Exam 2 Test Form B

Exam 2 Test Form B - LAB SECTION SIDS FORM B The University...

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Unformatted text preview: LAB SECTION SIDS FORM B The University of Arizona Chem. 151 Spring 2008 Wayne E. Wesoiowski, PhD / Andrew J. Grail, PhD EXAM No. 2 THE FOLLOWING MUST BE COMPLETELY FILLED—IN OR YOUR EXAM WILL NOT BE GRADED. NAME: PRINT (clearly) my signature below cextifies that I have used a calculator for numerical calculations only» NAME-- SIGN THERE IS A 3-POINT PENALTY FOR ILLEGIBLE NANIES or Scantron corrections DIRECTIONS aDO NOT OPEN THE EXAM UNTIL INSTRUCTED TO DO SO. OYOU MUST USE PENCILS ON THE SCANTRONS ION YOUR SCANTRON H WRITE AND BUBBLE IN YOUR STUDENT ID STARTING ON THE LEFT — FOR THE ‘8’ AT THE BEGINNING, BUBBLE IN A ZERO oON YOUR SCANTRON — WRITE AND BUBBLE IN YOUR LAST AND FIRST NAMES SEPARATED BY A SPACE oFILL [N THE CORRESPONDING FORM LETTER OKEEP ALL PAPERS IN FRONT OF YOU, ON YOUR DESK AT ALL TIMES. OCROSS OUT ANY SCRAP WORK THAT YOU DO NOT WANT INCLUDED IN YOUR ANSWERS. oFOR MULTIPLE CHOICE QUESTIONS, CIRCLE THE LETTER 0R NUMBER OF THE CHOICE THAT BEST ANSWERS THE QUESTION. UNLESS NOTED THERE IS ONLY ONE CORRECT CHOICE. IF MORE THAN ONE CHOICE IS SELECTED THE QUESTION WILL BE MARKED WRONG. SELECT THE CLOSEST NUMERICAL ANSWERS IF YOUR CALCULATION IS SLIGHTLY DIFFERENT. IFOR QUESTIONS MARKED “FREE ANSWER” or PARTIAL CREDIT -- INCLUDE ALL YOUR CALCULATIONS. IF YOU GIVE ONLY THE CALCULATED ANSWER, IT WILL BE GRADED AS ZERO CREDIT. oPOINT ALLOCATION FOR EACH QUESTION IS INDICATED, OGIVE ANSWERS FOR CALCULATIONS TO THE CORRECT NUMBER OF SIGNIFICANT FIGURES IWHEN YOU HAVE FINISHED PUT THE SCANTRON SHEET INSIDE THE BOOKLET BEFORE HANDING IT IN. OHOLD YOUR PICTURE ID UP TO YOUR FACE WHEN TURNING IN AN EXAM oWI-IEN FINISHED, LAST NAMES BEGINNING A-K, TURN IN YOUR TESTS IN FRONT - LAST NAMES Luz, TURN IN YOUR TESTS IN THE BACK DO NOT WRITE IN THIS BOX 17 18 19 20 21 3 pts each- 1) Which of the following species has the smallest atomic radius? A) F F + o) F" D) all the same 2) How many valence electrons are there in a neutral P atom? A)2 B)3 (3)4 3) The newly discovered imaginary element “Wildcatiurn” consists of three isotopes, 60.0% mass 20.0 amu and 20.0% mass 40.0 axon and the remainder mass 60.0 amu. What is the average atomic mass of Wildcatiurn‘? a. 40.0 amu b. 80.0 amu c. 10.7 amu @0 amu 4) What do these have in common? zomNe 1991: 1‘ 2412Mg2+ A) They have the same size B) They have the same number of neutrons C . ey have the same number of protons __ _ .' u ey have the same number of electrons E They have nothing in common 5) Of the following, radiation h e shortest/viavelength and radiation has the greatest energy. Red light W” green light a) red, green 1! 