Edexcel Jan 2016 (IAL) Paper 1 Q18

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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 SECTION B Answer ALL the questions. Write your answers in the spaces provided. 18 (a) The relative atomic masses of elements can be determined using a mass spectrometer. (i) Define the term relative atomic mass. (3)(ii) Describe fully how positive ions are formed from gaseous atoms in a mass spectrometer. (2)A E R A S I H T N I E T I R W T O N O D *P46937A01124* 11 Turn over<br /> (iii) The following data were obtained from the mass spectrum of a sample of strontium. Mass / charge ratio % abundance 84.0 86.0 87.0 88.0 0.56 9.86 7.02 82.56 Calculate the relative atomic mass of strontium in this sample. Give your answer to three significant figures. D O N O T W R I T E I N T H I S A R E A (2) D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A (b) In which block of the Periodic Table is strontium found? (1)12 *P46937A01224*<br /> 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 (c) Draw the dot and cross diagram for strontium chloride. Show outer electrons only. (2) (d) A solution of strontium nitrate was prepared from strontium oxide and dilute nitric acid. Write the equation for this reaction, including state symbols. (2) (e) A compound of strontium contains 49.9% strontium, 13.7% carbon and 36.4% oxygen, by mass. Calculate the empirical formula for this compound. [Use relative atomic masses: Sr = 87.6, C = 12.0, O = 16.0] (3) A E R A S I H T N I E T I R W T O N O D *P46937A01324* 13 Turn over (Total for Question 18 = 15 marks)<br />

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