EP 5 Sample Ch 15 questions

ep 5 review 2 midterm 1

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.

____ 1. How does the surface tension of water compare with the surface tensions of most other liquids?
a. It is lower.
b. It is about the same.
c. It is higher.
d. It is higher when a surfactant is added.


____ 2. What causes water's low vapor pressure?
a. dispersion forces c. hydrogen bonding
b. covalent bonding d. ionic attractions


____ 3. What is the shape of the water molecule?
a. linear c. trigonal planar
b. tetrahedral d. bent


____ 4. Which of the following is primarily responsible for holding water molecules together in the liquid state?
a. dispersion forces c. ionic bonds
b. hydrogen bonds d. polar covalent bonds


____ 5. Which atom in a water molecule has the greatest electronegativity?
a. one of the hydrogen atoms
b. both hydrogen atoms
c. the oxygen atom
d. There is no difference in the electronegativities of the atoms in a water molecule.


____ 6. The bonds between adjacent water molecules are called ____.
a. hydrogen bonds c. nonpolar covalent bonds
b. ionic bonds d. polar covalent bonds


____ 7. What is primarily responsible for the surface tension of water?
a. dispersion forces c. ionic attractions
b. hydrogen bonding d. covalent bonding


____ 8. Which of the following is NOT a result of surface tension in water?
a. Surface area is maximized.
b. Water has an unusually low vapor pressure.
c. Surface appears to have a "skin."
d. Drops tend to become spherical.


____ 9. Surface tension ____.
a. is the inward force which tends to minimize the surface area of a liquid
b. may be increased by detergents
c. is decreased by hydrogen bonding
d. causes beads of water to spread out


____ 10. The bonds between the hydrogen and oxygen atoms in a water molecule are ____.
a. hydrogen bonds c. nonpolar covalent bonds
b. ionic bonds d. polar covalent bonds


____ 11. How much heat is absorbed when 6.30 g of water melts?
a. 21 kJ c. 2.10 kJ
b. 0.210 kJ d. 21.0 J


____ 12. The fact that ice is less dense than water is related to the fact that ____.
a. the molecular structure of ice is much less orderly than that of water
b. the molecules of ice are held to each other by covalent bonding
c. ice has a molecular structure in which water molecules are arranged randomly
d. ice has a molecular structure that is an open framework held together by hydrogen bonds


____ 13. Which is responsible for the high thermal energy required to melt ice?
a. covalent bonding c. hydrogen bonding
b. dispersion forces d. ionic attractions


____ 14. What is the term for the dissolving medium in a solution?
a. solvent c. solvator
b. solute d. emulsifier


____ 15. A solution has which of the following properties?
a. Gravity separates its parts.
b. The top layer is different in composition than the bottom layer.
c. The average diameter of its solute particles usually is less than 1 nm.
d. A filter can remove the solute.


____ 16. Which of the following substances is the most soluble in water?
a. sodium chloride c. bromine
b. methane d. carbon


____ 17. What occurs in solvation?
a. Solute ions separate from solvent molecules.
b. Solvent molecules surround solute ions.
c. Solvent molecules bind covalently to solute molecules.
d. Ionic compounds are formed.


____ 18. Which of the following substances dissolves most readily in gasoline?
a. CH c. NH
b. HCl d. NaBr


____ 19. A solution is a mixture ____.
a. from which the solute can be filtered
b. that has the same properties throughout
c. that is heterogeneous
d. in which a solid solute is always dissolved in a liquid solvent


____ 20. Predict which one of the following compounds would be insoluble in water.
a. NaCl c. CF
b. HCl d. CuSO


____ 21. Why are two nonpolar substances able to dissolve in each other?
a. They have similar attractive forces in their molecules.
b. They combine to produce a polar substance.
c. There is no attractive force between them.
d. Nonpolar substances cannot dissolve in each other.


