Suggest two reasons why the UK government might encourage the building of more

Suggest two reasons why the uk government might

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Suggest two reasons why the UK government might encourage the building of more hydrogen filling stations. [2 marks] ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ Question 6 continues on the next page Turn over
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14 Do not write outside the box G/Jun14/CH3HP (14) 6 (c) The equation for the reaction of hydrogen with oxygen is: 2 H 2 + O 2 2 H 2 O During the reaction, energy is used to break the bonds of the reactants. Energy is released when new bonds are made to form the product. Bond energies for the reaction are given in Table 1 . Table 1 Bond Bond energy in kJ H H 436 O O 498 H O 464 The structures of the reactants and product are shown in Figure 8 . Figure 8 H H O O H H O hydrogen oxygen water 6 (c) (i) Calculate the energy change for the reaction: 2 H 2 + O 2 2 H 2 O [3 marks] ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ Energy change = .............................. kJ
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15 Do not write outside the box G/Jun14/CH3HP Turn over (15) 6 (c) (ii) The reaction of hydrogen with oxygen is exothermic. Complete the energy level diagram for this reaction on Figure 9 . Clearly label the activation energy. [3 marks] Figure 9 Energy 2 H 2 + O 2 ____ 9 Turn over for the next question
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16 Do not write outside the box G/Jun14/CH3HP (16) 7 The colours of fireworks are produced by chemicals. Figure 10 7 (a) Information about four chemicals is given in Table 2 . Complete Table 2 . [2 marks] Table 2 Chemical Colour produced in firework barium chloride green ......................... carbonate crimson sodium nitrate ......................... calcium sulfate red
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17 Do not write outside the box G/Jun14/CH3HP (17) 7 (b) Describe a test to show that barium chloride solution contains chloride ions. Give the result of the test. [2 marks] ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ 7 (c) A student did two tests on a solution of compound X . Test 1 Sodium hydroxide solution was added. A blue precipitate was formed. Test 2 Dilute hydrochloric acid was added. Barium chloride solution was then added. A white precipitate was formed. The student concluded that compound X is iron(II) sulfate. Is the student’s conclusion correct? Explain your answer. [3 marks] ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ____ 7 END OF QUESTIONS
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18 G/Jun14/CH3HP Do not write outside the box (18) There are no questions printed on this page DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED
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19 G/Jun14/CH3HP Do not write outside the box (19) There are no questions printed on this page DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED
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20 G/Jun14/CH3HP Do not write outside the box (20) There are no questions printed on this page DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED Acknowledgement of copyright-holders and publishers Permission to reproduce all copyright material has been applied for.
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  • Spring '16
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  • Biology, RNA, Pastpaperquestions AQA Science, ........., Sodium hydroxide

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