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AQA_GCSE Trilogy Chemistry 2H_Mark Scheme 2022 | Practice Paper 2 Higher

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AQA_GCSE Trilogy Chemistry 2H_Mark Scheme 2022 | Practice Paper 2 Higher - - GCSE COMBINED SCIENCE: CHEMISTRY MARK SCHEME Practice Paper 2 Higher - - - 1 (a) it = water vapour 1 condensed a ... ccept temperature went below 100°C / boiling point of water allow cooled to form liquid / water / rain do not accept evaporated formed the oceans / seas 1 ignore rain accept (water vapour) cooled and formed the ocean / sea for 2 marks (b) any two from: 2 • used by (green) plants / algae accept photosynthesis / plants give out oxygen • changed into oxygen • dissolved in oceans / seas accept (locked up) in shells / skeletons (of animals) • (locked up) in carbonates / sedimentary rocks • (locked up) in fossil fuels / named fossil fuel ignore oxygen / nitrogen increased ignore reference to volcanoes / respiration - - - [Show More]

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