Ch115_T2C_F06_Key - Page I of 6 I: Name K6); (Please Print)...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Page I of 6 I: Name K6); (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 run (exact relationships) Planck's constant = 6.626 x 10"34 1-3 speed oflight in vacuuo = 2.998 x 103 ms1 DO NOT WRITE BELOW THIS LINE TOTAL Robert L. Carter, Ph.D 6 2-310 ocw.umb.edu Page 2 of 6 I: Name Kay: 1. (10 points; 2 points each) Who did what? Match the person with the concept or discovery. People Arrhenius Balmer Bohr Brackett Einstein Hess Lenard Lymann Pfund Planck Rutherford Thomson Concepts and Discoveries a. H 69$ Enthalpy does not depend upon path 13. Pl :1.“ d: Used the idea of quantized energy to explain black-body radiation 0. t m. 5*‘61 n Explained photoelectric effect in terms of particles of light d. pfi r r ‘0 en 2 Laos Described acids and bases in terms of electrolyte theory e. Bo 1" Predicted lowest energy electron in hydrogen has r = 0.529 A 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 (c.g., s, I, g, aq). 31- MEW03)2(09) + N30H(HQ) 4" With?) +3M626) + 20¢“? -—--"P‘ MSCOHlICS‘) 4' lye-{0L3} 4' lull/"El M815?) 4. Loafing)” MoéfColecs) b. HBr(aq) + KC102(aq) Hfizgwiix’lufi) 4- 576-5) e mo; 3 —-+ 1—: LblObth-E) + + W15) Hfizefifi 4- 0102,17?) —-——r HOLOLLZES Robert L. Carter, ?h.D G 2010 ocw.umb.edu Page 3 of 6 a bhune i<:;€3:f 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)? b. Which one of the following is a weak electrolyte in water? Mg(0H)2 Hg2012 Ag2C03 PbSO4 HC104 Ca(OH)2 H2804 CEHSOH @ c. If the following solutions were each treated with excess NaOH(aq), which one would produce a gas? KC104(aq) (NH4)SO4(aq) CH30H(aq) d. Which one of the following has the highest concentration of anions in solution? 0.10 M NaCl 0.050 M A12(304)3 0.050 M K2804 0.10 M HC2H302 e. In which one of the following reactions is iodine undergoing oxidation? Na2C03(aq) CaBr2(aq) 2 KI(at?!) + Pb(N03)z(mJ) * Pb12(aq) + 2 KN03(GQ) K103(aq) + 6 HgU) + 6 HCl(aq) ~ KI(aq) + 3 Hg2C12(s)+ 3 H200) 2 Kl(aq) + Clam) ~ 120) + 2 KCl(aq) f. Each of the following denotes an electronic transition from an initial to a final state in the hydrogen atom, 10 ~ nml. Which transition results in the emission of infrared radiation? mmm 54 1 w w 2 - 5 3 —- 2 2 —- l g. Which of the following has the highest energy? x-rays infrared red light radio waves h. What is the energy in joules (J) of a photon whose wavelength is 436 nm? 1.52 x10'” J 1.52 x 10—35] 4.56 x 1049] 4.56 x1043] 6.88 x10”“J Robert L. Carter, Ph.D G 2010 ocw.umb.edu Page 4 of6 a Name _\’Z 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 Nal(s) (f.w. = 149.9 u) are needed to prepare exactly 250 mL of a 0.1252 M Nal(aq) solution? M mm. = (oasoouw. 1282M}: 0.03130 wt? 2:031:11 "5 (0.019130 4.55128, b. How many milliliters (mL) of 0.1252 M NaI(aq) solution are need to completely precipitate all the silver ion in 25.00 mL of0. 1000 M AgNO3(ag) solution by the reaction NaI(aq) + AgNO3(aq) 4 Agl{s) + NaNO3(aq) MAM/PE. ABMOQ": L23,09mL\L0'\OOOM‘3 -:. ngOOWWf-J'g vbfl’L’ ‘4) 1L. cad>lvm :; '2” €§C>€>MVN\AAW#4E a. [51 '51 \v- W ang’zmmfi/mv 2h”! ; Robert L. Carter, Ph.D 6 2010 ocw.umb.edu Page 5 of 6 a Name E a? 5. (16 points) Calculate the enthalpy of the following reaction 1220(3) + H200) ~ 2 LiOH(s) AH" '2 Given the following thermochemical equations: a, 2 LiOH(s) + C02(g) » Li2C03(s) + H200) AH“ = +13s.49 k] ’0 4 Li(s) + 02(g) + 2 C02(g) a 2 LiZCO3(S) AH“ = —2432.08 H a 4 Li(s) + 02(g) ~ 2 {220(3) AH“ = 4197.46 kl ... a, Wgeh + ulocay .n—a— 1L1|Ouccs$ 4- Q?) AH”: # I38.‘+0\ u; ’ d) .— 2» we wmwmwww w Wm: . . 0.; 5 3.7-3 k3 5H0: _”+Sg. 80165 Lnlo {AA + “20(13flf L L'IOHC‘JX Robert L. Carter, Ph.D (-3 2010 ocw.umb.edu Page6 of6 a Name K517! 6. (14 points + 5 point bonus) The standard heat of combustion of diethyl ether, (C2H5)30(1) (m.w. 74.12 u), is defined by the following thermochemical equation: (02119200) + 6 02(3) * 4 (302(3) + 5 H200) 92 = '3 a. (10 points) A student combusted a 2.250-g sample of diethyl ether in the bomb of a calorimeter having a heat capacity of 7.638 UPC. The temperature of the water in the calorimeter rose from 22.15 °C to 33.0] °C. Based on this experiment, what is the value of the heat of the reaction per gram of diethyl ether? T: (330x 42,“; 3°C. : lageoa figcjdl'tL C q'fig2’g kLEYDC:)(:HDrgC:OCS> : glljat*3qhkax igan —.-. —‘8W3-+U : .. scarab, arr/t?I : norms; H73 @150 b. (4 points) What is the value of the heat of combustion per mole of diethyl ether? 63‘; (lac-~23) ._._ _ 24mm rag/We Afl 3! W = —nask3/wm€ e. (5 point bonus) Given the thermochemical equation for the combustion of dietheyl ether and the following standard enthalpies of formation, calculate the standard enthalpy of formation, AH; for (C2H5)20(l), 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.) —393.5 klfmol —285.8 le'mol 5H1: 4mfimaz) 4— SAHyH‘LO) - AH: (Lei/H929) Asiugagp) :- 4aa1ccobs w easier-rip": -* AWE, .— N; ~- gai‘Dstas.sa5‘3 amass; my! 5} awe-3&1“) :— —IS?°:.0 k3 ~142a,o kl‘ +2'+3%l<$ 1' “FPO. )5 Robert, L. Carter, Ph.D 2010 ocw.umb.edu ...
View Full Document

Page1 / 6

Ch115_T2C_F06_Key - Page I of 6 I: Name K6); (Please Print)...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online