Exam #2 - 1 l l 'l i F10 Chemistry 151‘ FORM A EXAM 2 The...

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Unformatted text preview: 1 l l 'l i F10 Chemistry 151‘ FORM A EXAM 2 The University of Arizona Wayne E. Wesolowski, Ph.D., L. Tori Lockett, Ph.D., Laura Van Dorn, Ph.D., Pollyanna Wikrent M.S. THERE IS A 3—POINT PENALTY FOR ILLEGIBLE NAMES or improper seaming information. DIRECTIONS: On the scan sheet You must use pencil Write and bubble in your UA NetID (the part of your UA email address that is before the @ sign) starting on the left Bubble in the corresponding test form, A or B Sign where indicated that you have read and understand the directions. Your signature also certifies that you have used your calculator for numerical calculations only, and have not done anything to Violate the academic integrity code. *Nothing on the actual exam paper is graded. Only the scan sheet is graded. Your answers will only be graded if they are on the front and back of the scan sheet, as instructed below. Multiple Choice Questions (PART 1) Bubble the letter on your scan sheet that corresponds to the choice that best answers the question. Unless noted, there is only on correct choice. If more than one choice is selected the question will be marked as incorrect. For questions with numerical values as answers, if there is a slight difference between your answer and the available choices select the answer that is closest to yOur calculated value. Always use the correct number of significant figures and include units in your answer. Free Answer Questions (PART 2) The entire answer is to be written on the back of the scan sheet. Put your final answers in the boxes provided. , Always use the correct number of significant figures and include units in your answer. Nothing will be graded that is written on the actual exam page. On the back of the scan sheet, cross out or erase work that you do not want graded. Include all your calculations. In order to receive any possible partial credit, you must show your work. If you only give an answer, you will receive no credit. No work shown = no credit. NOTE All multiple choice questions are worth 4 points unless noted (50 points total) 1) A newly discOvered atom Xium has three naturally occurring isotopes: 150X (10.13%, 150.0083 amu), 151X(78.70%, 151.0092 amu), and 152x (11.17%, 152.0076 amu). Estimate the atomic weight of X. ' [0 103% 1 Lenora] mogmoa 21)] + [UH‘NIEZ 011 A) 150.13 amu 51.02 amu C) 152.03 amu D) 151.54 amu 2) What do these have in common? VAW 13714" 17714” ewe @5185 1238i ' ~353sz 3+ '1)" 111 if 6"] 31 .13, .3) 1;” I: They have the same size hey have the same number of neutrons C) They have the same number of protons D) They have the same number of electrons E) They have nothing in common 3) Indicate which diagram most closely represents a weather balloon undergoing the following changes: the external pressure is cut in half and the temperature (K) doubles. m 10. E )3 w 1 InitiaiGaS The final state is: A) 1 B) 2 D) need more data STOP WRITING!! READ THIS!!There is a 3 point penalty for incorrect information on the scanning sheet. What test