This question concerns the reaction of hydrogen

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Unformatted text preview: y conditions. B the presence of UV light. C the presence of a suitable catalyst. D heating under reflux. (b) The reaction is best described as (1) A nucleophilic substitution. B electrophilic substitution. C nucleophilic addition. D electrophilic addition. (c) The major product of the reaction will be (1) A 1-bromopropane B 2-bromopropane C 1,2-dibromopropane D 2-bromopropene (Total for Question 13 = 3 marks) 14 Many organic compounds have toxic vapours. For this reason A a naked flame should never be used when carrying out experiments with organic compounds. B gloves should usually be worn when carrying out experiments with organic compounds. C a fume cupboard should be used wherever possible when carrying out experiments with organic compounds. D most experiments with organic compounds are banned in schools and colleges. (Total for Question 14 = 1 mark) *P38433A0724* 7 Turn over 15 Ethanol (molar mass 46 g mol–1) is manufactured by the hydration of ethene (molar mass 28 g mol–1): C2H4 + H2O C2H5OH In a typical process 28 tonnes of ethene produces 43.7 tonnes of ethanol. The percentage yield of ethanol in this process is A 64% B 95% C 100% D 156% (Total for Question 15 = 1 mark) TOTAL FOR SECTION A = 20 MARKS 8 *P38433A0824* BLANK PAGE *P38433A0924* 9 Turn over SECTION B Answer ALL the questions. Write your answers in the spaces provided. 16 The first ionization energy of each of the elements from neon to argon is shown on the graph below. The first ionization energy of potassium has been omitted. 2500 2000 1500 Ionization energy / kJ mol–1 1000 500 0 Ne Na Mg Al Si P Elements S Cl Ar K (a) Define the term first ionization energy. (3) . . . . . . . . . . ............................... .............................................................. . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................... .............................................................. . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................... .............................................................. . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................... .............................................................. . . . . . . . . . . . . . . . . . . . . . . . .. ....
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