2003 Chemistry Higher Finalised Marking Instructions - eduBuzz

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Mark Scheme Worth ½ Worth 0 15. (a) hydrolysis (hydrolysing) 1 digestion or denaturing NH2 (b) (i) H C H 1 COO – BCA or CBA on rhs (ii) ACB on rhs (ignore distances; order must be correct) ABC, BAC, CAB on rhs or CBA on lhs (worth 1 mark) 2 (4) Page 22
Mark Scheme Worth ½ Worth 0 16. (a) Q = It = 0.5 x 14 x 60 (½) = 420 C (½) H2 2H + + 2e - n = 2 (½) 2 x 96 500 C 1 mol H2 (½) 420 C 0.052 litres 2 x 96 500 2 x 96 500 C x 0.052 (½) 420 = 23.895 litres (½) (– ½ for wrong or no units) 3 add a device to keep constant current (b) add variable resistor (to keep current constant) or use platinum electrodes 1 (4) [END OF MARKING INSTRUCTIONS] Page 23
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2003 Chemistry Higher Finalised Marking Instructions - eduBuzz

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