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Basic Chemistry Practice Test: Properties of Solutions
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Here are some properties of solutions: Homogeneous mixture: A solution is a homogeneous mixture of two or more substances. The particles of a solution are smaller than 10-9 meters in diameter and are too small to be seen by the naked eye. All components of a solution appear as a single phase. Colligative properties: These are the physical changes that occur when a solute is added to a solvent. Colligative properties are determined by the number of solute particles present, as well as the amount of solvent present. Solubility: This is the ability of a compound to dissolve in water. The... Show more
Basic Chemistry Practice Test: Properties of Solutions
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25 Questions

1. The phrase 'like dissolves like' refers to the fact that __________.
2. The molarity of urea in a solution prepared by dissolving 16 g of urea (MW = 60.0 g/mol) in 39 g of H2O is__________ M. The density of the solution is 1.3 g/mL.
3. The concentration (M) of HCl in a solution prepared by dissolving 5.5 g of HCl in 200 g of C2H6O is__________ M. The density of the solution is 0.79 g/mL.
4. Determine the fraction of ionization of HX if a solution prepared by dissolving 0.020 mol of HX in 115 g of water freezes at -0.47 °C. The molal freezing-point-depression constant of water is 1.86 °C/m.
5. A solution contains 15 ppm of benzene. The density of the solution is 1.00 g/mL. This means that __________.
6. On a clear day at sea level, with a temperature of 25 °C, the partial pressure of N2 in air is 0.78 atm and the concentration of nitrogen in water is 5.3 × 10-4M. When the partial pressure of N2 is __________ atm, the concentration in water is 1.1 × 10-3M.
7. A solution is prepared by dissolving 23.7 g of CaCl2 in 375 g of water. The density of the resulting solution is 1.05 g/mL. The concentration of CaCl2 in this solution is __________ molal.
8. Which one of the following concentration units varies with temperature?
9. The vapor pressure of pure ethanol at 60 °C is 0.459 atm. Raoult's Law predicts that a solution prepared by dissolving 10.0 mmol naphthalene (nonvolatile) in 90.0 mmol ethanol will have a vapor pressure of __________ atm.
10. A solution containing 10.0 g of an unknown liquid and 90.0 g water has a freezing point of -3.33 °C. Given Kf = 1.86°C/m for water, the molar mass of the unknown liquid is ________ g/mol.
11. The vapor pressure of pure water at 25 °C is 23.8 torr. What is the vapor pressure (torr) of water above asolution prepared by dissolving 18.0 g of glucose (a nonelectrolyte, MW = 180.0 g/mol) in 95.0 g of water?
12. The magnitudes of Kf and of Kb depend on the identity of the __________.
13. An aqueous solution of a soluble compound (a nonelectrolyte) is prepared by dissolving 33.2 g of the compound in sufficient water to form 250 mL of solution. The solution has an osmotic pressure of 1.2 atm at 25.0 °C What is the molar mass (g/mL) of the compound?
14. Which of the following is not a colloid?
15. A solution contains 11% by mass of sodium chloride. This means that __________.
16. A solution with a concentration higher than the solubility is __________.
17. A sample of potassium nitrate (49.0 g) is dissolved in 101 g of water at 100 °C with precautions taken to avoid evaporation of any water. The solution is cooled to 30.0 °C and a small amount of precipitate is observed. Thissolution is __________.
18. A solution is prepared by dissolving 15.0 g of NH3 in 250 g of water. The density of the resulting solution is 0.974 g/mL. The molarity of NH3 in the solution is __________.
19. The principal reason for the extremely low solubility of NaCl in benzene (C6H6 ) is the __________.
20. A solution contains 28% phosphoric acid by mass. This means that __________.
21. Which of the following liquids will have the lowest freezing point?
22. As the concentration of a solute in a solution increases, the freezing point of the solution __________ and the vapor pressure of the solution __________.
23. In a saturated solution of a salt in water, __________.
24. A solution is prepared by dissolving 23.7 g of CaCl2 in 375 g of water. The density of the resulting solution is 1.05 g/mL. The concentration of Cl- in this solution is __________ M.
25. Which of the following cannot be a colloid?

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