'olet, red. b) green, red a clot, violet 0) green, violet 6) How do microwaves interact with molecules? A) cause molecules to vibrate oves electrons from level to level uses molecules to rotate ) breaks bonds releasing energy 7) Which substance has a high melting point, a high boiling point, conducts electricity when melted , but does not conduct as a solid? A) 303 B) CBr4 @g:; D) Cu 8). What are the names of each type of orbital in order (including axes; for example, (122 not just d. ) A) (1223 dx -y25 S B) Pz: Px+Py 5 25 C) stdxya nyz 22dxy)s 9) The electron configuration of aNi2+ ion is: a) [AI]3d2 b) [Aryans7 c) [Ar]4sz3d8 AI]3d8 e) [Ax14s23a6 10) Palladium (element 46——«just below Ni) by experiment is diamagnetic. Which of the following electronic configurations is consistent with this experimental result? A) [Kr] 5324d8 [Kt]4d10 C) [Ar] 5324(18 D) [K115514619 11) Based on this unit cell if 0 = atom A and 0 = atom B what is the empirical formula? A) AzABz C) A134 D) AB 12) Below is part of an ionic crystal lattice where o = cation and O = anion. The circled area re presents 0 A) a molecule of o o .. O {0 O 6 empirical formula O O C) a pair of ions sharing electrons D) a covalent bond 13) The ionization energies for the first three electrons of an element are respectively 10, 49, and 50 electron-volts (a unit of energy used by Physicists). Using the periodic table, which element might fit this experiment? g 40 *3, g C) I E 20 D) Ca E 10 E) S 2 0 +1 +2 ‘3 [on Charge 14) Arrange the following compounds in order of decreasing melting point LiF, NaF, KF, RbF A) LiF, NaF, RbF, iF,NaF., KF,RbF C) RbF,,KF,NaF, LiF D) KF,RbF,NaF, LiF 15) Suppose a new imaginary element was found below S but above Se. What charge is likely for its ions and roughly what is its mass? A)-l ,56 B) -2, 33 @156 D) +1, 111 16). Consider the following emission spectra of a hypothetical atom: A chemist builds a simple atomic model to explain this spectrum. She assumes electrons emit energy when moving between three different quantized states, as shown in the diagram: Which of the three possible transitions, A, B, or C, generates E n = 3 Ii ‘ ira‘wavelength of 390 nm? B A) A B) B C) C n=2 Fill in the following, DO NOT mark on the scantron sheet. The TA’s will put in a partial or full credit grade for you. 17. (12 pts 2 each) Fill in the table below with given information. LEBX-IO‘QS" max/022 €§2 '5’ Iggxwgm Lek/ow? 9,?‘3fl/OH3’ of i me.) Q ME 3-3" re U 19) Consider the following molecule: a) Spts List which bonds in the molecule are polar, and which are non polar?. Polar C302; WQEQQW/ non-polar l‘IL'C Explain Of? {5" g??? Q gfwl‘9gfi‘é‘V‘1l 9‘ b)2 ptsWhich bond is most polar? Q “' H Explain. O'Flhgflbc c) 4pts Indicate, using 6 for partial charges and arrows for the dipole moments, the polarity of each bond. go a“ go— d“ co @- H—C c—o c=o 0-3 u. H E 2; 20) Collections of “A” atoms with configuration [Ng] ns1 react with “B” atoms with configuration [Ng]nsznp5 to form a solid. [Ng] = noble gas core. a) 4pts What general type of compound will they form (circle) covalent, metallic) Justify 6ft} 1-4 _. If? A “PI Fan and 61er QA «emcee/f rm "1’ {bag 1)) 4pts What would be the empirical formula