Final Exam Questions-- Answers

Final Exam Questions-- Answers - 1 Practice Multiple Choice...

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1 Practice Multiple Choice Questions for Final Exam, Chem 165 (ANSWER KEY) (Correct Answers Highlighted in Green/Bold ) 1. What type of chemical bond holds the atoms together within a water molecule? a) Ionic bond b) Non polar covalent bond c) Polar covalent bond d) Hydrogen bond 2. A non polar covalent bond would form in which of these pairs of atoms? a) Na Cl b) H Cl c) Li Br d) Se Br e) Br Br 3. The O H bond in CH 3 OH would be classified as a(n)… a) Ionic bond b) Non polar covalent bond c) Polar covalent bond d) Hydrogen bond 4. The Lewis structure for CS 2 is: a) b) c) d) 5. Each of the three resonance structures of NO 3 has how many lone pairs of electrons? a) 7 b) 8 c) 9 d) 10 e) 13
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2 6. What is the formal charge on the singly bonded oxygens in the Lewis structure for the carbonate ion? a) 2 b) 1 c) 0 d) +1 e) +2 7. The boron trifluoride (BF 3 ) molecule has what geometry? a) Tetrahedral b) Trigonal planar c) Pyramidal d) Trigonal bipiramidal 8. In the formic acid (HCO 2 H) molecule, the values of the bond angles, in degrees, are approximately: a) O–C–O = 180, C–O–H = 120 b) O–C–O = 120, C–O–H = 109.5 c) O–C–O = 180, C–O–H = 180 d) O–C–O = 109.5, C–O–H = 109.5 9. The hybridization of the oxygen atom in a water molecule is: a) sp b) sp 2 c) sp 3 d) sp 3 d e) sp 3 d 2 10. What functional group is highlighted (blue) in the molecule below? a) Ester b) Carboxylic acid c) Ketone d) Amine e) Amide
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3 11. Which of the following substances will have both dispersion forces and dipole dipole forces? a) HCl b) BCl 3 c) Br 2 d) H 2 e) CO 2 12. Which one of the following substances should exhibit hydrogen bonding in the liquid state? a) PH 3 b) H 2 c) H 2 S d) CH 4 e) NH 3 13. The number of nearest neighbors (atoms that make contact) around each atom in a face centered cubic lattice of a metal is a) 2 b) 4 c) 6 d) 8 e) 12 14. What phase exists at the point labeled c ? a) Liquid b) Gas c) Solid d) Non of the above e) All of the above
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4 15. Identify the conjugate base of HSO 4 - in the reaction H 2 PO 4 - + HSO 4 - H 3 PO 4 + SO 4 2- a) H 2 PO 4 - b) H 2 SO 4 c) H 2 O d) H 3 PO 4 e) SO 4 2- 16. If the pH = 10 for a Ca(OH) 2 solution, what is the concentration of Ca(OH) 2 ? a) 1.0 x 10 –10 b) 5.0 x 10 –11 c) 5.0 x 10 –3 d) 1.0 x 10 –2 e) 2.0 x 10 –2 17. Which of these acids is the strongest? a) H 2 S b) HF c) HCl d) HBr e) HI 18. What is the conjugate acid of SO 4 2 ? a) H 2 SO 4 b) HSO 4 c) SO 3 2 d) H 3 SO 4 + 19. The K a of HF is 6.8 x 10 4 . What is the pH of a 0.0400 M aqueous solution of KF ? a) 2.28 b) 2.43 c) 6.12 d) 7.88
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5 20. Entropy decreases when: a) Gases are formed from liquids. b)
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Final Exam Questions-- Answers - 1 Practice Multiple Choice...

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