GCSE COMBINED SCIENCE: TRILOGY PAPER 4: CHEMISTRY 2F Mark scheme Specimen 2018 Version 1.0

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Question Answers Extra information Mark AO / Spec. Ref. 01.1 dissolved carbonates in this order 1 1 AO1/1 5.9.1.2 01.2 Photosynthesis 1 AO1/1 5.9.1.3 01.3 water oxygen In this order bot... h needed for the mark 1 AO1/1 5.9.1.3 01.4 Extra lines from Gas negate the mark 3 AO2/1 AO1/1 AO1/1 5.9.1.1 01.5 increases global temperatures 1 AO1/1 5.9.2.2 01.6 use renewable energy supplies 1 AO1/1 5.9.2.4 01.7 correct reason, eg:  renewable technology underdeveloped  disagreement between countries 1 AO1/1 5.9.2.4 Total 10 MARK SCHEME – GCSE COMBINED SCIENCE: TRILOGY – CHEMISTRY PAPER 2F – SPECIMEN MATERIAL 7 of 16 Question 2 Question Answers Extra information Mark AO / Spec. Ref. 02.1 Flask 1 AO1/2 5.1.1.2, 5.7.1.2 02.2 Fractional distillation 1 AO1/2 5.7.1.2 02.3 A – boiling B – condensing in this order 1 1 AO1/2 5.2.2.1 02.4 Pentane 1 AO2/1 5.10.1.2 02.5 Formulation 1 AO1/1 5.8.1.2 02.6 the fuel is a pure compound and crude oil is a mixture or the fuel is made up of four hydrocarbons and crude oil could have many more allow crude oil contains a large number of compounds and the fuel contains four [Show More]

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