Question

Hydrogen bonds are essentially a stronger version of which int force? 5. a. Ion-dipole forces b. London forces c. Dipole-dipole foces d. lon-ion forces 6. Increasing the pressure by 1000-fold on a solid or liquid dramatically decreases its volume. a. causes it to undergo thermal expansion. b. significantly decreases the density. c. does not have a significant effect on the volume. d. 7. A gas at 550 torr and 1.2 liters is allowed to expand to 4.3 liters. What is the final pressure of the gas? a. 2800 torr b. 1070 mmHg c. 2000 mmHg d. 150 mmHg 8. Which one of the following is a common property of gases? a. High densities b. Exhibit intermolecular forces c. Mix thoroughly d. High freezing points e. None of the above. Which of the following intermolecular forces is strongest? 9. a. Hydrogen bonding b. Dipole-dipole forces c. Ion-dipole forces d. London forces 10. 25 mL of 3.0 M sulfuric acid is diluted to 750 mL with water. What is the molarity of the resulting solution? a, 90M b. 0.011 M c. 10 M d. 0.10 M

Answer 1

Questions 5, 6, 8 , and 9 are by definition.

7.

PV = constant, boyle's law

P1 = 550 torr = 0.72 atm; V1 = 1.2 L; V2 = 4.3L; P2 = ?

P2 = (P1V1) / V2 = (0.72*1.2L) / 4.3L = 0.197 atm = 150 torr = 150 mmHg

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10. Use M1V1 = M2V2 dilution formula

M1 = 3M; V1 = 25 mL; M2 = ?; V2 = 750 mL

M2 = (M1V1/V2) = (3 x 25 mL) / (750 mL) = 0.1 M

molarity = 0.1M

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