Chemistry · 2009 · May · Paper 2 · SL · TZ1 · Question paper

2209-6111 13 pages M09/4/CHEMI/SP2/ENG/TZ1/XX+ Monday 18 May 2009 (afternoon) CHEMISTRY STandaRd lE vEl Pa PER 2 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 one question 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. 1 hour 15 minutes [Personal identifier removed] © International Baccalaureate Organization 2009 2 2 0 9 6 1 1 1 0113 2209-6111 – 2 – M09/4/CHEMI/SP2/ENG/TZ1/XX+ Section a Answer all the questions in the spaces provided. 1. Biodiesel makes use of plants’ ability to fix atmospheric carbon by photosynthesis. Many companies and individuals are now using biodiesel as a fuel in order to reduce their carbon footprint. Biodiesel can be synthesized from vegetable oil according to the following reaction. vegetable oil methanol glycerol biodiesel (a) Identify the organic functional group present in both vegetable oil and biodiesel. ....................................................................... [1] (b) For part of her extended essay investigation into the efficiency of the process, a student reacted a pure sample of a vegetable oil (where R = C17H33) with methanol. The raw data recorded for the reaction is below. Mass of oil = 1013.0 g Mass of methanol = 200.0 g Mass of sodium hydroxide = 3.5 g Mass of biodiesel produced = 811.0 g The relative molecular mass of the oil used by the student is 885.6. Calculate the amount (in moles) of the oil and the methanol used, and hence the amount (in moles) of excess methanol. ....................................................................... ....................................................................... .......................................................................