19. Which of the following will increase the rate at which a solid dissolves in a liquid?
A. Lowering the temperature of the solvent.
C. Placing the solution in opaque pieces.
B. Grinding the solid into smaller pieces.
D. Supersaturating the solution.
20. Of the following, which will increase the solubility of a gas in water?
A. increasing the temperature
C. increasing the volume
B. increasing the pressure
D. decreasing the pressure
D. Solvent
21. What is the substance that dissolves in a solution called?
A. Alloy
B. Colloid
C. Solute
22. Which of the following statements is true about mixtures and solutions?
A All mixtures are solutions.
C. Solutions are heterogeneous mixtures.
B. A solution is a type of mixture.
D. All of the above
23. Under which conditions of temperature and pressure is a gas most soluble in water?
A. High temperature and low pressure
C. Low temperature and low pressure
B. High temperature and high pressure
D. Low temperature and high pressure
24. The solubility of NaCl in water at 20 °C is 36 g in 100 g of water. What kind of solution contains 18 g NaCl in 50 g of
water at 20 °C?
A. It is saturated.
C. It is supersaturated.
B. It is unsaturated.
D. It is dilute.
25. A 40% alcohol contains
A. 40 mL alcohol in 100 mL of water.
B. 40 mL alcohol in 60 mL of water.
C. 60 mL of alcohol in 100 mL of water.
D. 60 mL of alcohol in 40 mL of water.