AQA_GCSE Trilogy Chemistry 1H_Mark Scheme 2022 | Practice Paper 1 Higher

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AQA_GCSE Trilogy Chemistry 1H_Mark Scheme 2022 | Practice Paper 1 Higher - - - -GCSE COMBINED SCIENCE CHEMISTRY MARK SCHEME Practice Paper 1 Higher - - - 1 (a) sodium fluoride 1 (b) electro... static 1 (c) conducts electricity when molten 1 high melting point 1 (d) any four from: 4 • sodium loses electron(s) • fluorine gains electron(s) • reference to one electron being transferred • (forming) positive sodium ion and negative fluoride ion • ions have complete outer shells • oppositely charged ions are attracted towards each other (e) the diagram only shows a two-dimensional representation 1 Or the diagram is not three-dimensional [9 marks] 2 (a) it goes up / increases 1 because the reaction is exothermic or transfers energy 1 to the surroundings allow gives out thermal / heat energy (b) H+ (aq) + OH−(aq) H2O(l) 1 (c) copper sulfate 1 (d) X bubbles of gas 1 Y no bubbles of gas 1 (e) calcium>magnesium>zinc>copper -- [Show More]

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