[Bush] Chemistry Exam #4 - Fall 2007

[Bush] Chemistry Exam #4 - Fall 2007 - NAME Chemistry 1301...

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Unformatted text preview: NAME Chemistry 1301 Fall 2007 Exam #4 PLEASE READ THESE INSTRUCTIONS CAREFULLY BEFORE BEGINNING THIS EXAMINATION. Select the single best response to each question. There is only 93g best response to each question unless otherwise indicated in the question. There are 33 questions on this examination worth 3 points each. (Total of 100 points.) Check your test booklet to be sure that you have a complete exam with all 33 questions. Write your NAME on your Scantron answer sheet. Write your name on the first page of the test booklet also. Work each problem carefully on the test booklet or on the scratch paper provided. Then select the answer which you feel is the best response. ALL ANSWERS MUST APPEAR ON THE SCANTRON ANSWER SHEET. Your grade will be determined only by what appears on the Scantron, not by work on the test booklet. Look over your exam and work the easiest problems first, saving the more difficult ones for last. Be sure that you have correctly indicated your final choices on the Scantron answer sheet before turning in your paper. If a question is incorrectly marked on the Scantron, it will be counted wrong even if it was correctly marked on the test booklet. If you have any questions about any of the problems on this exam, it is your responsibility to ask for a clarification from the instructor during the examination. 2) 1. Calculate the frequency, in 5—1, of ultraviolet radiation that )t has a wavelength of 248 nm. (0 = 3.00 x 108 m/sec) (12}JJ 300M?e --—‘-" (‘§M> a) 82.7 ’3" 5% ‘-' 69(248095 9" a 1.21 x 1015 D. 15 :1): 121x10 S" e) none of the above 2. Which one of the following associations of a scientist and a discovery is NOT correct? a) Albert Einstein—explanation for the photoelectric effect b) Niels Bohr—planetary model of the hydrogen atom c) Ernest Rutherford—discovery of the nucleus Max Planck—wave equations for electrons in atoms Sckraéonfler e) Robert Millikenucharge on one electron 3. Which one of the following observations most clearly supports the conclusion that electrons have wave properties? electron diffraction patterns b) the photoelectric effect c) the scattering of alpha particles by metal foil d) the emission spectrum of hydrogen e) the existence of cathode II ll 4. Which one of the following observations most clearly supports the conclusion that electrons in atoms have quantized energies? a) electron diffraction patterns b) the photoelectric effect c) the scattering of alpha particles by metal foil d) the existence of cathode "rays" the emission spectrum of hydrogen 5. Which one of the following combinations of quantum numbers is not allowed? n l a) 4 3 b) 3 l @2 o d) 4 0 +1/2 +1/2 -1/2 —1/2 e) All are allowed. How many feorbitals can exist in the shell with n = 4,? a) l 3“ 2‘5 - o l b 3 " J 4‘ C) 5 CS) Pid}¥) (35,7 lass afigu§QZbéickatie e) some other number r94: 5,1, ‘J a) "2—2) "'3 4 amaze me passabia The electron configuration of Fe2+ in the ground state (lowest energy electron arrangement for the ion) is 0' b 1. 6 Fe 4» CAV15d’ *3 [Ar]3d {DS‘Elér b) [Ar]3d4452 452:3 db c) [Ar]3d54s1 Fe M ZATU‘S d) [Ar]3d5 e) none of the above Which of the following atoms has three and only three electrons in the p orbitals of its valence shell? (:3 Bl ‘SA b) Ba '2A» églx c) Ge ‘4/L TN€§LrUé3 d) Ga EMA e) none of the above According to the Periodic Table, what kind of an electron is added to the electron configuration of Sb to give the electron configuration of a neutral tellurium atom? Tfiusiflim-QLLMD a) 4f 2 ID 3 “a 2‘ 3 b) 4p aozfldss 4d Sp or [xx—34d as 39 c) 5s M \o: +0 Sp Q 5p e) 4d 10. Of the following elements, which is predicted to have the lowest first ionization energy? (9 b[fifiww\_ww&lwflk&m Ba b) Ca c) Si d) P e) Cl 11. Which one of the following subshell notations reflects an atom in the ground state? a) 1szzszzpz3s1 2p WW3; - - b) 1522522p63s3 utmm P {iQ c) 1532252352 ' 2? WE d) 1522522p‘53sz3d5 3? £514 flV-L 34: @ 1522522p6 :1 12. Which one of the following represents the correct electron configuration for the ground state (lowest energy state) of a neutral nitro en atom? _ g Nmn. Join; 25 2p (Jki1:= Zei- a) [He] (M) (T m )(T) Smouz PM (9) b)[He1 (T) mm M) mwnd-Vdéb “M” c) [He] (M) (MHT )( ) Emwmw‘m d) [He] (H) mm )( ) Wm‘optp. @ [He] (H) (T )(T )(T) WQWBQ MA lgyw‘ fi¢wn¢5m 13. Two different ions of the element 82Pb are commonly