PracticeExam1aCHE102

PracticeExam1aCHE102 - 1 In a saturated solution of a salt...

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1. In a saturated solution of a salt in water, __________. A) the rate of crystallization > the rate of dissolution B) the rate of dissolution > the rate of crystallization C) seed crystal addition may cause massive crystallization D) the rate of crystallization = the rate of dissolution E) addition of more water causes massive crystallization 2. The solubility of nitrogen gas in water at 25 °C and a nitrogen pressure of 1.0 atm is 6.9 × The solubility of nitrogen in water at a nitrogen pressure of 0.80 atm is __________ M. -4 10 M A) 5.5 × -4 10 B) 8.6 × -4 10 C) 1.2 × 3 10 D) 3.7 × -3 10 E) 0.80 3. What is the molarity of sodium chloride in solution that is 13.0% by mass sodium chloride and that has a density of 1.10 g/mL? A) 143 B) 2.45 C) 2.56 D) 2.23 E) 1.43 × -2 10 Continued on next page 1
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Use the above diagram to answer the following questions 4 and 5. 4. 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. This solution is __________. A) hydrated B) placated C) saturated D) unsaturated E) supersaturated 5. 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 no precipitate is observed. This solution is __________. A) hydrated B) placated C) saturated D) unsaturated E) supersaturated 2
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Continued on next page Ammonium nitrate (NH 4 NO 3 ) dissolves readily in water even though the disso is endothermic 6. lution by 26.4 kJ/mol. The solution process is spontaneous because __________. upon addition of the solute A) the vapor pressure of the water decreases B) osmotic properties predict this behavior C) of the decrease in enthalpy upon addition of the solute D) of the increase in enthalpy upon dissolution of this strong electrolyte E)
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This note was uploaded on 04/08/2008 for the course CHE 102 taught by Professor Watson during the Spring '08 term at SUNY Buffalo.

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PracticeExam1aCHE102 - 1 In a saturated solution of a salt...

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