Colligative Properties

Chemistry
Tutor: None Selected Time limit: 1 Day

QUESTION 1

Properties of a solution that depend only on the ratio of the number of particles of solute and solvent in the solution are known as __________. intensive properties physical properties colligative properties chemical properties 3 points QUESTION 2

How does adding a non-volatile solute to a pure solvent affect the vapor pressure of the pure solvent? The solution will have a lower vapor pressure than the pure solvent. The solution will have a higher vapor pressure than the pure solvent. The solvent’s vapor pressure will not be affected. The solvent’s vapor pressure will most likely change, but not in a predictable way. 3 points QUESTION 3

To melt the ice on your driveway, you can use 2 moles of rock salt (NaCl) or 2 moles of calcium chloride (CaCl2). Which solute will have the greatest effect and why? NaCl because it is completely soluble in water NaCl because it produces fewer moles of solute particles per mole of compound CaCl2 because it produces more moles of solute particles per mole of compound CaCl2 because it is less volatile than NaCl 3 points QUESTION 4

What is the molality of a solution that contains 1.50 moles of NaOH in 250 mL of water? (The density of water is equal to 1.0 .) 6.0 m 0.006 m 0.375 m 375 m 3 points QUESTION 5

A 300 gram sample of pure water exerts a vapor pressure of 750 millimeters of mercury on the walls of its container. If 0.27 moles of glucose (C6H12O6) is added to the water, what will be the vapor pressure of the resulting solution? 0.98 mm Hg 12 mm Hg 740 mm Hg 750 mm Hg 3 points QUESTION 6

What would be the freezing point of a 1.7 molal aqueous ethylene glycol (C2H6O2) solution? The freezing point depression constant for water = 1.86°C/m. 3.2°C –1.1°C 0.0°C –3.2°C 3 points QUESTION 7

What would be the boiling point of a 3.4 molal aqueous glucose (C6H12O6) solution? The boiling point elevation constant for water = 0.512°C/m. 1.7°C 6.64°C 98.3°C 101.7°C 3 points QUESTION 8

Which of the following properties of pure solvents decrease when a solute is added? boiling point vapor pressure freezing point volume

Aug 3rd, 2015

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colligative properties 2 The solution will have a lower vapor pressure than the pure solvent. 3 NaCl because it produces fewer moles of solute particles per mole of compound. 4 (1.50 mol) / (0.250 kg) = 6.00 mol/kg = 6.00 m 5 (300 g H2O) / (18.01532 g H2O/mol) = 16.652 mol H2O

(750 mmHg) x (16.652 mol / (16.652 mol + 0.27 mol)) = 740 mmHg 6 0.0°C 7 101.7°C 8 vapor pressure


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Aug 3rd, 2015

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