Chemistry 2 Scheme | Properties Of Water | Carboxylic Acid

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CONFIDENTIAL* 962/2 1 CHEMISTRY MARKING SCHEME STPM TRIAL 2012 1 (a) (i) N : 1s 2 2s 2 2p 3 [1] (ii) NCl 3 PCl 5 NCl 3 : Polar molecule PCl 5 : non-polar molecule [1]+[1] [1]+[1] (iii) Overlapping orbital of N 2 H 4
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  CONFIDENTIAL* 962/2   1 CHEMISTRY MARKING SCHEMESTPM TRIAL 20121 (a) (i) N : 1s 2 2s 2 2p 3 [1](ii)NCl 3 PCl 5  NCl 3 : Polar molecule PCl 5 : non-polar molecule[1]+[1][1]+[1](iii)Overlapping orbital of N 2 H 4  Label the hybrid orbitalShow overlappingLabel sigma( σ ) bond[1][1][1](b) (i)[1]+[1]TOTAL MARKS 10Increasing frequencyNNHHHH σ   σ   σ   σ     P   ã  x ã  x ã x   ã x   ã x   ClClCl ClCl ã ã   ã ã   ã ã   ã ã   ã ã   ã   ã   ã   ã   ã   ã   ã   ã   ã   ã   ã   ã   ã   ã   ã   ã   ã ã   ã ã  P ã  x ã x ã xx x ã   ã   ãã     ãã   ãã   ãã   ãã   ã   ã   ã   ã   ã   ã   N ClClCl  CONFIDENTIAL* 962/2   2 2 (a) (i)[1][1](ii)Direction of electron flow from Cu(s) to Ag(s) (must be in/close to wire)[1](iii)Cu(s)  Cu 2+ (aq)// Ag + (aq)  Ag(s)[1](iv)Cu(s) + 2Ag + (aq)  Cu 2+ (aq) + 2Ag(s)[1](v)E ocell = (  –  0.34) + ( +0.80) or= + 0.46 V[1](vi)Nernst Equation   22 ][][log2059.0    AgCu E  E  ocellcell  or V  40.010.000.1log2059.0)46.0( 2       [1][1](c)Standard electrode potential for chlorine is more positive than Fe 3+  therefore it is a better oxidising agent than Fe 3+ (do not accept E o islarger or smaller)Standard electrode potential for iodine is less positive than Fe 3+  therefore it is a poorer oxidising agent than Fe 3+ .(Accept release of electrons/equilibrium arguments)Or calculation[1][1]TOTAL MARKS 10  CONFIDENTIAL* 962/2   3 3 (a) (i) An ion which formed when a metallic ion is bonded to a group of ligandby dative bonds[1][1](ii) Ligand that can donate more than one lone pair electrons [1](b) (i)[Cu(H 2 O) 6 ] 2+ ; [Cu(H 2 O) 4 (OH) 2 ] ; [Cu(NH 3 ) 4 ] 2+  3 corrects2 corrects[2][1](ii) H 2 O < OH - < NH 3  A stronger ligand is able to displace a weaker ligand from the complexion[1][1](iii) Transition metal ions have incomplete 3d-subshell / d 1 to d 9  d-d electronic transition is possiblenon transition metal / other metal have either completely filled 3d orbitals orno 3d electron or no d-d electronic transition [1][1][1]TOTAL MARKS 10  CONFIDENTIAL* 962/2   4 4 (a) (i) Carboxyl, amino, ester and amide [4](ii) Amine and carboxylic acid.This amino acid can exist as zwitterionsAttraction between this ion with polar water molecules is responsible forit solubility[1][1](b) (i) Heat with dilute sulphuric acid / H 2 SO 4  / H + [1](ii) [1]+ _H 3 N  –  CH  –  COO|CH 2  |[1][1]TOTAL MARKS 10OH|H - C - H|H+ _H 3 N  –  CH    –  COO   |   CH 2   |   COOH
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