Edexcel Jun 2017 (IAL) Paper 1 Q19

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SECTION B Answer ALL the questions. Write your answers in the spaces provided. 19 A sample of an element, X, was extracted from a meteorite. The table gives the percentage abundance of the isotopes of X obtained from the mass spectrum of the sample. m/e 54 56 57 % abundance 6.10 92.0 1.90 (a) (i) Calculate the relative atomic mass of the element in this sample. Give your answer to three significant figures. 10 (ii) Identify X and hence give the numbers of subatomic particles present in the species at m/e = 56 in the mass spectrum.Number of particles present in the species at m/e = 56 protons electrons neutrons *P48382A01024* (2) (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 D O N O T W R I T E I N T H I S A R E A<br /> A E R A S I H T N I E T I R W T O N O D (iii) A peak at m/e = 28 was also detected in the mass spectrum of X. Identify the species which produced this peak. (1)(iv) Explain why the three isotopes of X have the same chemical properties. (2)(b) (i) Outline how a solid sample of element X is converted into ions 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(ii) Following the formation of ions, there are three steps in the production of a spectrum in the mass spectrometer. Name the three steps in order and state how the first two are carried out. (3)A E R A S I H T N I E T I R W T O N O D(Total for Question 19 = 12 marks) *P48382A01124* 11 Turn over<br />

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