Bronze is made from copper and tin Bronze made better swords than pure copper

Bronze is made from copper and tin bronze made better

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Bronze is made from copper and tin. Bronze made better swords than pure copper. This is because bronze is harder than pure copper. Explain why bronze is harder than pure copper. Your answer should include details of: how the atoms are arranged in pure copper and bronze why pure copper is relatively soft why bronze is harder. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ (4 marks) 4
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13 GCSE Additional Science Chemistry 2 Specimen Paper Higher Tier V1.0 Turn over ! Do not write outside the box 7 This drinks bottle is made of thermosoftening plastic. Drinks bottles of this type can be recycled. Describe and explain how these used plastic bottles can be changed into new plastic objects. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ (4 marks) 4
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14 GCSE Additional Science Chemistry 2 Specimen Paper Higher Tier V1.0 Do not write outside the box 8 The picture shows sodium reacting with chlorine. The reaction forms sodium chloride, which contains sodium ions and chloride ions. 8 (a) The diagrams show how electrons are arranged in a sodium atom and a chlorine atom. Explain, in terms of electrons, what happens when sodium reacts with chlorine. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ (3 marks)
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15 GCSE Additional Science Chemistry 2 Specimen Paper Higher Tier V1.0 Turn over ! Do not write outside the box 8 (b) Explain, as fully as you can, why sodium chloride has a high melting point. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ (3 marks) Turn over for the next question 6
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16 GCSE Additional Science Chemistry 2 Specimen Paper Higher Tier V1.0 Do not write outside the box 9 Aspirin tablets have important medical uses. 9 (a) Aspirin is made when salicylic acid reacts with ethanoic anhydride. The equation for this reaction is: C 7 H 6 O 3 + C 4 H 6 O 3 C 9 H 8 O 4 + CH 3 COOH salicylic acid aspirin Calculate the maximum mass of aspirin that could be made from 100 g of salicylic acid. Show clearly how you work out your answer. The relative formula mass ( M r ) of salicylic acid (C 7 H 6 O 3 ) is 138. The relative formula mass ( M r ) of aspirin (C 9 H 8 O 4 ) is 180. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ Maximum mass of aspirin = ................................... g (2 marks)
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17 GCSE Additional Science Chemistry 2 Specimen Paper Higher Tier V1.0 Do not write outside the box 9 (b) (i) In an experiment a chemist calculated that the maximum yield of aspirin is 400 g. The chemist did the experiment but only made 250 g of aspirin. Calculate the percentage yield of aspirin for this experiment. Show clearly how you work out your answer. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ Percentage yield of aspirin = ............................ % (2 marks) 9 (b) (ii) Suggest one possible reason why the chemist did not have a percentage yield of 100 %. ............................................................................................................................................ ............................................................................................................................................ (1 mark) 9 (c) The use of a catalyst might reduce costs in the industrial production of aspirin. Suggest how.
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