ChemHL P3 M06 TZ0 M - c IB DIPLOMA PROGRAMME PROGRAMME DU...

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c IB DIPLOMA PROGRAMME PROGRAMME DU DIPLÔME DU BI PROGRAMA DEL DIPLOMA DEL BI M06/4/CHEMI/HP3/ENG/TZ0/XX/M+ 22 pages MARKSCHEME May 2006 CHEMISTRY Higher Level Paper 3
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– 2 – M06/4/CHEMI/HP3/ENG/TZ0/XX/M This markscheme is confidential and for the exclusive use of examiners in this examination session. It is the property of the International Baccalaureate and must not be reproduced or distributed to any other person without the authorization of IBCA.
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– 6 – M06/4/CHEMI/HP3/ENG/TZ0/XX/M Option B – Medicines and drugs B1. (a) a moderate dose may induce sedation / reduce anxiety or tension / slower mental activity / slows CNS / causes drowsiness; a high dose may induce sleep / coma / unconsciousness / death; [1] Award [1] for both . (b) orange to green; 3 Cr + / chromium(III); [2] B2. (a) amphetamines / stimulants; increased heart rate / increased blood pressure / increased breathing rate / dilation of pupils / constriction of arteries / sweating / increased alertness / decreased appetite; [2] (b) (i) nicotine; [1] Accept nicotin . (ii) increased heart rate; increased blood pressure; reduced urine output; increased concentration / stimulating effect; [2 max] Award [1] each for any two . (iii) increased risk of cancer; increased risk of stroke / (coronary) thrombosis / heart disease; ulcers; emphysema/bronchitis/shortage of breath; coughing / bad breath / yellowing of teeth or fingers; effect on pregnancy; [2 max] Award [1] each for any two . B3. (a) viruses are smaller; viruses do not have nuclei/cell wall / bacteria do have nuclei/cell wall; viruses do not have cytoplasm / bacteria do have cytoplasm; viruses do not feed/excrete/grow / bacteria do feed/excrete/grow; viruses use cell material of the invaded cell to reproduce themselves; [2 max] Award [1] each for any two . (b) stops virus replication; acyclovir becomes part of DNA of virus / mimics nucleotide or guanine / alters virus DNA / prevents other nucleotides from attaching; [2] (c) if receptor site is modified/altered, HIV virus could not bind to cells; drug prevents HIV from losing the protein coat; reverse transcriptase can be blocked (to avoid converting the virus into a structure that can enter the nucleus of the host cell); the production of new viral RNA and proteins can be blocked; drug stops viruses leaving the cells; [2 max] Award [1] each for any two .
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– 7 – M06/4/CHEMI/HP3/ENG/TZ0/XX/M B4. (a) nitrous oxide is not very powerful / some side effects; ethoxyethane is flammable; halothane is potentially harmful to the ozone layer/is a CFC/is toxic; [3] (b) (i) (0.8+0.3+0.1=)1.2 atm; [1] (ii) (applying 22 2 OO O ) 0.25 total pX P X == / 1 4 / 25 %; [1] If necessary apply (U–1) to (b) . B5. one enantioner has beneficial/desired effect; the other enantiomer no effect/harmful effect/waste of material/more clinical trials necessary; thalidomide; one thalidomide enantiomer relieves symptoms of morning sickness while the other isomer can cause birth defects; Accept alternatives , e . g .
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ChemHL P3 M06 TZ0 M - c IB DIPLOMA PROGRAMME PROGRAMME DU...

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