Ch115_T2A_F06_Key - Page 1 of 6 Y Name 8 7(Please Print)...

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Unformatted text preview: Page 1 of 6 Y Name 8 7(Please Print) Student Number Chem 115 — Section 1 Hour Examination 11 November 8, 2006 This test consists of six (6) pages, including this cover page. Be sure your copy is complete before beginning your work. If this test packet is defective, ask for another one- Show all numeric answers to the proper number of significant digits. A separate copy of the periodic table will be distributed with this test packet. Feel free to use it in conjunction with any test question. In addition you may need some of the following relationships and constants: 1 A = 1 x 10"” m = 0.1 nm (exact relationships) Planck's constant = 6.626 x 10‘34 J -s speed of light in vac:qu = 2.998 x 103 m's‘l DO NOT WRITE BELOW THIS LINE TOTAL Robert. L. Carter, .32.]: 2310 ocw.umb.edu Page 2 of 6 7 Name K a; 1. (10 points; 2 points each) Who did what? Match the person with the concept or discovery. People Arrhenius Batmer Bohr Bracken Einstein Hess Lenard Lymann Pfund Planck Rutherford Thomson Concepts and Discoveries a. B D in it” Predicted lowest energy electron in hydrogen has r = 0.529 A b. an E ‘4 Used the idea of quantized energy to explain black-body radiation c. E's-t vagina} g3 Explained photoelectric effect in terms of wave-particle duality d. Er r Men 1 we. Described acids and bases in terms of electrolyte theory e. H C93 Enthalpy does not depend upon path 2. (12 points; 6 points each) Write the net ionic equations for the reactions that occur when the following are mixed together. Indicate all states (e. g., s, I, g, aq). 3- Pbm03)2(09) + KM?) mom-E"? +3%03\ + +2.1‘931a Fiji} 9. “*- ) ~+ Min?) J Phi-kc»? 4— 2.1.3153 --"* 'PbILLr.) b. HC104(aq) + NaC2H302(aq) H'i'fiflgfi + (1)0:0163 4... 4- (Pat-1 5027-013) “'5’ HG.J HBOLQLE) *Cflt‘n )4- H+L7L33 —'r‘ Cbugozflchgfi “'3’ H CZH BD2 (.2: 3) Robert L. Carter, Ph.D (-3 2010 ocw.umb.edu Page 3 of 6 T Name E Q y — 3. (32 points; 4 points each) Circle the correct answer to each of the following. a. Which one of the following is soluble in water (i.e., all others are insoluble or only sparingly soluble)? Mg(0H)2 NiS HgZClz Ag2C03 Ba(Ol-l)3 b. Which one of the following is a weak electrolyte in water? HClO4 Ca(0H)2 CEHSOH HBr c. If the following solutions were each treated with excess HCl(aq), which one would produce a gas? NH4Cl(aq) CH30H(aq) NagCO3(aq) KClO4(aq) CaBr2(aq) d. Which One of the following has the highest concentration of carom in solution? 0.10 M NaCl 0.050 M A12(SO4)3 0.050 M CaClz 0.10 M HC2H302 e. In which one of the following reactions is iodine undergoing reduction? 2 “(619Vr (312019) * 12(5) + 2 KCllaq) KIO3(aq) + 6 Hg(l) + 6 HCl(aq) » KI(aq) + 3 Hg3C12(s) + 3 H200) f. Each of the following denotes an electronic transition from an initial to a final state in the hydrogen atom, ninm, e nfiml. Which transition results in the emission of visible radiation? 