form do you have? Is the corresponding bubble filled in on your scanning sheet? How about section #? UANetID? N; am) WW 3M/llit/{Jti’t/M mgr/«Mt 2 ‘ JWW mime; ifl‘VW’thI/x Via/Ml ' <3 4) In each of the following three pairs which atom or ion is larger? M bESi/Npgzthliéi W02_ Xe II_ C) 02_ Kr II_ D) Mg2+ Xe I :30 WWme ’ ’ ,, ’ ’ ’ ’ ’ ’ ‘ WrWS 62"“ WQW 5) Given e following electron configuration of a neutral atom how many core and valence ; electrons does this element have (core, valence).| 1s22322p6$s23p5 ‘ g A; 0m Wilt/1A UL... ' B) 4,13 C) 2, 15 D) 0,17 6) In each of the following three pairs which element has the higher first ionization energy? W;i¥;_m; (Be or “111) (9a or Ba) (Ar or Se) V6 T may/ti W / A) Be,Ba,Se ,Ca,Ar C) Be,Ca,Se D) N,Ba,Ar 7) How many photons are prL‘oduced in laser pulse of g(3.236 J at 529 nm? m i . h “.55 I, . - > )f .44 , g; W r%%§%wflbl a. 74? m Rim ~ A) 3.76 x 10'19 6.30 x1017 C) 6.022 x1023 D) 1.60 x10~18 w y/ . r? V . 2174‘; i "m 8) Atoms of Cu (element 29) are a solutely pm etic by experiment. Based on this data R9 mman /l (i. "” which of the following must be its electronic configuration? A) [Ar14s03d10 B) 1s22s23s23p64s°3d1° C) 1522823s23p64s23d104p6 @[Ar14s13d10 9) Which compound should have the highest melting point? “15% ()M/MlW-t’ ~ a 2 éjKflr B) 12 C) CH4 D) HCl L/J‘“ Br“ 3% )4 ‘ 4‘] K 247 K “I IOU”? K; 10) Which of the statements below is true about the following bonds: Cs-F Br-Br and N—Ofl ‘ W i a mm)th pow A) They are all ionic CW fl MM 0/“ A w/fl» J," They are all covalent C) They are in order of ionic, non-polar, polar They are in order of polar, non-polar, ionic E) They are in order of non-polar, ionic, polar 11) (5 points) Which of the following waves properly represent the photons that associate with the transitions shown below (A, B, C)? n=3 E 10814 high B low 1;; low L A C . Wild/Ha 11 II A) B) A B C A B C gm; A. fa / .2 fw’lmélté M 5 .s l ’..'l- 2 WW ‘ tii‘iiiégzizli! if ‘5 5 iiflmmzmi 2; V; C) A B C A ft? \ IA‘ “a l 3! 3i; ‘ §:;*.' Eitaflif‘: 5% 3 Eight a; i; it, E? a; :2 §%% 12) (5 pts) Which of the following statements is true about the atomic radii of the following atoms: Strontium (Sr), Tellurium (Te), Iodine (I). A) They are all about the same size. Kmafmwm\ B) Sr is the largest and I is the smallest due to an increase in protons and increase in @m/im/fi electrons in different shells. C) I is the largest and Sr is the smallest due to an increase in protons and increase in i electrons in different shells. @Sr is the largest and I is the smallest due to an increase in protons and increase in electrons in the same shell. E) I is the largest and Sr is the smallest due to an increase in protons and increase in electrons in the same shell. SWHW Will r”? hi law” Owlth AHTWHM WWW flmrlm/ if i” it are if ' ms m m, saw/n: val "’9 5 w Wlbsl Pl" ’6 6 Del "ll/u 3 1%» Sr “W Wei”. Part 2 (50 points total) Free Answer Instructions for PART 2: Put your ENTIRE answer, for each of the following three problems, on the back of the optical scanning sheet (in the boxes given for each problem). NOTHING will be graded that is on this sheet of paper. In order