[Bush] Chemistry Exam #4 - Spring 2006

[Bush] Chemistry Exam #4 - Spring 2006 - NAME Chemistry...

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Unformatted text preview: NAME Chemistry 1301-02 Spring 2006 (M. A. Busch) Exam #4 PLEASE READ THESE INSTRUCTIONS CAREFULLY BEFORE BEGINNING THIS EXAMINATION. Select the single @ response to each question. There is only $6; best response to each question unless otherwise indicated in the question. There are 35 questions on this examination each worth 2.86 points. (Total of 100 points.) Check your test booklet to be sure that you have a complete exam with all 35 questions. Write your NAME and SECTION NUMBER (2) 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 that you feel is the M response. ALL ANSWERS MUST APPEAR ON THE SCANTRON. Your grade will be determined o_nly_ 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 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. 1) Which fl ofthe following ions has a noble gas electron configuration? A) Cr3+ B) Fe“ .. 1' c3“ :3: = [Ar] 32' n " E) Zn2+ 2) A compound is found to form between As and Br. What is the most likely formula for this compound if all atoms obey the octet rule? A) AsBr ” . w . .. C ASzBl'g ' - ‘ - S a. ‘ ASBI’} MM 5;: need-A lo, 0 l )A53Br 5 valonco e: ’7 vatonco o: o' OB)”: 3 What is the correct formula for the product of the reaction of strontium metal and nitrogen? SF3N2 ' 2% :31. Sr- ‘e' - animal D) smN3 lose» 2 VamMLQ: Pub up 3 2 5’“ wk E) SN} 3 Wm c: lg:an 4) Which m of the following represents the equation associated with the lattice energy for NaCl? A) Na(s) + 1/2 Clz(g) —> NaCl(s) B) Na+ (g) + 1/2 Clz(g) + e' —> NaCl(s) , ‘ C) Na(s) + Cl'(g) —> NaCl(s)+e' \oN) uniea CICQJ plow» 5073* SM a+ (g) + (31‘ (g) ~> NaCl(s) E) Na(s) + 1/2 Clg(g) —> NaCl(g) 5) How many covalent bonds does oxygen tend to form? A) 1 g .5. Mama 2 move}; L0; D)4 ‘ . sdei H E)6 09’ H b veaan e“ 6) Which combination of atoms would be most likely to produce an ionic bond? A) Si, C B Cl @g’l F quM + nonmam D) C, H E) S, Br 7) Which combination of atoms would be most likely to produce a covalent bond? A) K, O jB CU’FSe 2 nonan CALM; m PWW D) Fe, S E) Al, Cl 8) According to the octet rule, the total number of lone pair electrons in an NC13 molecule (counting those on N and all Cl atoms) is A) 0. . B) 1. ' .. 6350. :0: 9) How many valence electrons are shown in the Lewis structure of N03-? Include charge adjustment, if any. A) 11 B) 15 C) 22 + 3X 1 S D 23 elm 10) Select the best Lewis structure for OFz. (Formal charges are not indicated.) «an F‘ WWKOI A) B) (59 D) E) m) :0: \ cadd, *‘ -‘ +1 +\ 2003 ‘8?“— /\ film 00 oo 00 .. .. .. .0 .. .. oo oo 00 I — ' +0 b+2€7)=20 :F’F*O: F=o—F: :F-o-F: F=F—O: -F F- w/ .0 O. O. I ZOQ‘ I80.” a“ szxquLWge ‘8‘; l 1) Which w of the following structures is the best Lewis structure for Xer? A) B) c233. Fm) «teammch Ax pwuwmcxiej Qkpcnud K9 D) E) add» 82 Q2 “ ‘ ‘ 1‘ addix') \— may: JULW 203» 9 mp8 4D Odrei' “0* end-BK 8+ 20‘) : 21 12) Which gr; ofthe following species does not obey the octet rule? A) CH4 B NH3 dish 9: dexer D) H20 E) CO3 13) How many pairs of electrons are there around the central atom in the Lewis structure 0fthe following species? 881:4 iCb+As Spam if}, A)? l E. B) 3 g 59, ’ _ 4 \ - £35 L E' E) 6 a H 14) Predict which ofthe following bonds would be the longest. A) H—H . B) 02 Smgle) W) mph;- C~ )C=C ah) Q E) EC H 4A m5 smcul gramme} 15) Estimate AH°, in U, for the following reaction from the bond energies given. Hz (a) + 12 (g) -> 2 HI (g) Bond energy (kJ/mol): H—H, 436; H—I, 297; I—I, 151. All bonds are single. 