KEY Exam2 1311 F10 v A - full version of F10 exam, questions are randomized for different version, keys PDF

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full version of F10 exam, questions are randomized for different version, keys included...

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Exam 2 1311 F10 Key

version A

1. Predict the ideal bond angles in GeCl4 . A. 120° B. 90° C. < 90° D. 109.5° E. 180° ____________________________________________________________________________________________________________

2. The formula for magnesium sulfite is: A. MgSO3 B. MnS C. MgS D. MgSO4 E. MnSO3 ____________________________________________________________________________________________________________

3. Valence bond theory predicts that iodine will use _____ hybrid orbitals in ICl2 -. A. sp3d2 B. None of these choices is correct. C. sp3d D. sp2 E. sp3 ____________________________________________________________________________________________________________

4. What is the molecular geometry (shape) of NOCl ?

A. B. C. D. E.

trigonal planar trigonal pyramidal linear tetrahedral bent

____________________________________________________________________________________________________________

5. In which of these pairs of atoms would the bond be the most polar? A. C C B. N C C. C Cl D. C H E. O C ____________________________________________________________________________________________________________

6. Which of these atoms is the most electronegative? A. As B. Cs C. Li D. Ge E. P ____________________________________________________________________________________________________________

7. Which of the following molecules has a net dipole moment (i.e. is polar)? A. KrF2 B. CCl4 C. CO2 D. BeCl2 E. SF2 ____________________________________________________________________________________________________________

8. Predict the actual bond angles in SF3 + . A. exactly 120° B. between 109.5° and 120° C. less than 90° D. between 90° and 109.5° E. more than 120° ____________________________________________________________________________________________________________

9. Predict the electron domain geometry around the central atom in BCl3 A. B. C. D. E.

trigonal bipyramidal trigonal planar trigonal pyramidal octahedral tetrahedral

____________________________________________________________________________________________________________

10. Complete this sentence: The PCl5 molecule has A. nonpolar bonds, and is a nonpolar molecule. B. nonpolar bonds, but is a polar molecule. C. polar bonds, but is a nonpolar molecule. D. polar bonds, and is a polar molecule. ____________________________________________________________________________________________________________

11. The number of resonance structures for the best Lewis structure of sulfur dioxide is: A. 4 B. there is only one structure (i.e. no resonance) C. 3 D. 2 ____________________________________________________________________________________________________________

12. Which response includes all the molecules below that do not follow the octet rule for the central atom? (1) H2S (2) BCl3 (3) PH3 (4) SF4 A. PH3 and SF4 B. BCl3 and PH3 C. BCl3 and SF4 D. All four Lewis structures obey the octet rule for the central atom E. H2S and BCl3 ____________________________________________________________________________________________________________

13. Which is the correct formula for copper(II) phosphate? A. Cu(PO3)2 B. Cu(PO4)2 C. Cu2PO3 D. Cu3(PO4)2 E. Cu2PO4 ____________________________________________________________________________________________________________

14. Predict the electron domain geometry around iodine, the central atom in the ion ICl2 ¯ : A. trigonal bipyramidal B. octahedral C. bent D. tetrahedral E. trigonal planar ____________________________________________________________________________________________________________

15. Indicate the type of hybrid orbitals used by the central atom in SF6. A. sp3d2 B. sp2 C. sp3 D. sp3d E. sp ____________________________________________________________________________________________________________

16. What is the name of PCl3? A. trichlorophosphide B. phosphorus trichlorate C. phosphorus trichloride D. phosphorus chloride E. phosphoric chloride ____________________________________________________________________________________________________________

17. Select the best Lewis structure for NOCl, a reactive material used as an ionizing solvent.

A. a B. b C. c D. d E. None of these choices is correct. ____________________________________________________________________________________________________________

18. What is the molecular geometry (shape) of ClF2 ¯ ? A. T-shaped B. tetrahedral C. bent D. see-saw E. linear ____________________________________________________________________________________________________________

19. What is the name of HClO4 ? A. hydrochlorate acid B. chlorous acid C. chloric acid D. hydrochloric acid E. perchloric acid ____________________________________________________________________________________________________________

