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PracticeFinal2002-key - Final Exam Chem 1C 2002 l(4 pts...

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Unformatted text preview: Final Exam Chem 1C 2002 l. (4 pts) Which of the following complexes will absorb visible radiation of the shorter wavelength. Circle the answer. M [Co(H20)613* [Cowman [Co(NH3)6]3+ big ‘ i A :‘ lac/h e,— shorfi (st/mil) 2. a) (4 pts) Draw the high spin d—orbital diagram for octahedral [Co(H20)6]2+ and tetrahedral [CoC12(H20)2] ,_—- complexes. ~—-— -— + C 0 1 f 3 01 7 096 3 01 7 i J. j_ _4_ 1. E 11 12 .1 1y [Co(H20)6]2+ [CoC12(H20)2]2‘ b) (2 pts) Which will absorb light of longer wavelength, [Co(H20)6]2+ 0— 6M A 1-; [AC/PS 6,0143% 3. (6 pts) Draw the geometrical isomers of the complex ion [Fe(H20)2Cl4]Z' . H O . cl 1 CL I my Cl~—-_Fl ,xcl “- ,/ e . cl/rtewma “‘71 \C‘ N HCO 4. (6 pts) Which of the following complexes has the greatest number of counter ions? No work = No partial credit. a) hexaaquanickelfll) chloride [N i‘ 2 '+ 6 H20 J E e l 9 @sodium hexacyanoferrate(III) 3 N 01 + K: 6 C N ‘— Fe 3 i] / . —— ‘ 2 f c) potassium tetrachloroplatenate(II) '2 [Q l' [ Ll C 1 Pl J d) tetraaminechloronitrocobalt(III) chloride [H N H e) triamminebromoplatinumfll) chloride [3 N H; B r— {3% Z 1’ C | Final Exam Chem lC 2002 5. (6 pts) For each of the following transformations, state whether the reaction is an oxidation reaction, a reduction reaction or neither. Circle the answer. a) the conversion of propanol into propanal reduction neither b) the conversion of ethene into 1,2-chloroethane reduction neither 0) the conversion of ethyne into ethene oxidation neither 6. Write the balanced equation for the condensation reaction of each of the following. a) (4 pts) In the presence of a strong dehydration agent such as H2804, two alcohol molecules react to produce an ether. Write the balanced equation for the condensation of methanol with 2—methy1-2-propanol to produce an ether. OH CH} l I , (3H30H + ($010“; “"3 CH3‘0‘CI'CH3 + H20 CH5 0H3 b) (4 pts) Write the balanced equation for the condensation of alanine with acetic acid (CHJCOOH) to produce an amide. 0 H Cid/'3 /0H ICI) iii CH; 0 4 \ ,. 4 CH_C 1, M”C—C ~——> CHBC'NCHC 5 \ / l §O \ OH H H OH 7. (8 pts) There are two possible aldehydes that have the formula, C4HgO. Draw the two aldehydes and name them. Draw ONLY two structures. Cross out any structure that is not part of your answer. 0 (I C “.3 Structure: . (3H3 CHZ CHa C H \ cmch //a \H “m _J&EQEL__ _~££&yiflwwd 2 Final Exam Chem 1C 2002 8. (20 pts) a) Draw the structure of each of the following compounds. b) Draw the optical isomers ONLY IF the compound has an optical isomer. 0) Identify each chiral carbon by circling it. Cross out all structures that are not part of your answer. Points will be taken off for duplicate structures. a) l-chloropropane cHscfich acl Mirror plane VH9 optical isoowu b) 2-chloropentane c) 3-bromopentane 8 r l H maoledJ d) 1,3—dichlorobutane cl l c lCHl Cl'll'g‘-CH3 H (sawua 1', / (L CHcCHZ C l C l \"CH \H 3 Final Exam Chem IC 2002 9. Consider the structure for the following compound. .' NH 2 a) (4 pts) Write the molecular formula for the compound? C 7 H [5 N 5 b) (6 pts) Give the approximate values for the bond angles marked a, b and c. Bond angle a: I 0 ? Bond angle b: I 0 2 Bond angle c: I Q 0 c) (6 pts) What is the hybridization on the three nitrogen atoms indicated? 