to receive partial credit, you MUST show computations. No work'means no credit. a m “WW”; 3 r K / "iYi/Vlfl Q 2-1 (a) (10 pts) Draw the PE Spectrum of a +1 ion (cation) that fits the following criteria: The charge of the ion is the most common one formed by its element. It is the largest atom in its {a row (period) on the periodic table. It has the third largest ionization energy in its column (group). ‘ mm It combines with other elements in a 1:1 ratio, forming an ionic compound. The compounds it in P a can form have high melting points, (19 not conduct elegricity as solids, but can conduct when dissolved in water. it M} (I I Make sure to label the PES spectrum clearly (axis etc.) and clearly indicate what ion you chose. NA (b) (10 pts total) The following PE Spectrum is of a neutral element. Redraw the spectrum on your answer form and answer the following questions relating to the spectru (L ts ea) a)What is the element? ‘ b) Label each peak with the n and 0 value p 0) Write the full electron configuration for this element / (1) Write the condensed (Noble gas) electron configuration for this element e) Assuming this atom has 15 neutrons, write the appropriate nuclide symbol (e. g AZX) \ ‘ Wfi (A no r a bird . .1 3 he: . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ -'" V) 5135’ j 2 @771» . e E I {/1247 @315 a \ I _, v ‘j v ‘V/ t. ><\ W 4W? ,4) (fat W 12 a 439» (m Number of Electrons 1 [/45 W5 flT-fi? mgmws M Mala/WW by" W} m y I, ‘ ‘ n . WrW/«WVWQ (mm MWva 114M 9“?“‘W3’35 WE Wm WM M: WW 3+2?»le flax/1+ jm. w my? (145; ivxm/M S‘o LC 1W3Um/W’mlm/iW-WM M P V {WM/WM WiH W lbw/WWW 4W ?’?mAA&HA mag/xiv «MM-m «pm/ma 0+ NE. mm; P: MEWS (OWW i m’ ’ * _ Mu I 360ch M— IME “*9. U56 V; \683 Oolhgimg WC rFWmd W WW WXM/Iwg MAW/WEE” £ch +1 WMW OMMQIM§>XflM ME mi M W «m Midile WW? (MAM mm WWW? W‘Jflwg \bwwm W WSSWU x "1" @> M125 WWW (W 41;; Mg W Wrmmmg H :7 Acch “YWSml/Q, {Wm/WWW mm? ] GOV/W Emmy fl AS W W 4» MW WT (L £- 41“ ' Mala figva Qaww % swam! mm «hm: MUXiv} fa UNA 'bI'HWW‘ M’llbwiwg ‘T‘M M’Fg 'fiVVIKi NHL/HM {X5 ‘\ ma OomAm/Igrg am hi WMT Wig Emma} Wag Wm M Maw/l»? Wfiwscg 2M 0/} WOMW‘W 9W4ng 4sz NE “W \(gs‘frmé 4% WHOM MA “1‘? H W Q2 4» 6&1 0M WW“ «fir Wk AWMM «Mae: 43> n+2“. +9 (WM/14%» MA 4‘» VT UJ $ +4, 5) %\WV\ W M: W} \\ OW Wm M (M *W T) L1 - ’ Salmféwg Wmeth *Z M gfiéflémmgifik m5ww wan ‘ A_A.~_;.-:A:A AA AA. ‘ Gnu“ ' - a A “Mix. Q ‘ :5 ’2' I -44 V, , ago 7; 22% NW”) NW\ MAW WWW ' ~\ WW6 5‘3“ w\ \{Wmé W W! WAH‘S m 3mm WMD’MMWHW WWW? 7L * ' m szAgxmjfid \Wm fix \X” (l7 } . . m :5: w ‘ ‘ M . L W 47> afigg—L: (u.u'%xrb“3flug\x> Osgfl7xw%s* MM; “2:? 105.77% WM? 2% x“ WW ‘ 7 WEN X\D‘"7‘m ;{V;‘6\ \ ~w\ WW WW “WK “Wm/1 W mmH/gMJU' WM" _ 7 \ ,u ,M “w, m“ “’\ Wm (Wbe “\ Wflmfl €6%§* w\ Wat/3W W0 Wig Put your ENTIRE answer, for each of the following three problems, on the back of the optical scanning sheet (in the boxes given for each problem). NOTHING will be graded that is on this sheet of paper. In order to receive partial credit, you MUST show computations. No work means no credit. 