OCR A AS Specimen Paper 1 Q20

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12 SECTION B Answer all the questions. 20 Bromine and mercury are the only two naturally occurring elements that are liquids at room temperature and pressure. Some physical properties of these two elements are given below. very low good Bromine Mercury 58.8 356.7 of the liquid Appearance at room temperature Melting point / oC Boiling point / oC Electrical conductivity dark orange liquid 7.2 shiny silver liquid 38.8 (a) Complete the full electron configuration of a bromine atom. 1s2 (b) Bromine and mercury react with many elements and compounds. Predict the formula of the compound formed when bromine reacts with aluminium. SPECIMEN melting point.(c) Explain how the structure and bonding in bromine account for its relatively low [1] [1] [3] H032/01OCR 2014<br /> 13 (d) Mercury and bromine react together to form mercury(II) bromide, HgBr2. Describe and explain how electrical conductivity occurs in mercury(II) bromide and mercury, in both solid and molten states. [5] (e) Element X melts at temperatures reached on very hot summer days. A sample of element X was analysed by mass spectrometry. The mass spectrum is shown below.72.17% SPECIMEN Give your answer to two decimal places. (i) Calculate the relative atomic mass of element X. relative abundance 27.83% 85 87 (%) m/z (ii) Suggest the identity of element X. relative atomic mass =[2]OCR 2014 H032/01[1] Turn over<br />

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