3 First Nitrogen: S E 3 Second Nitrogen: S E 1 Third Nitrogen: S E 10. (6 pts) Draw the structure for Val-Cys -Phe in that order. fl 5 \ / O H I O I CI H '.' I €HZ II I" €HZ g 0 Hz Mv ’-C’N —C «C ~M «ac -—c ‘ ’ l \ 0 H H H H 11. (8 pts) Indicate whether or not each of the following quantities affect the vapor pressure of a liquid? Circle the answer. a) intermolecular forces in the liquid yes no b) volume of liquid in the liquid-vapor equilibrium yes ‘ c) the size of the container holding the liquid-vapor equilibrium yes E (1) temperature of the liquid yes no Final Exam Chem 1C 2002 12. (24 pts) Circle the formula (only E) that best fits each of the following descriptions: a) highest boiling point CH4 co2 b) highest boiling point rig—E1 CH3CH2CH3 H20 CH3OCH3 c) highest boiling point CH3OH CH3SH - d) liquid at room temperature CH3CH3 LE N20 SiOz e) smallest atomic radius P Na Si f) highest boiling point Ne Ar He E g) has one n-bond C0 C02 N2 h) polar molecule CF4 co2 so3 BF3 i) strongest bond NO E C12 02 j) most ionic in character CaClz MgClz k) 12 (s) dissolves in H20 (1) CHSOH (1) 1) 12(5) dissolves in - NH3 (aq) vinegar 13. (6 pts) Indicate the type of crystalline solid formed for each 0 the following substances. 0 o v all Q ' a) CHSNHZ MM b) SiOz £26] W0] lg c) K Mfidw l C 14. (10 pts) Pentane (Csle) and hexane (CGHM) form an ideal solution. The vapor pressure of pure pentane is 510 torr at 25°C and the vapor pressure of pure hexane is 150 torr at 25°C. The mole fraction of hexane in a pentane-hexane solution is 0.50. Calculate the mole fraction of pentane in the vapor in equilibrium with this solution at 25°C. _ o 7 __ l ft ’ Xe PR ?C5H : 015 {5m\t0rr): (255 {Off Final Exam Chem IC 2002 15. a) (3 pts) Draw the Lewis structure for allene, CHZCCHz? :czc _ H/c \H b) (2 pts) What is the hybridization on the central carbon in allene? 5 P c) (3 pts) Are all the atoms in CHZCCHz in the same plane? Circle the answer. Yes ? No I! 16. a) (4 ptS) Determine the bond order for each ofthe following species using the MO mode1_ H; ( 6| S ) B» 0. : 1/1 H22‘ (€15)Z(€I:)Z 3,0. :(Z-Z)L ; o E @fis) 130.:Q,@Q:‘ H; (615) (6.5)' 310.: (2'0/& ; l/Z b) (2 pts) Which of the following species is NOT stable according to the MO model. Circle the answer. 11; sz‘ H2 H; 17. (6 pts) Phosphorous acid, H3P03 is a diprotic acid. Draw the structure of H3130; and circle the acidic hydrogens. 00 0 '® 1 OF 02P'0{E> C9 -— (: 0 ’ 1 1” 1 g, 18. (6 pts) Polyethylene is a synthetic polymer that has many uses. 1.40 g of a polyethylene sample is dissolved in enough benzene to make 100 mL of solution, and the osmotic pressure was found to be 1.86 torr at 25°C. What is the molar mass of the polyethylene? Circle the answer. NO WORK = NO CREDIT a) 1.06 x 10“ g/mol b) 1.19 x104 g/mol c) 1.06 x 10“ g/mol d) 5720 g/mol e) 1.40 x 105 g/mol ...
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