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Chemistry · 2000 · November · Paper 3 · HL · Markscheme

ChemistryMarkscheme2000HLNovember

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This markscheme is listed under Chemistry in the 2000 examination archive. Its catalogue level is HL. The catalogue session is November. The information below helps you identify the document before opening the complete PDF. Subject, year and session labels come from the archive catalogue; the original cover remains the reference if a label differs. A file is not automatically suitable for your current syllabus simply because its subject name matches.

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MARKSCHEME November 2000 CHEMISTRY Higher Level Paper 3 N00/420/H(3)M INTERNATIONAL BACCALAUREATE BACCALAURÉAT INTERNATIONAL BACHILLERATO INTERNACIONAL 15 pages OPTION C – HUMAN BIOCHEMISTRY [2] C1. (a) Retinol will contain an —OH (alkanol) group ( [1]). Retinal will contain a —CHO (alkanal) group ([1]). (If both alkanol and alkanal are given but no structures award [1]) [1](b) Two pairs of electrons (four electrons) between the two carbon atoms. [1](c) for retinol Mr =¥ +¥ + ¥ =(. ) ( . ) ( . ) .19 12 01 30 101 1 16 00 274 5 [1]Concentration is 0.30 which is .gd m-3 11 10 3. ¥ - mol dm-3 (accept ) 31.09 10 −× mol dm-3 [1] [1] (d) More fat soluble. Because the polar O—H bond will be insignificant compared to the bulky non-polar ‘tail’ of the molecule. OR Because there is a very low concentration (of retinol in the blood). OR Non-polar hydrophobic chain will be more soluble in fat than polar water. [1]C2. (a) Iodine. [4](b) Any two from: acid, —COOH; amine, ; alkoxyalkane (ether), —O—; —NH 2 (do not accept amide for 2—NH ) (Give [1] for each correct name and [1] for each correct formula. Award no marks for – phenyl.)CH65 [1] [1] (c) Hormones are chemical messengers OR substances that regulate bodily processes such as growth and metabolism. Hormones are transported by the blood stream. [1] (d) Thyroxine regulates the rate at which cells use oxygen OR controls the rate of carbohydrate metabolism OR controls rate of protein synthesis and breakdown OR stimulates energy production in cells. – 6 – N00/420/H(3)M
File information
Subject
Chemistry
Document type
Markscheme
Year
2000
Session
November
Level
HL
Paper
3
Examination zone
Not labelled in the archive
Language
Not labelled in the archive
File size
42 KB
Pages
11
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