2010 Exam 3

2010 Exam 3 - Chem 1 15 — Exam 3 — 2 1 Which...

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Unformatted text preview: Chem 1 15 — Exam 3 — 04/07/10 2 1. Which combination of atoms is most likely to form an ionic bond? (a) A1 and F (b) P and H (c) C and 0 ((1) Si and 0 (e) S and Br 2. Arrange nitrogen, oxygen, phosphorus, and fluorine in order of increasing electronegativity. (@ N<O<P<F (m P<N<O<F (Q F<O<N<P m) F<N<O<P _ 3. What is the total number of valence electrons in a carbon dioxide molecule? (a) 4 (b) 8 (c) 16 (d) 20 (e) 22 __v 4. Select the most polar bond. (a) N—O (b) C—C (c) C—0 ((1) C—N (e) C—F v v _ 5. What is the formal charge on the central N atom in N20, given the following Lewis structure: :NEN—§: (a) 1 (b) 2 (C) 0 (d) ‘1 (e) —2 Chem 115 — Exam 3 ~ 04/07/10 6. Which of the following is a best Lewis structure for the phosphate ion? (a) . (a) (d) .. 00.0 / .. \ (+1)" ll ..(—1) :0: :0: g- P — 92 \ . o f l ..o°—°o.. 00 3- (b) .. : z (e) .6 00 o I .00_F|>—oo. : : l 3- C o . ( ) .0, O. O ‘9. ‘(ID 2 F3: 20: 7. Which of the following is the correct Lewis dot structure for IF3? (a) : (d) 517.; 00 I _ .F. : 3 — I: . / ’° °° I 'P: :13 3 (b) z (e) 3 f 3 °.\ II: — O. o I ./ 00. .‘ / \ o o i .P.’ 0.}... 3F : °.F° on Chem 115 — Exam 3 — 04/07/10 8. The central atom in XeF4 is surrounded by (a) 3 single bonds, 1 double bond and no lone pairs of electrons (b) 2 single bonds, 2 double bonds and no lone pairs of electrons (c) 3 single bonds, 1 double bond and 1 lone pairs of electrons (d) 4 single bonds, no double bonds and no lone pairs of electrons (e) 4 single bonds, no double bonds and 2 lone pairs of electrons 9. The formal charges on O and Br for the OBr’ ion are, respectively? (a) —2 and +1 (b) —2 and —1 (c) —1 and +1 (d) —1 and 0 (e) 0 and —1 10. Use the VSEPR model to identify which of the following molecules and ions will have a trigonal planar geometry and bent (angular) shape. (The central atom is always first in the formula.) (3) S02 (b) PC13 (C) BF 3 (d) NH3 (6) SF 6 1 1. Which of the following molecules is polar? (a) C14 (b) C32 (C) NH3 ((1) A1C13 (6) none is polar 12. Predict the actual bond angle in H28 using the VSEPR model. (a) more than 120° (b) between 1090 and 120° (0) between 90° and 109° (d) less than 90° Chem 115 a Exam 3 ~ 04/07/10 13. What is the bond hybridization for phosphorus in PF3? (a) Sp 03) Sp2 (c) sp3 (d) sp“ (e) sp3d 14. What is the bond hybridization for the central atom in a molecule with trigonal bipyramidal geometry, such as P135? (a) SP (b) spz (c) sp3 ((1) sp3d (e) Sp3d2 15. What is the bond hybridization for carbon in formaldehyde, CHzO (hint, draw the Lewis structure)? (a) Sp (b) 8132 (c) SP3 (d) sp“ (e) sp3d 16. How many pi bonds are there in N2, NEN? (a) 0 (b) 1 (C) 2 (d) 3 (e) It cannot be determined 17. What is the molecular formula for heptane? (a) C6H12 (b) C6H14 (C) C7Hl4 (d) C7H16 (e) C8H14 Chem 115 ~ Exam 3 — 04/07/10 18. What is the name of the following compound? CH3 CH3 l | CH3 CH CH2 CH2 CH CH2—CH3 (a) 2,5-diheptane (b) 2-ethyl—5~methylhexane (c) 3 ,6-dimethylheptane (d) 1 ,1 ,4—trimethylhexane (e) 2,5-dimethylheptane 19. Which of the following functional groups does NOT have an oxygen atom? (a) ketone (b) aldehyde (c) ester (d) carboxylic acid (6) amine 20. The reaction of Brz with unsaturated fats like those found in animal meat is an example of what type of reaction? (a) elimination (b) addition (0) substitution ((1) esterification (e) acid—base BONUS (5 pts)! .V "H 21. In which of the following molecules is the central carbon atom chiral? (a) CH2C12 (b) CH2FC1 (C) (d) CHFClBr (6) C02 :8 “mo :3 nmm NmN EN Sum Sm mvm Nvm 5mm 9me SN ONMN Em mm “0 Va EU 84 sh AWZ S «m PH 03 mm mm mm ca no .3 mm mm a om “v.63 0&3 ONE Qmmfi m6? 0&2 v.02 9: N31 ad: #03 um cm kn PH v0 5— Em Em uZ .5 00 we no we 3 we me No S ow . mm mm NR E 02 am am we 5 “2 5 gm mm 3 E E «m E m: v: m: N: E o: a: we 8H 9: 2: H: mm mm g as 38 38 :8 poem 3% 22 32 SE SE 3M: 0.2: Q: 32 32 32 am Z on a i F mm =< a : mo 9m B «H E S «m 6 3 mm a mm mm ; ow E M: E 2 3 E Q E 22 $2 . M22 2: me: E: 32 $2 32 22 mm a? 3.3 2.; . . ox ~ as am am 5 5 m4 2 Q am as o: .2 “N % mm NW G on $ WV 3 3 Q 3 Q NV 3 ow 8% 8.2 3% . . SQ N30 3.8 3.8 93% 8% 3mm 3% 0on 33m 3.? Q 5 mm 2 00 5 ea 5 _z 5 on =2 6 > F mm mm 5 0m 3 mm S 3 n vm mm mm 3 9m 3 mm 8 mm 3 CM Ma 8 :5 8: E E E E 6 m m mu‘ 9 {.mm . S 2 2 , _ \ 2.8 8.2 8.8 5.: 0z m o z n 3: $5 8: E <m <v <m \O m ‘1‘; f") <r m 0°3— v-‘< O v—4 0\ 00 am 35805 2: we @3ng ofiwocom . ...
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2010 Exam 3 - Chem 1 15 — Exam 3 — 2 1 Which...

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