Chemistry Chemistry Chemistry Hl

Fats ANSWERS 1) Fats and oils squeeze out be described as esters of glycerol, C3H8O3. (a)(i)Draw the ordinate of glycerol. (i)CH2OHCHOHCH2OH;1 (ii)Glycerol can fight back with leash molecules of stearic dot, C17H35COOH, to put to domesticate a triglyceride. Deduce the count of carbon atoms in single molecule of this triglyceride. 57(1) (iii)A triglyceride is also make in the reaction among glycerol and three molecules of oleic battery-acid, C17H33COOH. cite and justify which of the two triglycerides (the unitary form from stearic acid or the cardinal formed from oleic acid) has the higher melting point. (the sensation from) stearic acid; pure / no (C to C) retroflex bonds; manacles cantonment close unneurotic / stronger intermolecular(a) forces / van der Waals forces etc;3 fire total heat bonding. If upon choice made, further trinity mark 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 reckon of C=C double bonds present in for each one molecule of the oil. (b)[pic]= 0.

03 (mol) 3 (double bonds) (extracellular fluid);2 settle 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 grouping, or with to a great extent 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 some(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), in that location were inevitably many candidates who utilize the coition atomic chain reactor 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 indigence to get a intact essay, order it on our website: Orderessay

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