Lab Quizzes - Calculations Quiz 10 pts SHOW ALL...

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Unformatted text preview: Calculations Quiz 10 pts SHOW ALL CALCULATIONS FOR CREDIT! 0 Calculate molecular weights for the reagents (5M1 and 5M2) and product (PROD). 0 Determine the limiting reagent. 0 Calculate theoretical yield. 9 Calculate percent yield for the reaction. 4% +5 ‘3 ti o o O ' ' l O H+ W OH OH (:6: Wait; 5M1 a a; 5M2 \ PROD Density ‘ 0.785 :71 “58> ‘ mm J 5% It is expected that you will know the units for density and the atomic masses for C, H and O. The reaction to be analyzed: 5 g of glutaric acid is combined with 100 mL of ethanol in an acid—catalyzed Fischer esterification. Upon completion of the reaction the mixture is neutralized and extracted to isolate 5.80 g of the diester. ELSA-L- SN 5 (mixofiwfisomxay wow): 339‘“th cchlgom Humm‘yrodmm): quamc. Mfifllfl Pm may mi) +9000? “@Wfiéfi}: 1133?: al‘ésiwl K E .6 a; . ~ ws‘ a 3*”? W..-” . 5W...“ u '5» r»,- “WM Thor Walé y» Y )Ma§ l magwa agg‘gig h r f 4 W R I J VézQfigxgfiwol ‘3 "1 Ma , Va rum/s?" 3; n2: gal CHEM 3112 Column Quiz Why is it important to avoid air bubbles in the column during chromatography? a. The air in the bubbles might react with the compounds being separated b. Bubbles are toxic and harmful to your health @ Bubbles cause the samples to travel unevenly down the column and the components \ might not separate d. Bubbles block the flow from the bottom of the column A mixture of the following two components is eluted from a column. Which compound will elutefirst? ° (tic) What are the two most common stationary phases used in column and thin layer chromatography? I r {at V x“ 2 The mobile phase or eluent is either a pure @flolvenB/solution/solubility) or a mixture of different solvents. Circle the correct word. \ Given the choice of a 2-cm diameter column and a 10—cm diameter column each of the same length, which column will give better separation? Explain what happens to the loaded sample to make the separation better. (QC M (jiamxmttr m i e 25% r: {my I I Jig/V ‘ ‘ The 5mm max t; @Vfiéfifi. Showed be. Wm 2s diameter"; 7"? (00%" /‘w " 5 l f-” A (fir. l'. (‘1? If d‘fli’ ‘ d‘gaj.¢tz1§§ff€fi,f" 33%: is; 0 (4L Wm} «4W1 logs/flaw? CC” ’3- '- «55 MFA/‘7 Given the choice of a 10—cm column and a 20—cm column each having the same diameter, which column will give better separation? Explain what happens to the loaded sample to make the separation better. 5206.. M ll) VIA... 7". J\\\fi IR Quiz 10 pts Each IR spectrum below corresponds to one of the following compounds. Identify the compound and label as many peaks as possible to prove the assignment. 0 OH a& LED TEHNSfiETTHHCEl 9.! an O HUUU 20w 15m] 1300 Ellfl HavF‘NIIHnFQI ...I LED SD IFHNDIILI lNI'lLEI'G‘ d lllfltl REVEHUHE ER] -il Aldol/Esterification Quiz “>9, 10 points (LI in the boxes below, write the total number of each type of functional group in the four molecules below. ( imam ’ g x T, 2 fw- QJ Q g . if? Q. 7 . c1 \ w A it 0’ 0 o kw- y /, {Emlé Ketone Alcohol l T) Ester Q I Ether [ ] Identify the starting reagents needed to make the following compound by a mixed aldol condensation. O ?? KOH, MeOH W A. ,benzaldehyde (CaH5CH=O) and 3—pentanone benzaldehyde (CeH50H=O) and 2-pentanone C. acetophenone (methyl phenyl ketone) and 2—butanone D. acetophenone (methyl phenyl ketone) and butanal Choose the best reagentos) for carrying out the following conversion. 