Edexcel Jun 2017 Paper 2 Q9 (with explained solutions) |

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Edexcel Jun 2017 Paper 2 Q9

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9 The molecule with the strongest London forces is A CF B CHF 2Cl C CH D CH 2Cl2 3I 10 Separate samples of lithium carbonate and magnesium carbonate were heated using the apparatus shown. (Total for Question 9 = 1 mark) A E R A S I H T N I E T I R W T O N O D solid delivery tube limewater A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D heat (a) The limewater went cloudy for A both carbonat es. B only lithium carbonate. C only magnesium carbonate. D neither carbonate. (b) In a test with limewater, the cloudiness is due to the formation of a precipitate of A calcium carbonat e. B calcium hydrogencarbonate. C calcium hydroxide. D calcium oxide. (1) (1) (Total for Question 10 = 2 marks) *P53493A0520* Turn over<br />

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Mark Mark Mark Mark Answer 8(a). The only correct answer is B A is not correct because this is all of the molecules present and not just those affected by the catalyst C is not correct because this is only the additional molecules that can react in the presence of a catalyst D is not correct because this is only the additional molecules that can react in the absence of a catalyst Answer 8(b). The only correct answer is D A is not correct because peak height decreases and lowering the temperature moves the peak to the left B is not correct because this is the effect of lowering the temperature C is not correct because the height of the peak must decrease to keep the total number of molecules the same Answer 9. The only correct answer is D A is not correct because CF4 only has 42 electrons compared to 62 for CH3I B is not correct because CHF2Cl only has 42 electrons compared to 62 for CH3I C is not correct because CH2Cl2 only has 42 electrons compared to 62 for CH3I Answer 10(a). The only correct answer is A B is not correct because magnesium carbonate also decomposes on heating C is not correct because lithium carbonate also decomposes on heating D is not correct because both carbonates decompose on heating Question Number 8(a) Question Number 8(b) Question Number 9 Question Number 10(a)<br />

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