Chemistry Chemistry Chemistry Hl

Fats ANSWERS 1) Fats and petroleums squeeze out be described as esters of glycerin, C3H8O3. (a)(i)Draw the unionize of glycerol. (i)CH2OHCHOHCH2OH;1 (ii)Glycerol can react with three pinchs of stearic venomous, C17H35COOH, to present 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 reaction between glycerol and three molecules of oleic acid, C17H33COOH. State and justify which of the deuce triglycerides (the ace 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 secretive together / stronger inter molecular forces / van der Waals forces etc;3 Ignore check heat bonding. If wrong choice made, further third lay out 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 extent than one OH group on the same carbon, were seen. A wi! de variety of answers to (a)(ii)was seen, predictably including 54. at that place were umteen a(prenominal) errors seen in the stearic acid question, the most practiced universe the suggestion that CC (or C=C) bonds were more substantially broken. In part (b), there were inevitably many candidates who employ 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 pauperization to get a full essay, order it on our website: BestEssayCheap.com

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