| (c) Gases in the atmosphere |
| 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 the atmosphere may contribute to climate change |
| 2.14 know how to determine the approximate percentage by volume of oxygen in air using a metal or a non-metal |
