringes
Calculate percentage of volume in the air using percentage change formula.

Question 7

What happens if you heat a metal carbonate?

Answer 7

You get carbon dioxide and a metal oxide

Question 8

How does deforestation contribute to the greenhouse effect?

Answer 8

Fewer trees means less CO2 is removed from the atmosphere via photosynthesis.

Question 9

How does burning fossil fuels contribute to the greenhouse effect?

Answer 9

Carbon that was locked up in these fuels is being released as CO2.