Chemistry Chemistry Chemistry Hl

Fats ANSWERS 1) Fats and anoints squeeze out be described as esters of glycerine, C3H8O3. (a)(i)Draw the arrange of glycerol. (i)CH2OHCHOHCH2OH;1 (ii)Glycerol can react with three pinchs of stearic bitter, C17H35COOH, to lay out to work a triglyceride. Deduce the number of carbon atoms in iodine molecule of this triglyceride. 57(1) (iii)A triglyceride is also formed in the reply between glycerol and three molecules of oleic acid, C17H33COOH. State and justify which of the 2 triglycerides (the champion formed from stearic acid or the one formed from oleic acid) has the higher melting point. (the one from) stearic acid; saturated / no (C to C) double bonds; chains cantonment abutting together / stronger inter molecular forces / van der Waals forces etc;3 Ignore come in heat bonding. If w rong choice made, further third discover can be scored. (3) (b)An oil sample containing 0.0100 mol of oil was erect to react with 7.61 g of iodine, I2. Determine the number of C=C double bonds present in each molecule of the oil. (b)[pic]= 0.

03 (mol) 3 (double bonds) (extracellular fluid);2 Correct answer scores [2]. If 6 is given, with no working, cede [1]. (2) [May 2006 SL P3] ER: In (a), the structure of glycerol was well cognize by the better candidates, although quite a number of alcohols with only one OH group, or with to a greater exten t than one OH group on the same carbon, were! seen. A wide variety of answers to (a)(ii)was seen, predictably including 54. at that place were many a(prenominal) a(prenominal) errors seen in the stearic acid question, the most practiced be the suggestion that CC (or C=C) bonds were more intimately broken. In part (b), there were inevitably many candidates who utilise the coition atomic mass instead of the relative molecular mass of iodine in the calculation (for which ECF was allowed), and a surprising number failed to go on to verbalize the...If you privation to get a full essay, order it on our website: OrderCustomPaper.com

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