Chemistry · IGCSE · Edexcel · Pearson Edexcel International GCSE (9–1) Chemistry (Modular) — 4XCH1 · Specification point · 6.9 · Inorganic chemistry: Part 2 · Gases in the atmosphere
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| Learners should: |
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6.9 know the approximate percentages by volume of the four most abundant gases in dry air |