35;; W 10mm- tome madQ 0-290 ISM?) 430,145: - -‘7 k3 @3290 C mol 4% 71770:) flea—M) ” 7531 \mot I-ZL \mot H—Ti m 2 rrol 54‘1- 16) Which o_n_e of the following processes would be expected to be exothermic? All reactions occur in the Born Haber cycle to compute lattice energy for ionic compounds. A) K(s)-> K(g) 5013th B) K 19—» K*(g) + e- tmlgamon armscj C) Brz (l) ” Brz (8) Wm @r(g) + e“ a Bag .QLndrc/n cnflindxj 17) How many bonding pairs of electrons are found in nitrogen gas, N2? A)1 C132 3 O. : O D)4 N’M' E)5 18) Which one ofthe following bonds is most covalent? C—C 0—11 2 \mhaak M malted-o C) H—F D) Ca—Cl E) S—Cl 19) Which one ofthe following bondsa is most ionic? A) Cl—N fiC-F mm + noonwicd -Cl D) Si—Si Odd-Veal cgcmd: m We Tabb E) C—H 20) How many valence electrons are there in one atom of Be? & C 3 ‘ D)” 6vc>a¢3 2A E)5 21) Which of the following elements is the most electronegative? A) K B) P C) A! +0.0 field of) PW,EW Mg l 22) Which of the following elements is the least electronegative? A) El B) O - .__. £925 barium 83+ \% WC law E) Ca 23) In the structure shown, what is the formal charge on H? i H-9=N~e a). 0119M l Wmfi-Nma 7’ g -1 MS I win \aml'ifl C) +1 D)-2 O Fwka E)+2 24) In the structure shown, what is the formal charge on O? :51: l H—Ezo—E: g); (LCM (o mnaémmcmyh D) g W 4t ’UDNLV\ loonch EH4 +2 Mimwige 25) According to VSEPR theory, the molecular geometry of SF6 is predicted to be A) tetrahedral. B) square planar. C square-based pyramidal. octahedral. ) trigonal bipyramidal. floats) = c Axe vmma‘; 5'+2(e=3+t -_~. 18 e“ 2 The electron group geometry ofN in the ion N02‘ is co ,, fitrigonal planar. / N\ a c N Axa-E B) tetrahedral. :O/ O'. / \\ . C) trigonal bypyramidal. ,' a. ,- .6 o: D) octahedral. . ,' “o a E) none ofthese 27) Assume one I is the center atom and the other two are singly bonded to the center atom. The electron group geometg around the central iodine in 13- is I A linear. _l_ _ I @rigonal bypyramidal. 2 ("H 2’ +B " S -‘ 1'. )tetrahedral. “ l AX D) octahedral. T 2E3 E) none ofthese 28) What is the appropriate VSEPR notation for the central atom B in BF3? A) sz B) AXzE .5 (a +3) 2 3 @Axg AX E E) ijiz2 M3 29) What is the appropriate VSEPR notation for the central atom S in H28? A) AX; B)AX2E i 2 : E AX3 209* 3 4 M2 2 @AXZEZ )AX4 30) Which w ofthe following molecules would be polar? A) PCl5 B) CO; C) BCI; 3 I) According to VSEPR theory, XeF4 has what molecular geometry? A) tetrahedral °' F 1 ‘2) 9: DD, .0 o. . - l P / B) trigonal pyramidal z b P ,; x2. \ C) octahedral 3?) 30 ;Q N D see-saw p @cware planar N4 E2 32) If all bonds between C] and F are single, the molecular geometfl ofClF3 is predicted to be A) trigonal planar l: B) tetrahedral Q C) seesaw J5, ‘ 5 ,' l _. D) trigonal pyramid - Cl.- F l l‘Sl’Qlo‘Q @T-shaped . l 33) The bond angle in the molecule SO2 is expected to be about A) 90° B) 109.5° ’ ' 8 @120° ..o// \ on D) 180° -’ ‘- -‘ O E) 45° AXZE Manet; plaxicwk '30 34) How many resonance forms can be drawn for the ion C03}? A) 1 u _ _ ".0: :01 I 0" C) C. Q. t C. . - / \ . ,. / \ ' . / \\ - D) 4 0.3 (2/ "0" JG -0' E) 5 35) If bromine is the central atom and all Br to Cl bonds are single, the molecular geometry ofthe molecule BrCl5 should be ? A) T—shape i (—1 *3) l 6 B) trigonal pyramid C) trigonal plane Cl D) seesaw 0’ .\ I / Cl | :l ind @ b d 'd ’ Br \ .2] ‘ ' quare- ase pyrami C‘ , , C I Pgnm k ...
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This note was uploaded on 04/08/2008 for the course CHE 1301 taught by Professor Klausmeyer during the Spring '08 term at Baylor.

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[Bush] Chemistry Exam #4 - Spring 2006 - NAME Chemistry...

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