Edexcel Jan 2015 (IAL) Paper 3 Q1 (with explained solutions) |

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Edexcel Jan 2015 (IAL) Paper 3 Q1

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A cream coloured precipitate forms P contains theion (1) This confirms the inference in (a)(ii)(1) (1) Answer ALL the questions. Write your answers in the spaces provided. 1 Tests were carried out on compounds P and Q. Complete the tables below. (a) Compound P is a white inorganic solid which contains one cation and one anion. Test Observation Warm P with dilute aqueous sodium hydroxide A gas is given off which turns damp red litmus paper blue Inference (Name or formula) The gas is(1) (i) (ii) (iii) Add dilute nitric acid followed by aqueous silver nitrate to an aqueous solution of P Add dilute aqueous ammonia to the cream coloured precipitate (iv) The formula of P is*P45043A0216*<br />
(b) Q is an organic liquid which has only one functional group. Q dissolves in water forming a neutral solution. Test Observation Inference (i) Add bromine water to Q The bromine is not decolorised (ii) Add phosphorus(V) chloride to Q Misty fumes which react with ammonia to form a white smoke (iii) Add a small piece of sodium to QThe misty fumes areThe formula of the functional group in Q isThis confirms the inference made in (b)(ii) (1) (2) (1) *P45043A0316* Turn over<br />
(iv) The mass spectrum of Q is shown below. Relative intensity 100 80 60 40 20 10 15 20 25 30 m / e Identify Q by name or formula. Use information from the spectrum to justify your answer. 35 (2) Identity of QJustification(Total for Question 1 = 10 marks) *P45043A0416*<br />
BLANK PAGE *P45043A0516* Turn over<br />

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Acceptable Answers Reject Mark Ammonia / NH3 Ammonium / NH4 + 1 Acceptable Answers Reject Bromide / Br If name and formula are given both must be correct Bromine, Br2, Br Iodide, I, Chloride, Cl Acceptable Answers Reject Mark Mark Resolved for dissolved Precipitate becomes paler/ colour does not change Reject NH3Br Mark Precipitate does not dissolve / no change / remains ALLOW Precipitate insoluble/ Precipitate is partially soluble /sparingly soluble TE from (a)(ii) for chloride dissolves / iodide does not dissolve Acceptable Answers +Br- NH4Br / NH4 ALLOW correct formula even if charge missing on ion in (ii) TE on incorrect halide anion or halide ion with incorrect negative charge if formula otherwise correct No TE on a formula with a metal cation Ignore name even if incorrect Acceptable Answers Reject C=C bonds absent / alkene absent IGNORE it is an alkane/ contains C-C/ It is saturated/ is a saturated hydrocarbon Just double bonds absent Mark Question Number 1(a)(i) Question Number 1(a)(ii) Question Number 1(a)(iii) Question Number 1(a)(iv) Question Number 1(b)(i)<br />
Mark Mark Acceptable Answers Reject (Fumes are )HCl/ hydrogen chloride ALLOW Hydrochloric acid (1) (Formula) (-) OH /O-H ALLOW C-OH (1) OH- /alcohol/ (-) CH2OH COOH CnH2n+1OH Acceptable Answers Fizzing/ bubbles/ effervescence (of colourless gas)/ (sodium/ it) dissolves/ (sodium/ it) disappears/ white solid forms ALLOW White precipitate forms Gas evolved which pops with a lighted splint/ which ignites IGNORE Gets warmer/ Heat is evolved/ temperature rises/ vigorous reaction Vapour forms Sodium sinks/floats Reject References to coloured gas or coloured fumes white solid disappears / dissolves Just solution is colourless Question Number 1(b)(ii) Question Number 1(b)(iii)<br />
Acceptable Answers Reject Mark Total for Question 1 = 10 marks Correct name with wrong formula or vice versa. Highest peak has Mr of methanol Just Peak at m/e 15 is for CH3(+)Peak at 29 is for COH / CHO (Identity) Methanol / CH3OH OR Displayed/skeletal formula (1) (Justification) (only) alcohol with Mr = 32 / methanol has Mr = 32 / CH3OH = 32/ right hand peak has mass 32/ right hand peak has Mr of methanol NOTE Allow mark for any mention of 32 in conjunction with methanol. OR Other use of mass spec data: Peak at m/e 15 is for CH3(+) and 32- 15=OH(+) OR 32(mass of) OH = CH3(+) OR Peak at 31 is for CH3O(+)/ CH2OH(+) IGNORE Negative or missing charges on peaks (1) Second mark depends on identification of methanol. Question Number 1(b)(iv)<br />

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