found. Consider the electron configuration of this element and predict what these two ions are most likely to be. a) Pb+ and Pb3+ //“4§ b) Pb+ and Pb4+ ampig W © Pb2+ and Pb4+ __2_3 d) Pb“ and Pb3+ L L e) Pb3+ and Pb5+ 4'2: 14. Which one of the following elements should have the most metallic character? a) iron [Lupe-I cesium c) sodium d) titanium e) calcium 15. Which one of the following elements should form the most ionic ’ bond with chlorine? (:9 K “masturwfitd&LL b) Al c) P d) N e) Br 16. According to the Aufbau principle which subshell is filled completely after the 55 subshell? a) 5p b) 4f c) 3d C5) 4d e) 5d 17. Atoms having the same electronegativities are expected to form: a) no bonds b) polar covalent bonds (:3 nonpolar covalent bonds d) ionic bonds e) something else 18. Which of the following species is best described by drawing, resonance structures? a) co2 w M b) BF4+ _. ;N\.. a .b./ \‘6‘ c) PF5 (,3: b. v’ ‘f d) NF3 N02" 54 ZCQH= 189’ Consider the compound crotonaldehyde, whose skeleton is given below. (Use this structure for both questions 19 and 20). Hint: only single pairs are shown connecting the atoms. Some bonds may require more than one pair. It's up to you to decide. H Ii H H I I I I H—Cl—Cz—C3—C4—O I H 19. How many valence electrons must be shown in the Lewis structure of the crotonaldehyde molecule above? a) 12 4C 4643 = ‘5 9: b) IO ICG): 6Q— C) 24 £3 .2— 69: 28 28.2" e) some other number 20. How many double bonds should appear in the Lewis structure of the crotonaldehyde molecule (above)? a) 0 ZCML shoux\\v“ H H H H SWIG—W b) l l I l I __ H'F*C—C‘”C"O 8a '06“ d) 3 H mIssmg LP“: 350-76? H H e) 4 H ' H W 21. From a consideration of the Lewis structure shown below, what is the formal charge on oxygen, nitrogen and chlorine? ' ' ‘l o‘okzxn on :- ;O —-N = Cl r’” o N c1 " We“: a) 0 o o / K; # b) +1 0 —1 65am 59Gb”: 4” @ —1 0 +1 W To: WM 59’ d) +1 —1 o _' 0 e) something else 22. If both bonded atoms are identical, which kind of bond is predicted to be the shortest? a) a bond formed by one pair of electrons b) a bond formed by two pairs of electrons (:> a bond formed by three pairs of electrons d) can't predict 23. Using the bond dissociation energies below, estimate the enthalpy for the reaction NEN(9)+ 3F—F(g) —> 2NF3(g) Bond Dissociation Energy ng/mol) NEN 946 F—F 159 N—F 272 a) -368 kJ/mol mam. G: Mchcx‘éo 4003’?- 'QJ/mob —209 kJ/mol mic. 5 F—FloartfiA + 303°! VJ/md\ c) +879 kJ/mol Wk 1 usmm‘é +IC946‘CJ/mol3 d) +604 kJ/mol .. 209 M/md} e) none of the above 24. Which one of the following elements is not a main group (representative) element? a) C b) Na c) Se (<3 Hg Wst’wn mQ‘ml e) Cl 25. The horizontal rows in the Periodic Table are called a) groups b) families (:) periods d) subshells e) orbits 26. Which element belongs to the group called the lanthanides? a) Fr (:9 Sm 0) Cu d) Xe e) U 27. Which of the following isoelectronic species would have the largest radius? a) Mg2+ 4: mmwhfia 10102.8“ madcaan b) M +11 M c) 02' +8 d) F" +q N3“ +7 28. Which of the following atoms is paramagnetic in atomic form? a) He gmwmuzqe’ b) Be @N d) Mg e) Zn 29. Which of the following orders of electronegativity is NOT correct? a)Si<P<N 0‘2. C:DDJ<:P < S h1>13 $540 c)I<Cl<Fd7_ d)Se<S<Ool¢. e)Si<N<0Cj4_ 30. How many pairs of electrons are there around the central Se atom in the Lewis structure of the following species? P3 SGF4 : _. ‘ _ I / F.- a) 2 V3, 59_ Q: : Q: g Sn_\ :. b) 3 F 4C0 = 35 l f" c) 4 ‘bL, .??: @ 5 e) 6 31. How many atoms of H will combine with one atom of P based on the Lewis Dot Symbols and the octet rule? a) 2 {ID 3 f3 555» -’F)\ c) 4 ‘4 L H d) 5 ‘ e) 6 ‘$ 3+¥\o(\m§|§n l SUEKLx' ‘YUFCKW 0233 32. Which one of the following is the best Lewis structure for » nitrous acid, HNOZ? {ah/e“: “(0+ M53+ZCDCQ2 {8 Q“ a) Co) (a) w b) (+0 (0) W CW 04 {A QmNmQ—H :qwh‘mb'wn _ WW? OMS ("3L mam» oddd N’Lr 4Lth anfi’ c) mm d) 6) WW Wd‘ 52“) C") ""‘6'~V odofi- “mgm .9: Tl\fi—H ME .. T .. 1b .p/(Q (o) :Q—W‘N—Qt :imfizfif H (+.) (-4) Ga) (.1) oust», twat” 0d:de ewm 33. According to Lewis theory, the total number of lone pair electrons in an NCl3 molecule is l 1 .. Z: 3 N 3 [OW \' i' c) 21 . : .- a ‘18 333 10 ...
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This note was uploaded on 04/08/2008 for the course CHE 1301 taught by Professor Klausmeyer during the Fall '08 term at Baylor.

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[Bush] Chemistry Exam #4 - Fall 2007 - NAME Chemistry 1301...

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