Gases in the atmosphere

Question 1

the approximate percentages by volume of the four most abundant gases in dry air

Answer 1

Nitrogen –> 78.1 %
Oxygen –> 21%
Argon –> 0.9%
Carbon dioxide –> 0.04%

Question 2

describe the combustion of elements in oxygen, including magnesium, hydrogen and sulfur

Answer 2

magnesium + oxygen → magnesium oxide
hydrogen + oxygen → water
sulfur + oxygen → sulfur dioxide

Question 3

Carbon dioxide…

Answer 3

is a greenhouse gas and that increasing amounts in the atmosphere may contribute to climate change

Question 4

Thermal decomposition of metal carbonate

Answer 4

metal carbonate –> Metal oxide + carbon dioxide