AQA AS Jun 2016 Paper 1 Q4 (with explained solutions) |

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AQA AS Jun 2016 Paper 1 Q4

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4 Table 2 shows some data about the elements bromine and magnesium. Table 2Element Bromine Magnesium Melting point / K Boiling point / K 266 923 332 1383 In terms of structure and bonding explain why the boiling point of bromine is different from that of magnesium. Suggest why magnesium is a liquid over a much greater temperature range compared to bromine. [5 marks] 0 4 . 1 *09* Turn overM/Jun16/7404/1<br />

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MARK SCHEMEAS CHEMISTRY7404/1JUNE 2016 Question 04.1 Marking Guidance Mark Comments Structures M1 Bromine is (simple) molecular / simple molecules M2 Magnesium is metallic / consists of (positive) ions in a (sea) of delocalised electrons Strength M3 Br2 has weak (van der Waals) forces between the molecules / weak IMFs M4 so more energy is needed to overcome the Stronger (metallic) bonds or converse. The comparison could be direct or implied. Liquid range M5 Mg has a much greater liquid range because forces of attraction in liquid / molten metal are strong(er) OR converse argument for Br2 1 1 1 1 1 Chemical Error penalties If Br2 (covalent) bonds broken lose M3 and M4 If eg Mg molecules or Mg ionic bonds lose M2 and M4 Must refer to liquid range to score M5 10 of 17<br />

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