Exam 4 p5 - page 5 21(I Xylitol is a sugar alcohol Xylitol...

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Unformatted text preview: page 5 21. (I) Xylitol is a sugar alcohol. Xylitol metabolism does not require insulin and it does not promote tooth decay; thus, products sweetened with xylitol can be labeled “sugar flee”. Xylitol extracted fiom birch tree pulp is used in candies, chewing gum, and natural-ingredient toothpastes. The melting point of xylitol is 95 - 97°C , while the melting point of the straight—chain hydrocarbon n—dodecane, CH3-(CH2)10 -CH3 , is -9°C . Account for the difference in melting point in terms of intermolecular forces. Hadrojen hmncltms ¥or¢eg are 9+FOMj¢p Hm.“ London GUS Per 9 ion fierce$ 0 H CHZZCH-C-NHZ 22. (D In 2002, Acrylamide was detected in minute amounts (ppm range or less) in starchy foods baked or fried at high temperatures, especially above 175°C (3470F ). It is formed by a reaction between the amino acid asparagine and certain sugars, like glucose. Whether the amounts present in such foods as potato chips or cereals is high enough to pose a health risk has been the subject of some studies. Polyacrylamide (i.e. polymerized acrylamide), is used as a water-soluble thickening agent and as a gel in electrophoresis. Draw the structure of a portion of this polymer. ae-CHf— (Iii-i —— CH—L—ClH --" CH;- fiH—fi; Addi'hct; Poizwcl‘ .— h-nc ef- Hi“: {:‘i‘mfls - C :C :C x a c o; D — ‘Nfit . 0 ‘NH-a, “ x,_ 0‘ ‘Alu1-\ OH 23. (L) The polyester formed firom lactic acid, CH3 -CH -C02H , is used for tissue implants and surgical sutures that will dissolve in the body. Dr ‘w the structure of a portion of this polymer. f ._ .0 trio 2 , {it ,_ c H- o \__‘> 2 — en — oi: 3— i” ~015; Commie-H Paléwrv— tho mimics ._ i 3‘ _ D St CH3 (“3 CH3 " (2-2m + H0~R' (3 r a u ., , ”Hi—«o R 4» (+10 24. (Z5 Alkenes and Aromatic compounds (like benzene) react differently with Chlorine. (6O What are the [email protected])of their reaction? H H u ‘ H Fe ca a ct . CH22CH-CH2-CH3 + C12 —) CHI-(.mwicu} @ + Ci2 —> 3 Hi“ + H ‘2 t l u Add‘dw‘on tp 0“,, (Q Q H H H Suki-Nuke“ read-ion In the case of the benzene reaction, the attacking reagent has characteristics of " Cli " . (I‘) (9 What would be the product if the reagent had characteristics of " ECHé " instead (produced from CH3-C1 and AlCl3 )7 H @ C 3 (Fr (J'sig subsykyon) ([3 (Ci Why does benzene require a catalyst (FeCl; ) for reaction but the alkene does not? Annmarie; hxolromrboms are unusuqug sin“; because. a Q a. Closed shell) electrom‘: am (IRE-Arnhem regulsuj from "i n + ’L desirous (in 7 O, ‘,'2- . ) in a coy‘f‘mvouslj overiotppt‘mfl each}. Sjsi'cM at, p orbitals , ...
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