Chem HL P3 2001 Markscheme

Chem HL P3 2001 Markscheme - INTERNATIONAL BACCALAURAT...

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MARKSCHEME May 2001 CHEMISTRY Higher Level Paper 3 16 pages M01/420/H(3)M INTERNATIONAL BACCALAUREATE BACCALAUR&AT INTERNATIONAL BACHILLERATO INTERNACIONAL
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OPTION C & HUMAN BIOCHEMISTRY [1] C1. (a) Chemical messenger / OWTTE [1] (b) (i) Testes (Note: Do not award [1] for ovaries, since in humans the production of testosterone by the ovaries is extremely low in comparison with the testes.) (ii) Use ( e.g. treatment of wasting illness / to regain muscle tissue, treatment of eczema) [1] ; Abuse ( e.g. increase muscle mass to enhance performance / increase strength) [1] ; Second use or second abuse [1] . [3 max] (c) Two groups circled correctly [1] ; Two correct corresponding names [1] . Accept any two from the following: ! Alkanol / alcohol / hydroxyl; ! Alkene; ! Alkanone / ketone / carbonyl. (Do not accept / methyl / alkyl group or &hydroxide±) 3 CH [2 max] (d) Allow any one from: ! Cholesterol has an OH group instead of the group in testosterone; CO == ! Cholesterol has an alkyl/hydrocarbon side-chain instead of the OH group in testosterone; ! There is no carbonyl group present in cholesterol; ! The position of the bond is different in cholesterol compared to CC testosterone. (Or any other correct answer, relating to structural differences.) [1 max] & 6 & M01/420/H(3)M
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[1] C2. (a) Glycerol / propane-1,2,3-triol (accept correct structure) . [1] (b) Fatty acid(s) / salt of acid / soap / carboxylic acid / alkanoic acid / carboxylate. [1] (c) Heat with base / alkali / KOH / NaOH ( both needed ). (d) Heat produced (can be scored by implication) [1] ; (mass specific heat capacity ) T × [1] ; (500 4.18 67.5) × / 141075 J [1] . 141.075 = Calorific value of bar ; 50.0 141.075 10.0 [1] . 705.4 (kJ) / 705 (kJ) (accept correct value in J) = [4 max] C3. (a) Hydrogen bond [1] ; Two H-bonds shown between T and A [1] ; Three H-bonds shown between C and G [1] ; Deoxyribose and phosphate ( both needed ) [1] ; ! Phosphate on one nucleotide bonds to (OH of) deoxyribose on the next nucleotide [1] ; ! Condensation reaction / by covalent bonding [1] . [6 max] (b) Award [1] each for any four of the following points: ! Separate DNA from other material [1] ; ! Cut DNA up (using restriction enzymes) [1] ; ! Separate by electrophoresis [1] ; ! Method of detection ( e.g. UV, radioactive probe, X-ray) [1] . [4 max] & 7 & M01/420/H(3)M
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OPTION D & ENVIRONMENTAL CHEMISTRY [1] D1. (a) Water / CFCs / dinitrogen oxide ( ).
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Chem HL P3 2001 Markscheme - INTERNATIONAL BACCALAURAT...

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