Organic Chemis Essay

2674 Words Nov 21st, 2012 11 Pages
M09/4/CHEMI/HP2/ENG/TZ1/XX+

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CHEMISTRY HIGHER lEvEl PaPER 2 Monday 18 May 2009 (afternoon) 2 hours 15 minutes INSTRUCTIONS TO CANDIDATES Write your session number in the boxes above. Do not open this examination paper until instructed to do so. Section A: answer all of Section A in the spaces provided. Section B: answer two questions from Section B. Write your answers on answer sheets. Write your session number on each answer sheet, and attach them to this examination paper and your cover sheet using the tag provided. • At the end of the examination, indicate the numbers of the questions answered in the candidate box on your cover sheet and indicate the number of sheets used in the appropriate box on your cover sheet.
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– 4 – (Question 1 continued) (f) (e)

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Calculate the percentage yield of biodiesel obtained in this process. ....................................................................... ....................................................................... ....................................................................... .......................................................................

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When biodiesel is combusted it produces carbon dioxide. Explain why the use of biodiesel as a fuel does not significantly contribute to global warming. [1] ....................................................................... .......................................................................

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– 6 – 2. (a)

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The pKa value for propanoic acid is given in Table 15 of the Data Booklet. (i) State the equation for the reaction of propanoic acid with water. ..................................................................

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