Chem HL P2 2001 Markscheme

Chem HL P2 2001 Markscheme - INTERNATIONAL BACCALAURAT...

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MARKSCHEME May 2001 CHEMISTRY Higher Level Paper 2 14 pages M01/420/H(2)M INTERNATIONAL BACCALAUREATE BACCALAUR&AT INTERNATIONAL BACHILLERATO INTERNACIONAL
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SECTION A [1] 1. (a) (i) Tl [1] (ii) (accept Mn) 2 Mn + [1] (iii) Any two of N, P, As, Sb, Bi [3 max] (b) Lines (may be shown on diagram) [1] Convergence at high frequency / energy / short wavelength (may be shown on a diagram) [1] Electron transfer between energy levels / each transition / line depends on energy differences / [1] Eh υ ∆= [2 max] (c) remaining electrons in one shell / has one less shell or converse [1] Li + effective nuclear charge ( ) greater than that of the atom [1] + [2 max] (d) Any two of the following, [1] each ! Do not form bonds ! Full outer shells ! No attraction for electrons ! Stable / inert / do not react 2. (a) [1] 2 0.667 0.6666 0.3332 No. of moles [1] Divide by values r A H N Cl Pt [3 max] Empirical formula [1] 226 PtCl N H [1] (b) Accept any diagram that shows two Cl atoms attached to Pt and two groups 3 NH attached to Pt. (Allow ECF from (a)). [4 max] (c) Moles of [1] 3 AgNO 0.0162 0.102 0.00165 = Moles of [1] NaCl 0.0148 0.125 0.00185 = Therefore limiting reactant is moles AgCl produced [1] 3 AgNO / 0.00165 Mass of AgCl produced (accept values in range 0.00165 143.32 0.236g = 0.236 - 0.237 g) [1] If the wrong limiting reagent is used (NaCl), 0.265 g scores [3] . (N.B. Error carried forward; other routes are possible for the deduction that is limiting / moles ) 3 AgNO AgCl = moles 3 AgNO & 6 & M01/420/H(2)M
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[2 max] 3. (a) (i) Energy / enthalpy change for the formation of 1 mol of a compound [1] from its elements in their standard states / 101 kPa, 298K [1] [1] (ii) 23 8 3C(s) + 4H (g) C H (g) [5 max] (b) (i) Reference to (particular) bonds in a range of compounds / average values [1] Break or make 1 mole of bonds in gaseous state [1] [2(C&C) 8(C&H) 5(O O)] [6(C O) 8(O&H)] =+ + = = = = + [1] * [2(348) 8(412) 5(496)] [6 (743) 8 (463)] +−+ [1] ( units not required ) 1690 =− (N.B. correct extraction of five bond enthalpy values (even with wrong coefficients) would score [1] ) [2 max] (ii) Positive [1] Increase in disorder / less order / more gas (on RHS) [1] [2 max] 4. (a) (i) Any two of the following, [1] each Some mention of a reversible reaction / l etc.
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Chem HL P2 2001 Markscheme - INTERNATIONAL BACCALAURAT...

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