2—2) (a) (2 points) The pressure of a gas X in a sealed container was measured in the lab. It was found that the measured pressure was LESS than that predicted using the ideal gas law (PV = nRT). Using the PARTICULATE MODEL OF MATTER explain, in one to two sentences, why the measured pressure is less than that 'of the predicted pressure. ' (b) (8 points) The same gas X from above was condensed into the liquid phase. A second gas Y was also condensed into the liquid phase but it was found that the SECOND gas Y condensed at a LOWER temperature than the first gas X. Using the PARTICULATE MODEL OF MATTER explain, in one to two sentences, why these two gases condense at different temperatures, with all conditions other than temperature being the same (i.e. volume, amount of gas, and pressure). 2—3) (5 pts) The melting point of sodium chloride is 1074 K. Identify an ionic compound that has a higher melting point. Explain the reasoning for your choice. 2—4) A sensing device forvisible light needs a minimum of 56.0 photons in order to have enough energy to be triggered. If each photon has an energy of 3.83 x 10'19 J/photon: (a) (5 points) How much total energy is needed for the sensing device to be triggered? (b) (5 points) What is the wavelength of the photons being detected in nn? (0) (5 points) What is the energy of one mole of these photons? 23 . 4 Avogadro’s number = 6.022 x 10 Planck’s constant 6.63 x10 3 J 8 speed of light 0: 2.99 x 108m/s E=hv c=)\v 1 m = 1 x10'9 nm Periodic Table . . \ :wmwm Ami WWW' . ( V ‘ ' ‘ W»Wm‘. .Mw». :"v\vn\’.w\fim\‘m<? m‘mmv‘v 5mm ,.w.w§ [ {IA {12A 313 i413 5B 6B 7B 8B 113 213 isA ]4A tSA 6A [74 2E: g 843W m..va V ‘ NWWV. .. . V . ' ‘34 WM . mi 3 1 1 : C 2 i 11 _H I *He g 1.008 7 r 4.003 ’ ,3 4 ' 5 .6 7 ' 8 9 10 m 2 ELI .Be B C N O F Ne :6.941 9.012 10.81 12.01 14.01 16.00 19.00 20.18' '1 """"" “1'1 uuuu n "12 [13 14 15” u 16 17 ‘18 E 1 3 Na ‘Mg ,Al Si 8 c1 Ar 1 22.99 24.31 V 26.98 28.09 30.97 32.07 35.45 39.95% ;, j19_ W20 21 22 W 23 24 25 '26 '27 28 ‘29 (30 31 W32 33 34 535 136' g 4 :K ‘Ca Sc ‘Ti V (Cr Mn Fe Co (Ni (Cu 3Zn Ga Ge As Se gBr .Kr 3 239.10 40.08 44.964788 50.94 52.00 54.945585 58.93 58.69 «63.55 «65.39 69.72 72.61 74.92 78.96 379.90 83.81 . 41 > 42 743 7 44 '45 46 47 3 48 m4; """ 56wmsimw 52%”? 54 “i _“ 5 Rb Sr Y Zr Nb ‘ M0 Tc Ru Rh Pd Ag ‘ Cd ' In Sn C e 11 .Xe a: 285.47 87.62 88.91 91.22 92.91 95.94 (98) 101.1 102.9 9064:1079 112.4 114.8 118.7 1218421611269 131.3} E 55 V 56 57* 172W 73 74 75 76 77 78 ‘79 E80 ' E81 82' 83 84 :85 V 86 6 Cs ‘ Ba La I Hf Ta ; W Re Os » Ir Pt : Au Hg Tl Pb , Bi ,Po At - Rn 5; 132.9 137.3 138.9 178.5 180.9 1183.9 186.2 190.2 192.2 195.1 «197.0 200.6 204.4 207.2 209.0 (209) (210) (222) 87 ,88 89** 3104 {105 ‘106 ’107 108 '109 110 111 £112 2 _ 7 Fr 3 Ra Ac E Rf Db Sg Bh . Hs E Mt . g (223) 226.0 227.0 .(261) i062) (263) (262) (265) :(266) 4269) ;(272) ;(277) I j ...
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This note was uploaded on 02/03/2011 for the course CHEM 151 taught by Professor Staff during the Fall '08 term at University of Arizona- Tucson.

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Exam #2 - 1 l l 'l i F10 Chemistry 151‘ FORM A EXAM 2 The...

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