ChemHL P3 N00 M

ChemHL P3 N00 M - INTERNATIONAL BACCALAURAT BACHILLERATO...

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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
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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 M r + ¥ = (. ) ( . ) ( . ) . 19 12 01 30 101 1 16 00 274 5 [1] Concentration is 0.30 which is . gdm - 3 11 10 3 . ¥ - moldm - 3 (accept ) 3 1.09 10 × - 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 ) (Give [1] for each correct name and [1] for each correct formula. Award no marks for – phenyl.) CH 65 [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
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[1] [1] C3. (a) In RNA the pentose sugar is a ribose, in DNA it is a deoxyribose (contains one less O atom). RNA contains the base uracil in place of the thymine found in DNA. (Do not accept RNA single strand, DNA double strand) [1] (b) Condensation ( accept phosphodiesterification or esterification). [1] (c) They are held together by hydrogen bonds. [2] N C C C C N O N H H H O N N C C C N C N C N H H HH H H H (Award [1] for correctly showing one or two hydrogen bonds and both marks for showing all three.) [1] [1] (d) DNA profiling is the name given to the technique that can identify an individual with a high degree of certainty from a sample of the individual’s genetic material. The lengths of each repeated sequence of bases (minisatellites) can be made visible by the use of DNA probes. [1] The probe is labelled with radioactive , mixed with the individuals’ DNA and 32 P exposed on photographic film (accept radioactive or fluorescent paint) or other suitable method of detection. [1] Forensic uses ( e.g. identifying rapists) OR paternity suits etc. – 7 – N00/420/H(3)M
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OPTION D – ENVIRONMENTAL CHEMISTRY [1] D1. (a) (do not accept 1:1000) 1000 1 : [1] (b) Sulfuric acid (accept sulfuric(IV) acid or sulfurous acid). (No mark if just the formula is given.) [1] OR SO S O 22 3 SO O SO [1] OR SO H O H SO 2 3 +→ SO H O H SO 32 2 4 [1] (c) Nitric acid (accept nitrous acid or nitric(III) acid).
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This note was uploaded on 09/04/2011 for the course CHEM 101 taught by Professor N/a during the Spring '11 term at Ohlone.

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ChemHL P3 N00 M - INTERNATIONAL BACCALAURAT BACHILLERATO...

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