2cGases in the atmosphere

Syllabus objectives

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