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Unformatted text preview: ............................................................. G3. (a) Draw the shapes of the water and carbon dioxide molecules and describe what occurs at the molecular level during the absorption of infrared radiation by these molecules. [5] ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... ......................................................................... (This question continues on the following page) 221-154 Turn over – 18 – M01/420/H(3) (Question G3 continued) (b) The infrared spectrum of one of the following compounds is shown below: CH 3CH 2OCH 2CH 3 CH3CH 2 CO2 H CH3CH 2 CH 2 OH CH3CH 2 CO2 CH 2 CH3 100 90 Percent transmittance 80 70 60 50 40 30 20 10 0 4600 3800 3000 2200 1800 1400 Wavenumber / cm −1 1000 800 600 400 (This question continues on the following page) 221-154 – 19 – M01/420/H(3) (Question G3 (b) continued) (i) Using Table 18 in the Data Booklet, determine which compound the spectrum represents and give its full structural formula. Explain how you ma...
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