OCR A Jun 2016 Paper 1 Q2

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This question is about halogens. (a) Solid chlorine and solid bromine have a similar structure. Name this structure.[1] (b) The intermolecular attractions in halogens are van der Waals forces. (i) Explain how van der Waals forces arise between halogen molecules.[3] (ii) The boiling points of chlorine and bromine are shown in the table. Halogen chlorine bromine Boiling point / C 34 59 Explain why bromine has a higher boiling point than chlorine.[2]OCR 2016<br />
 (c) A student carries out test-tube experiments to prove the trend in reactivity of halogens. The student is provided with the following solutions:Chlorine gas and chlorine water are not available. bromine water aqueous iodine aqueous barium chloride aqueous magnesium bromide aqueous calcium iodide. The student carries out the minimum number of test-tube experiments using these solutions in the presence of cyclohexane (an organic solvent). State the solutions that need to be added together in order to prove the trend in reactivity of the halogens, using the minimum number of test-tube experiments. Describe the colour seen in the organic solvent at the end of each test-tube experiment.Write an ionic equation for one reaction that takes place.[5]OCR 2016 [Total: 11] Turn over<br />

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