Edexcel Jun 2012 Paper 3 Q2 (with explained solutions) |

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Edexcel Jun 2012 Paper 3 Q2

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2 A series of tests was carried out on a white powder, E, which is known to be a Group 2 nitrate. (a) Complete the inference column for each test in the table below by giving a name or formula. (4) Test Observation Inference Carry out a flame test on E. Pale green flame Add dilute sulfuric acid to an aqueous solution of E. White precipitate Heat a sample of E very strongly. Test any gases given off with a glowing splint. A brown gas is evolved The glowing splint relights The metal ion isThe precipitate isThe brown gas isThe gas which relights the glowing splint is(b) The formula of E is(c) Write an equation to show the reaction which occurs when a sample of E is heated very strongly. State symbols are not required. (1) (2) (Total for Question 2 = 7 marks) *P39310A0416*<br />

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Reject Just Ba Ba+ Mark Correct Answer (1) (The metal ion is) barium/Ba2+ (1) (The precipitate is) barium sulfate/ BaSO4 ALLOW barium sulphate (The gas is) nitrogen dioxide/NO2 (1) ALLOW dinitrogen tetroxide/N2O4 (The gas which relights the glowing (1) splint is) Oxygen/O2 Note: If both name and formulae are given both must be correct Mark the four parts independently Reject Mark Reject Mark Correct Answer Ba(NO3)2 ALLOW Ba(NO3)2.xH2O where x is a number between 1 and 10 e.g. Ba(NO3)2.2H2O Correct Answer 2Ba(NO3)2 (cid:198) 2BaO + 4NO2 + O2 (2) Fully correct equation Formulae of all three products correct (1) ALLOW multiples ALLOW 4BaNO3 (cid:198) 2Ba2O + 4NO2 + O2 (1) Question Number 2(a) Question Number 2(b) Question Number 2(c)<br />

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