Nov 2001 Chemistry SL Paper 3a_ans

Nov 2001 Chemistry SL Paper 3a_ans - INTERNATIONAL...

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MARKSCHEME November 2001 CHEMISTRY Standard Level Paper 3 13 pages N01/420/S(3)M A BACCALAUREATE BACCALAUR&AT INTERNATIONAL BACHILLERATO INTERNACIONAL
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OPTION A & HIGHER ORGANIC CHEMISTRY A1. (a) bent/V-shaped/angular 4 2 HS trigonal planar 3 3 BCl Shape of molecule Number of pairs of electrons around the central (underlined) atom Molecule [3] (Give [3] for 4 correct, [2] for 3 correct, [1 ] for 2 correct) [1] (b) (i) Double and triple bonds each count as one charge centre/pair of electrons [1] (ii) HCN linear [1] square planar 4 XeF [1] trigonal pyramid 2 3 SO Total [7] [1] A2. (a) (i) / substitution nucleophilic bimolecular N S2 C H H R Br δ+ δ− HO C OH Br H R H [1] [1] [2] Insist on negative charge ( & ) and dotted or longer bonds between C and Br and C and OH continued± & 6 & N01/420/S(3)M A
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Question A2 (a) continued [1] (ii) / substitution nucleophilic unimolecular N S1 C R R Br C R R R + R &+ & 33 +(Br ) R C OH R COH +→ [2] [1] [1] [1] (b) / 2-bromo-2-methylpropane will react faster as it is a tertiary (CH ) CBr halogenoalkane/ reacts faster than ( must have reason for mark ) N N S2 [1] C CH 3 CH 3 Br CH 3 H 2 NC 2 H 5 + C CH 3 CH 3 N CH 3 H C 2 H 5 + HBr (accept use of molecular formulas in balanced equation) Total [8] & 7 & N01/420/S(3)M A
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OPTION B & HIGHER PHYSICAL CHEMISTRY [1] B1. (a) (i) It is positive [1] Gas + solid on right hand side / particles further apart is more disordered than solid on left hand side [1] (ii) T GH S ∆= ∆− &&& [1] 1 298 174.8 100.3 48.2kJ mol 1000 × =− = + [1]
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This note was uploaded on 08/15/2011 for the course CHEM 102 taught by Professor Freeman during the Fall '08 term at South Carolina.

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Nov 2001 Chemistry SL Paper 3a_ans - INTERNATIONAL...

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