____ 22. Which of these would you expect to be soluble in the nonpolar solvent carbon disulfide, CS ?
a. c. NaCl
b. CI d. SnS


____ 23. Which of the following substances dissolves most readily in water?
a. BaSO c. NH
b. CaCO d. CH


____ 24. What type of compound is always an electrolyte?
a. polar covalent c. ionic
b. nonpolar covalent d. network solid


____ 25. An electric current can be conducted by ____.
a. methane gas c. a salt solution
b. a sugar solution d. rubbing alcohol


____ 26. Which of the following compounds conducts electricity only in the molten state?
a. sodium bromide c. calcium hydroxide
b. magnesium sulfate d. barium sulfate


____ 27. Which of the following compounds is a nonelectrolyte?
a. sodium bromide c. copper chloride
b. magnesium sulfate d. carbon tetrachloride


____ 28. Which of the following compounds is an electrolyte?
a. rubbing alcohol c. carbon tetrachloride
b. sugar d. sodium hydroxide


____ 29. Which of the following compounds is a nonelectrolyte when pure, but an electrolyte when dissolved in water?
a. rubbing alcohol c. carbon tetrachloride
b. sugar d. ammonia


____ 30. Which of the following are weak electrolytes in water?
a. ionic compounds that partially dissociate in water
b. ionic compounds that are soluble
c. polar compounds that ionize
d. nonpolar compounds that do not ionize


MULTIPLE CHOICE

1. ANS: C DIF: L1 REF: p. 447 OBJ: 15.1.1

2. ANS: C DIF: L1 REF: p. 447 OBJ: 15.1.1

3. ANS: D DIF: L2 REF: p. 446 OBJ: 15.1.1

4. ANS: B DIF: L2 REF: p. 446 OBJ: 15.1.1

5. ANS: C DIF: L2 REF: p. 446 OBJ: 15.1.1

6. ANS: A DIF: L2 REF: p. 446 OBJ: 15.1.1

7. ANS: B DIF: L2 REF: p. 446, p. 447
OBJ: 15.1.1

8. ANS: A DIF: L2 REF: p. 447 OBJ: 15.1.1

9. ANS: A DIF: L2 REF: p. 447 OBJ: 15.1.1

10. ANS: D DIF: L3 REF: p. 446 OBJ: 15.1.1

11. ANS: C DIF: L1 REF: p. 449 OBJ: 15.1.2

12. ANS: D DIF: L2 REF: p. 448, p. 449
OBJ: 15.1.2

13. ANS: C DIF: L3 REF: p. 449 OBJ: 15.1.2

14. ANS: A DIF: L1 REF: p. 450 OBJ: 15.2.1

15. ANS: C DIF: L2 REF: p. 450 OBJ: 15.2.1

16. ANS: A DIF: L2 REF: p. 451 OBJ: 15.2.2

17. ANS: B DIF: L2 REF: p. 451 OBJ: 15.2.2

18. ANS: A DIF: L2 REF: p. 451 OBJ: 15.2.2

19. ANS: B DIF: L3 REF: p. 450 OBJ: 15.2.2

20. ANS: C DIF: L3 REF: p. 451 OBJ: 15.2.2

21. ANS: A DIF: L3 REF: p. 451 OBJ: 15.2.2

22. ANS: B DIF: L3 REF: p. 451 OBJ: 15.2.2

23. ANS: C DIF: L3 REF: p. 451, p. 453
OBJ: 15.2.2

24. ANS: C DIF: L1 REF: p. 452 OBJ: 15.2.3

25. ANS: C DIF: L1 REF: p. 452, p. 453
OBJ: 15.2.3

26. ANS: D DIF: L2 REF: p. 452 OBJ: 15.2.3

27. ANS: D DIF: L2 REF: p. 452 OBJ: 15.2.3

28. ANS: D DIF: L2 REF: p. 453 OBJ: 15.2.3

29. ANS: D DIF: L2 REF: p. 453 OBJ: 15.2.3

30. ANS: A DIF: L2 REF: p. 453 OBJ: 15.2.3