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VanKoppen_Exam2_PracticeExam3_Key

VanKoppen_Exam2_PracticeExam3_Key - Exam 2 White Version...

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Unformatted text preview: Exam 2 White Version Chem.lC 2005 l. (4 pts) Give the oxidation state of the central metal atom in each of the following coordination compounds and the coordination number. Oxidation State Coordination Number [Cr(NH3)4Br2]NO3 + 3 Q K[CoBr2C12(en)] + 3 6 2. (4 pts) Give the systematic name for the following compound. [Cr(H20)4(Br)2]CI Jrelcm a 91 140! all Io r0 m0 oh r0 mm m (m ) cworiol a 3. (5 pts) [Co(H20)2C12] does not have c’iialdgang isomers. Draw the structure for [Co(HZO)2Clz]. .7) +ci’ra inflow“. HlO \ /C‘0 \-_ 0 \C 4. (5 pts) Draw the structure for cis- -diamminedichloroplatinum(II). C: :7 Square P\amar {'[3N\ /CI 5. (6 pts) Draw the d-orbital diagram, including the electrons, for weak field K3[CoF6]. C0 3 + 04 4 tab: 0! [ ET 4 j— 13>k0c ahipriah 6. (4 pts) Two compounds, A and B, are synthesized. Compound A is blue and compound B is yellow. Which compound has the larger crystal field splitting, A? Circle the answer. Compound A I Compound B S waL Sam” A: VIC/A absm’bs Oramg (2, IO lei / l 2‘ ~650 “w- 4, 14610 MW‘ lat/lgéfr Swall“ Exam 2 White Version Chem.1C 2005 7. (4 pts) If a solution shows positive deviations from Raoult’s law, would you expect it to have a higher or lower boiling point than if it were ideal? Circle the answer. a) lower boiling point b) higher boiling point c) can not be determined from information given 'poSit‘n/e OLLVtahOI/I :7 Wall/wt vapcm PMSSMAL :7 law/A, bailifg 130w 8. When pure methanol is mixed with water, the solution gets warmer to the touch. L. W raleapeol:7 9K0 ’rl/termi (1 a) (3 pts) Is AH,“ positive, negative or zero? Circle the answer. ‘~—- AI_Isoln > 0 ‘ AP150111 < 0 S AP150111 : 0 b) (3 pts) Is the solution is ideal, or does it exhibit a negative deviation from ideal or a positive deviation from ideal? Circle the answer. Ideal solution Negative deviation Positive deviation c) (6 pts) Draw a graph showing the vapor pressure as a function of the mole fraction of water, XHZO. a c H3034 T’ ) P320 PHZO Vapor Pressure —> 9 XH20 9. (10 pts) A solution of benzene and toluene has a total vapor pressure of 45.1 torr at of 25°C. At 25°C, the vapor pressure of pure benzene is 95.0 torr and the vapor pressure of pure toluene is 28.4 torr. Assuming the solution behaves ideally, determine the mole fraction of benzene in the solution. Pf : (45" {arr x59: + (va0er : ws-i wrr Xb(‘/5'0l0") + U v xb3(23,q1arr): (45,] lorr 66.6 xb : 16.7 Xb : 0.25 Exam 2 White Version Chem.1C 2005 10. (8 pts) Calculate the molarity of a saturated solution of K2804 if the solubility is 13 g of K2804 per 100 g of water at 25°C. The density of the solution is 1.1 g/mL at 25°C. Mfilfllrlllfl : W135 SOlMJ’C 17a! .3 Ea/wol ‘33(‘l71:’£3lj> " /i0 3 M (113 j ¥%>(EEQML> 11. (6 pts) In class we mixed 150 mL of methanol with 150 mL of water and red food color, which produced a uniform red solution. Then we added 100 g of K2C03 (s). The resulting solution consisted of two layers. The bottom layer was clear and the top layer was red. Identify the major components in each layer. Major components 1n top layer: C H3 O H ) +300 dl 00 lo F Major components in bottom layer: K 7‘14) ) C 032'(a 01 ) j H Z 0 12. (4 pts) When we touch something hot a signal is sent to our brain to allow us to quickly detect pain. Cells signal with salt. Ion transport through nerve cell membranes produces a signal that is conveyed from nerve cell to nerve cell. Ion transport involves both K+ and Na+. Indicate if the following statement is true or false? Circle the answer. , Ion channels selectively admit Na+ into cells rather than K+ because Na+ is smaller than K“. 13. (6 pts) Draw the structure for each of the following compounds. [I a) l-methyl-cyclobutene CH 3 b) trans-2,3-dichloro-2-butene or! Cl\ / ‘3 /C : C\ Hjc Cl 3 Exam 2 White Version Chem.1C 2005 14, (8 pts) Draw the structure for each of the following compounds including cis and trans isomers if it has isomers. Cross out any structures that are not part of your answer. 2,3-dimethyl- l-pentene cH- . _ . H\ )/ 3 “a ClSIi’uV‘S Sm“ C 3 C ”/—_ _ /(~I’ \CHCHZ CH3 \S-Ow'erb | Cr“; C’Hs gr CH :chCHZCH} _. 2 .Hz 2,5-dimethyl—3-heptene CH3 CH3 (5‘43 | l '. l CHCH CH HCH CH Gig C: ._. )/ a .3 H ,\ ./C a 3 /c- c\ /C..: C\ H H CHJC‘H "l ' l C‘I‘S‘ Cir-5 +raM5 15. (8 pts) Draw four isomers of CSHIOOZ that are carboxylic acids. If you draw more than four isomers cross out any isomers that are not part of your answer. ‘3 ‘12 ~C-—0H 0 CH3 0 u l U 0H3CZHZCHZCHZ COH CHSCHCHLCOH ll . - 0H CH C i—c CHscHaCH C 54 ‘014 CF13 16. (6 pts) In an acidic solution, an alcohol reacts with a carboxylic acid to produce an ester and water. Draw the structure of the ester formed in the following reaction. 0 u g. cyclohexanol + CH3COOH -—> O 0 C C, H3 Q 0 H ...
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