SCIENCE 101 > GCSE MARK SCHEME > Mark Scheme (Provisional) Summer 2021 Pearson Edexcel International GCSE In Science (Single Award) ( (All)

Mark Scheme (Provisional) Summer 2021 Pearson Edexcel International GCSE In Science (Single Award) (4SS0) Paper 1C/ Graded A+

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Question number Answer Notes Marks (a) (paper) chromatography 1 1 (b) (i) B filtration A is incorrect as P is not used for crystallisation C is incorrect as P is not used for fractional distillat... ion D is incorrect as P is not used for simple distillation 1 (ii) (iii) C fractional distillation A is incorrect as S is not used for crystallisation B is incorrect as S is not used for filtration D is incorrect as S is not used for simple distillation evaporating basin/dish ALLOW evaporating bowl 1 1 Total 4 http://britishstudentroom.wordpress.com/Question number Answer Notes Marks 2 (a) (i) (ii) (iii) (iv) (v) (vi) 3/three nucleus 1/one 2/two lithium +1/1+ ALLOW nuclei ALLOW alkali metals IGNORE Li ALLOW +/plus/positive 1 1 1 1 1 (b) (i) M1 atoms (of the same element) with same atomic number/ same number of protons M2 but different mass numbers/different number of neutrons REJECT molecules/ compound once only 2 (ii) M1 (6 x 7.8) + (7 x 92.2) OR 692.2 M2 692.2 ÷ 100 = 6.9 OR answer to M1 ÷ 100 ACCEPT 6.92/6.922 An answer of 7 with working scores 1 2 An answer of 7 without any working scores 0. Total 10 http://britishstudentroom.wordpress.com/Question number Answer Notes Marks 3 (a) (i) (ii) halogens B bromine A is incorrect as astatine is a solid at room temperature C is incorrect as fluorine is a gas at room temperature D is incorrect as iodine is a solid at room temperature 1 1 (iii) C green A is incorrect as chlorine is not brown 1 B is incorrect as chlorine is not colourless C is incorrect as chlorine is not red (iv) M1 (damp) litmus paper M2 bleached ALLOW universal indicator paper/ pH paper ALLOW turns white 2 ACCEPT (damp) blue litmus paper turns red and then bleached for both marks. (b) (i) M1 use of 56 and 35.5 in calculation M2 162.5 91.5 without working scores 1 2 correct answer without working scores 2 (ii) 2 Fe + 3 Cl2  2 FeCl3 ALLOW multiples and fractions [Show More]

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