20. Select the compound with the smallest magnitude lattice energy. A. NaCl(s) B. SrO(s) C. CsBr(s) D. KBr(s) E. CaO(s) ____________________________________________________________________________________________________________

21. The number of sigma bonds in the molecule below is: A. 16 B. 10 C. 19 D. 14 E. 12 ____________________________________________________________________________________________________________

22. What is the name for Al(NO3)3•2H2O ? A. aluminum(III) trinitrate dihydrate B. aluminum trinitrate dihydrate C. aluminum nitrate dihydrate D. aluminum nitrate hydrate E. aluminum nitrate ____________________________________________________________________________________________________________

23. Phosphoryl iodide is used in the preparation of organophosphorus derivatives and phosphate esters. Select the Lewis structure for POI3 which minimizes formal charges.

A.

B.

C.

D.

E.

____________________________________________________________________________________________________________

24. What is the formula for the binary compound formed by calcium and selenium? A. CaSe3 B. CaSe2 C. Ca3Se D. CaSe E. Ca2Se ____________________________________________________________________________________________________________

25. In the best Lewis structure of the iodate ion, IO3 -, the formal charge on the central iodine atom is: A. 0 B. -2 C. +2 D. -1 E. +1 ____________________________________________________________________________________________________________

26. Which of these compounds is most likely to be ionic? A. GaAs B. NO2 C. H2O D. SrBr2 E. CBr4 ____________________________________________________________________________________________________________

27. The average Te–O bond order in TeO4 2– is: A. 1.0 B. 1.5 C. 1.33 D. 1.66 E. 2.0 ____________________________________________________________________________________________________________

28. The compound, NaH2PO4, is present in many baking powders. What is its name? A. sodium hydrophosphate B. sodium dihydride phosphate C. sodium hydrogen phosphate D. sodium biphosphate E. sodium dihydrogen phosphate ____________________________________________________________________________________________________________

29. What is the name of the compound formed when H2S gas is dissolved in water? A. hydrosulfuric acid B. sulfuric acid C. hydrosulfurous acid D. sulfidic acid E. sulfurous acid ____________________________________________________________________________________________________________

30. Which one of the following Lewis structures is definitely incorrect? A. NO2

B. SO2

C. BeCl2

D. CO32¯

E. CH4

____________________________________________________________________________________________________________

31. Lithium forms compounds which are used in dry cells and storage batteries and in high-temperature lubricants. It has two naturally occurring isotopes, 6Li (atomic mass = 6.015121 amu) and 7Li (atomic mass = 7.016003 amu). Lithium has an average atomic mass of 6.9409 amu. What is the percent abundance of lithium6? A. 7.503% B. 46.16% C. 6.080% D. 92.50% E. 86.66% ____________________________________________________________________________________________________________

32. Which of these choices is the best Lewis structure for ozone, O3? A. B. C. D. E. ____________________________________________________________________________________________________________

33. Select the best Lewis structure for nitrogen trifluoride, NF3.

A. B. C. D. E.

a b c d e

____________________________________________________________________________________________________________

34. The ideal value for the bond angle indicated by "a" in the illustration below is: A. B. C. D. E.

180° 109.5° 120° 90° 270°

____________________________________________________________________________________________________________

35. The F S A. 180° B. 120° C. 90° and 180° D. 90° and 120° E. 109.5°

F bond angles in SF6 are:

____________________________________________________________________________________________________________

36. Which of the following is the empirical formula for C4H10O2 ? A. C8H20O4 B. C2H5O C. CH2.5O0.5 D. C2H5 E. C4H10O2 ____________________________________________________________________________________________________________

37. Select the Lewis structure for XeO2F2 which correctly minimizes formal charges.

A. a B. b C. c D. d E. e

____________________________________________________________________________________________________________

38. Diiodine pentaoxide is used as an oxidizing agent that converts carbon monoxide to carbon dioxide. What is its chemical formula? A. I2O5 B. 2IO5 C. (IO5)2 D. I5O2 E. IO5 ____________________________________________________________________________________________________________

39. What is the molecular geometry (shape) of BrF4 ¯ ? A. square pyramidal B. octahedral C. tetrahedral D. see-saw E. square planar ____________________________________________________________________________________________________________...