inorganic chemistry - gases in the atmosphere

Question 1

percentage by volume of nitrogen in dry air

Answer 1

78.1%

Question 2

percentage by volume of oxygen in dry air

Answer 2

21%

Question 3

percentage by volume of argon in dry air

Answer 3

0.9%

Question 4

percentage by volume of carbon dioxide in dry air

Answer 4

0.04%

Question 5

what happens in reaction of oxygen and magnesium

Answer 5

produces a bright white flame, leaving behind a white ash which is magnesium oxide

magnesium + oxygen –> magnesium oxide
2Mg + O2 –> 2MgO

Question 6

what happens in reaction of oxygen and sulphur

Answer 6

produces a blue flame

sulphur + oxygen –> sulphur dioxide
S +O2 –>SO2

Question 7

what happens in reaction of oxygen and hydrogen

Answer 7

creates an explosive reaction (squeaky pop test)

hydrogen + oxygen –> water
2H2 + O2 –> H2O

Question 8

what does thermal decomposition of metal carbonates make?

Answer 8

metal oxides and carbon dioxide

Question 8

what is thermal decomposition

Answer 8

to process of breaking down by heating

Question 9

how does CO2 cause climate change?

Answer 9

it absorbs infra-red radiation and therefore warms the atmosphere.