1—-oo 2-5 5—'4 3—‘2 241 \~__ g. Which of the following has the highest energy? uluaviolet infrared red light radio waves h. What is the energy in joules (J) of a photon whose wavelength is 623 nm? 1.06x10-2U 1.06x10‘35] 4.81x19+"‘J 3.19x10-9SJ Robert L. Carter, Ph.D G 2010 ocw.umb.edu Page 4 of6 v Name k g 3,5 4. (16 points; 8 points each part) Answer both parts. Show work in the spaces provided to justify your answers. a. How many grams of NaC1(s) (f.w. = 58.44 u) are needed to prepare exacth 250 mL of a 0.1252 M NaCI(aq) solution? M use). = (0,2.Soopfl(o.x1§2.M\ = 0,03130 M “=- . gg'urq' \ -_—_ L»qu who; C0 OM50 a b. How many milliliters (mL) of 0.1252 M NaCl(aq) solution are need to completely precipitate all the silver ion in 25.00 mL of 0.1200 M AgNO3(aq) solution by the reactiou NaCl(aq) + AgNO3(aq) ~v AgCl(s)-1— NaN 03019) hand/H. RQD03": (2.3.00wL—WOALOOM“) —_— 5,0099,»th -:. \owu 3.000wwmat s. 25 flow/ML. m; as i «s my"..me s . ML l0 a A wen-{QAEQLM W”),me— Robert L. Carter, Ph.D 2010 ocw.umb.edu Page 5 of6 T Nme_%;— 5. (16 points) Calculate the enthalpy of the following reaction [90(5) + HZOU) a 2 KOH(S) AB“ = ? Given the following thermochemical equations: 2. 2 KOH(s) + (302(3) ~ ECO—3(5) + H200) AH“ = +193.05 id to 4 K(s) + 02(3) + 2 C02(g) — 2 K2C03(s) m = —2300.36 kJ a 4 Km + 02(g) a 2 190(5) AH" = —726.34 kJ £26959) + lib/0(2) —-r luck-Ks) +Eeifij AH": -— Ha c9ng ~22. Vb flame—V w‘ce,‘ wK. as) AR°:-—v\l60.1%l’—‘S 2’ 2:62:23 0? £02, AH0=+3e3.\1\c3 fl/Z‘C K2}; 6‘.» fl—LKvL-s‘} + % ) KZOGQ-i‘ HpOIQXJZKot—kcs‘) AH°=~fi20.0éak'S Robert L. Carter, Ph.D (-3 2010 ocw.umb.edu Page 6 of 6 t NameAF—Wf— 6. (14 points + 5 point bonus) The standard heat of combustion of diisopmpyl ether, (C3H7)20(l) (m.w. 102. I 7 u), is defined by the following thermochemical equation: (Cusbofl) + 9 02(3) * 6 C02(g) + 7 H200) 93: = ‘? a. (10 points) A student combusted a 1.95 O-g sample of diisopropyl ether in the bomb of a calorimeter having a heat capacity of 7.430 ka°C. The temperature of the water in the calorimeter rose from 21.15 °C to 31.45 °C. Based on this experiment, what is the value of the heat of the reactiori per gram of diiSOpI‘Opyl ether? AT: C5L24g* “24.65%: : 1.0.300; 8.6,]! 1:. C 134-55ij {Bengal—50 ac“) ___._ 16°52qu "49.3 is: £41“: 7% :“J’LZQQ’V—F/% 22‘. “3‘1.ZS icy/3 G b. (4 points) What isthe value of the heat of combustion per mole of diisopropyl ether? 1;. —-4P{)i(30 b;:§lib”¢gé? c. (5 point bonus) Given the thermochemical equation for the cumbustion of diisopropyl ether and the following standard enthalpies of formation, calculate the standard enthalpy of formation, AH}, for CGHDOHU), assuming that your calculated value of qc is essentially the standard enthalpy of combustion, AH)... (Your answer to part b must be essentially correct to receive bonus credit.) H 0(1) —393.5 kamol —285.8 klfmol 5H7: 1' 6’ “attach-l ‘" “f “areth —- M3 dualism“: {EH1 (regs—94$ - (,LsH‘fiCcoQ + 113 Him”) __ AWE = Cat-saucer) + {Mb-22m my -. (-— 1+0 \0 H.) — *23c1.0k'§— 2 000.5 k3 + 40l0k3 = —-%S'\.t°\<,3 =— James Robert L. Carter, Ph.D 6 2010 ocw.umb.edu ...
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This note was uploaded on 03/01/2012 for the course CHEM 116 taught by Professor Robertcarter during the Spring '07 term at University of Massachusetts Boston.

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Ch115_T2A_F06_Key - Page 1 of 6 Y Name 8 7(Please Print)...

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