of this compound in terms of A and B? AB c) 4pts Draw a macroscopic representation of the compound including at least 4 particles of each. 21) Bonus 10 points lpt ans 1 pt “explain” You are given two rigid metal tanks of exactly the same volume. Both are at room temperature. The tank marked “Kr” contains 10 g of Krypton gas (M = {Mg/moi). The tank marked “Xe” contains 10 g of Xenon gas (M = 131glnlol). For each of the following questions first CIRCLE the tank name then explain your choice. A) In which balloon do the particles have a lower average kinetic energy? Circle : Tank “Kr” or Tank “Xe” Explain. " SQMQ } m gawé Ql/é? L/I/E B) In which tank are the ' oving at an average slower speed? Circle : Tank “Kr” Tank “Xe same” Explain. ‘23“ gqmg GEN/9 Kg} Mwfimkfa Mg Mp/f fi4f¢rV9 pea/“#5435; mus’rf“ 415a? {rm/Q. S’W/i , D) Which : a .. u s the higher pressure? Explain. Circle r Tank “Xe” or same Explaméfixfff—DT Q} l ; l/Cnm €é$fi<% \/ '?/Q§§UKG> ma$+'éQ $91“? X7§$J at? I} 4.0 me! 1? § E) If the average speed of the Kr molecules is 700,11118 What is the average speed of the Xe molecules? Show work for any credit. .7» W Va; 3:“? CU QW‘E/ 60/ @574”? ‘nfi/ycn/ beg/e #25? 0” V3594“ } @064 Hm, 2’”; E794 Periodic Table . f“... .2. i ,, 1. T 3 £ 1 5B 53 73 i 33 1 13 a 23 §3A EBA EVA 28A 1 . - mm. m... .. $2 I 1119- i g 34.003i i is is E7 {8‘ 9 £10 gz §Li aBe :3 1c in 30 {F §Ne E g $5.941 E9012 10.31 312.01 314.01 115.00 519.00 320.10 3 E12 E13 E14 115 ‘15 317 §18 l 13 00a 1M9 ‘Al ‘Si _P s ECI )Ar 122.99 24.31 1 25.98 28.09 530.97 32.07 35.45 $39.95 1 g2.....,___.mw....E..__mw.ww:._.,_..mm31.18....”“2. mm.“ E... m... . .2. m 1 ,_ __. -f. “WE g 119 §20 221 322 i23 i24 E25 225 127 §28 29 $30 31 :32 i33 34 Q35 135 3 3K ECa §5c in !v gCr gMn gFe ion :Ni 1C0 in: ma 168 As 358 §Br .Kr i 1 339.10 340.08 244.95 .4788 150.94 E52.00 154.94 i55.85 158.93 158.59 53.55 §55.39 E59.72 572.51 .7402 578.96 179.90 333.80 €37 i{38 $39 {40 E41 E42 343 544 §45 §45 23.7 148 349 g{50 Q51 g52 §53 E54 § gs [Rb 151' )Y §Zr §Nb gMo 1Tc 1R1: iRh Pd iAg god 3In 35:! :50 gm )1 1x8 185.47 )8752 188.91 391.22 392.91 195.94 §(98) E101.1 1102.9 105.4 3107.9 1112.4 1114.8 1118.7 §121.8 3127.5 1125.9 {131.3 $55 $55 §57* E72 E73 374 §75 $8 79 {80 81 §82 £83 ‘84 $585 185 g 16 gas 33a §La in §Ta 1w iRe gas in in .110 in; ET: 030 eBi 020 SM 11:11 i g 5132.9 1137.3 1138.9 [178.5 1180.9 1103.9 1186.2 1190.2 3192.2 [195.1 i197.0 E2005 204.4 $207.2 $2090 (209) {(210) «222) g {87 {38 589“ {104 3105 1105 i107 5108 E109 §110 111 i112 ‘ 17 aFr file 5115 ng 100 159 3311 iHs EM: 1 3 R223) 3225.0 i227.0 §(261) 1(262) 1(253) §(262) K255) 5(255) $269} (272) 3(277) j Useful information: E = hv ; c = 7w ; h = 6.626 x 10'34js ; c = 2.998 x 103 m/s NA = 5.0221 x 1023 particles/mo], R = 1.097 x 107 m“1 3190‘11'04393931911‘9 E28610 ...
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Exam 2 Test Form B - LAB SECTION SIDS FORM B The University...

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