0 o 0” (foe 0 What is the product of the foliowing inttantolecuiar aide! condensation reaction? MH KOH, CHgOH ,2? H heat ' ' A. 1. (szlVlgBr, ether 2. Hgo" . ’l. (Ph)ZCHi\iigBr, ether 2. H36+ @ ’i. 2 PhMgBr, ether 2. Hag“ I Ali of the above work Which of the compounds shown below would be 1330' consistent with the 1H NMR spectrum shown below? ° ‘ l l ’ | "‘ I ' I ' l ' "l ' 11 10 HSP— 04—432 9 8 7 OH Answer the foliowing questions based on the chemical equation shown here: O O OH OCH ©/U\ + CHSOH 11—0; 3 + H20 A B c J A, g "9’?" The nucleophile in this reaction is ‘ En Compound C functions as in this reaction. a. a base scavenger b. a solvent @ a catalyst d . a neutralizer Fischer esterification is an example of: a. nucleophilic acyl addition nucleophilic acyl substitution c. nucleophilic acyl elimination d. nucleophilic acyl rearrangement What are the products of the following reaction? 0 JV 0 NaOH, H20 ?? heat COZ‘Na+ OH 3- — (3/ + A/ CHEM 3112 Thin Layer Chromatography Quiz 1) If several compounds are present in a sample which is developed on a TLC plate, a column of spots is seen on the developed plate, with: a. more polar compounds toward the bottom of the plate and less polar toward the top more polar compounds toward the top of the plate and less polar toward the bottom 0. lower boiling compounds toward the bottom of the plate and higher boiling toward the top (1. lower boiling compounds toward the top of the plate and higher boiling toward the bottom 2) TLC is generally used as a qualitative analytical technique for: a. determining the number of components in a mixture b. checking the purity of a compound 0. following the course of a reaction all of the above 3) In general, a compound will move further on a TLC plate with a: {fat} ( polar solvent b non—polar solvent 4) A beaker will be used as a "developing jar" in this experiment. When the TLC plate is set in this beaker, the solvent in the beaker must be: below the pencil line used to guide the spotting of samples deep enough to cover the entire TLC plate above the pencil line used to guide the spotting of samples deep enough to come about halfway up the TLC plate 999‘ 5) What happens to the sample spots if the solvent level is not correct in the “developing jar”? < TWA} W m “‘3 ’1" by, (L0,? @2221"? t at“ Mr :2? , , O” 'M 6) If two substances are run on the same TLC plate have the same Rf value, they are: likely, but not necessarily, different compounds definitely different compounds likely, but not necessarily, the same compound definitely the same compound 9263.6 9’ 7) How are TLC spots typically visualized? Circle all that apply. UV light b. Microscope @ Iodine crystals d. IR glasses Visually observe colored spots " fists _ 8) The three Comfioufld§ b61006 are‘t’un oti'va silica gel TLC plate developed in hexanes—ethyl acetate (70:30). 5““ R .T—i'x imt‘: Hat? 3 -.' if“? ‘ [$2 ,* if? tit—«stings Ewe" ‘*~§:§"%,:f?‘ (gr—":1; sit ataettst tits; a Eafitfiffiflifi Etflif}. a. the carboxylic acid will run the fastest and the alcohol the slowest y carboxylic acid will run the fastest and the aromatic the slowest th e alcohol will run the fastest and the aromatic the slowest d. the aromatic will run the fastest and the carboxylic acid the slowest Consider the following TLC plate when answering questions (9) and (10). The plate was developed in ether. 9) The Rf of Compound A is: a. 3.5 b. 1.0 c. 0.80 0.35 e. O 10) A fresh TLC plate is spotted with compounds A, B, and C, but this time the solvent is hexanes. How will this affect the Rf of compound B? 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Lab Quizzes - Calculations Quiz 10 pts SHOW ALL...

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