(allow (Pb)2+ 2 (C1–) ) formula solid state symbol balancing for 1 mark each 3 (b) copper hydroxide Cu(OH)2 each for 1 mark lead sulphate PbSO4 each for 1 mark no precipitate for 1 mark Allow 1 mark for correct formula Na2SO4 in (i) 1 mark for correct formula Mg (NO3)2 in (ii) 0 marks for any formula in (iii) 5 [9] M8. awarded for this answer will be determined by the Quality of Written Communication (QWC) as well as the standard of the scientific response. No relevant content. 0 marks There is a brief description of the method or a risk assessment. Level 1 (1–2 marks) There is some description of the method that may include a risk assessment. Level 2 (3–4 marks) There is a clear, balanced and detailed description of the method and a risk assessment. Level 3 (5–6 marks) examples of the chemistry points made in the response The underlined words are needed to gain each
(allow (Pb)2+ 2 (C1–) ) formula solid state symbol balancing for 1 mark each 3 (b) copper hydroxide Cu(OH)2 each for 1 mark lead sulphate PbSO4 each for 1 mark no precipitate for 1 mark Allow 1 mark for correct formula Na2SO4 in (i) 1 mark for correct formula Mg (NO3)2 in (ii) 0 marks for any formula in (iii) 5 [9] M8. awarded for this answer will be determined by the Quality of Written Communication (QWC) as well as the standard of the scientific response. No relevant content. 0 marks There is a brief description of the method or a risk assessment. Level 1 (1–2 marks) There is some description of the method that may include a risk assessment. Level 2 (3–4 marks) There is a clear, balanced and detailed description of the method and a risk assessment. Level 3 (5–6 marks) examples of the chemistry points made in the response The underlined words are needed to gain each
c5_chemical_changes_mark_scheme.docx