Solution Test

14. What is the molarity of a solution that contains 0.202 mol KCl in 7.98 L solution? A) 0.0132 M C) 0.459 M B) 0.0253 M D) 1.363 M

0.0253 M

20. The freezing point of an aqueous solution that contains a nonelectrolyte is -8.0ºC. What is the molal concentration of the solution? The molal freezing-point constant for water is -1.86°C/m.

4.3 m

15. How many moles of ions are produced by the dissociation of 1 mol of Al2(CO3)3?

5 mole

25. Stirring increases the rate of dissolution because it

Brings fresh solvent into contact with the solute

22. An apparatus for testing conductivity is placed in a solution. The power supply is turned on and the light bulb glows brightly. This indicates that the solution A) is heterogeneous. C) contains an electrolyte. B) is supersaturated. D) is saturated.

Contains an electrolyte

16. Which of the following pairs of solutions produces a precipitate when combined? A) Cu(NO3)2 and NaCl C) B) Fe(NO3)3 and MgCl2 D) CaCl2 and NaNO3

Cu(NO3)2 and K2CO3

13. As temperature increases, solubility of gases in liquids

Decreases

24. Which of the following decreases the average kinetic energy of solvent molecules?

Decreasing the temperature

17. The separation of ions that occurs when an ionic compound dissolves is called

Dissociation

18. The formula for the hydronium ion is A) H+. C) H3O-. B) H2O+. D) H3O+.

H3O+

23. Increasing the surface area of the solute

Increases the rate of dissolution

A solute crystal is dropped into a solution containing dissolved solute. It falls to the bottom of the beaker and does not dissolve after vigorous stirring. What does this indicate about the solution?

It is probably saturated

19. Colligative properties depend on A) the identity of the solute particles. B) the concentration of the solute particles. C) the physical properties of the solute particles. D) the boiling point and freezing point of the solution.

The concentration of solute particles

Which of the following is an example of a nonpolar solvent?

Toluene

Which mixture contains visible particles that settle out unless the mixture is stirred?

a suspension

21. Compared with a 0.01 m sugar solution, a 0.01 m KCl solution has

about twice the freezing-point depression

A metal solution is a(n)

alloy.

28. Which of the following is likely to produce crystals if disturbed? A) an unsaturated solution C) a saturated solution B) a supersaturated solution D) an electrolytic solution

b

35. What is the molality of a solution that contains 5.10 mol KNO3 in 4.47 kg water? (molar mass of KNO3 = 101.11 g/mol) A) 0.315 m C) 1.02 m B) 0.779 m D) 1.14 m

d

A substance whose water solution is a good conductor of electricity is a(n)

electrolyte.

12. Effervescence is the

escape of gas from a gas-liquid solution.

26. Which of the following will dissolve most slowly?

large salt crystals in unstirred water

Which of the following will disolve most rapidly?

powdered sugar in hot water

The Tyndall effect is used to distinguish between

solutions and colloids

Which of the following is a nonelectrolyte?

sugar

27. If the amount of solute present in a solution at a given temperature is less than the maximum amount that can dissolve at that temperature, the solution is said to be A) saturated. C) supersaturated. B) D) concentrated.

unsaturated.

Which of the following does not increase the rate of dissolving a solid in water?

using larger pieces of solid

Which of the following is a heterogeneous mixture?

whole wheat bread