#2.9
know the approximate percentages by volume of the four most abundant gases in dry air
#2.10
understand how to determine the percentage by volume of oxygen in air using experiments involving the reactions of metals (e.g. iron) and non-metals (e.g. phosphorus) with air
#2.11
describe the combustion of elements in oxygen, including magnesium, hydrogen and sulfur
#2.12
describe the formation of carbon dioxide from the thermal decomposition of metal carbonates, including copper(II) carbonate
#2.13
know that carbon dioxide is a greenhouse gas and that increasing amounts in theatmosphere may contribute to climate change
#2.14
practical: determine the approximate percentage by volume of oxygen in air using a metal or a non-metal