CIE Jun 2015 v1 Paper 2 Q1

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Answer all the questions in the spaces provided. (a) Chemists recognise that atoms are made of three types of particle. Complete the following table with their names and properties. name of particle relative mass relative charge 1/1836 (b) The relative atomic mass of an element can be determined using data from its mass spectrum. The mass spectrum of element X is shown, with the percentage abundance of each isotope labelled. [3] 60 50 40 30 20 10 percentage abundance 49.61 23.77 9.37 7.63 8.73 73 0.89 74 75 76 77 78 m / e 79 80 81 82 83 (i) De ne the terms relative atomic mass and isotope. relative atomic massisotope[3]UCLES 2015 9701/21/M/J/15<br /> (ii) Use the data in the mass spectrum to calculate the relative atomic mass, Ar, of X. Give your answer to two decimal places and suggest the identity of X. Ar of Xidentity of X[2] (c) The element tellurium, Te, reacts with chlorine to form a single solid product, with a relative formula mass of 270. The product contains 52.6% chlorine by mass. (i) Calculate the molecular formula of this chloride. molecular formula[3] (ii) This chloride melts at 224 C and reacts vigorously with water. State the type of bonding and structure present in this chloride and explain your reasoning.[2] (iii) Suggest an equation for the reaction of this chloride with water.[1]UCLES 2015 9701/21/M/J/15 [Turn over<br /> (d) Sodium and silicon also react directly with chlorine to produce the chlorides shown. chloride NaCl SiCl 4 melting point / C difference between the electronegativities of the elements 801 69 2.2 1.3 (i) Describe what you would see during the reaction between sodium and chlorine.[2] (ii) Explain the differences between the melting points of these two chlorides in terms of their structure and bonding. You should refer to the difference between the electronegativities of the elements in your answer. NaCl structure and bondingSiCl 4 structure and bondingexplanation[4] [Total: 20]UCLES 2015 9701/21/M/J/15<br />

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