Q: A student prepares a solution by dissolving 10 g of KBr (molar mass = 119 g/mol) in 100 g of water. What is the molality ($$m) of $$the solution?

$$m = \frac{10\,\text{g} / 119\,\text{g/mol}}{0.1\,\text{kg}} = 0.84\,\text{mol/kg}$$

Q: Which equation correctly represents the calculation of mole fraction of solvent ($$X_{\text{solvent}}) in a $$solution?

$$X_{\text{solvent}} = \frac{\text{mol}_{\text{solvent}}}{\text{mol}_{\text{solvent}} + \text{mol}_{\text{solute}}}$$

Q: A solution is prepared by dissolving 5 g of NaCl (molar mass = 58.44 g/mol) in enough water to make 250 mL of solution. What is the molarity ($$M) of $$the solution?

$$M = \frac{5\,\text{g} / 58.44\,\text{g/mol}}{0.25\,\text{L}} = 0.342\,\text{M}$$

Question 1

Which of the following compounds would be most soluble in water?

Accepted Answer

CH\_3CH\_2OH

Question 2

A solution contains 0.52 M solute at 340 K. If the solution is cooled to 290 K without precipitate forming, what is the new classification of the solution?

Accepted Answer

Supersaturated

Question 3

Which statement best describes the solubility of gases in water as temperature increases?

Accepted Answer

Solubility decreases

Question 4

Given the formula for molarity $$M = \frac{	ext{mol}_{	ext{solute}}}{L_{	ext{solution}}}$$, what is the molarity of a solution containing 0.25 mol NaCl in 500 mL of solution?

Accepted Answer

0.50 M

Question 5

Which of the following best explains why non-polar compounds dissolve in non-polar solvents?

Accepted Answer

Non-polar compounds have similar intermolecular forces to non-polar solvents

Question 6

Which of the following is true about the effect of pressure on the solubility of solids in liquids?

Accepted Answer

Pressure has no effect on solubility

Question 7

A student prepares a solution by dissolving 10 g of KBr (molar mass = 119 g/mol) in 100 g of water. What is the molality ($$m) of $$the solution?

Accepted Answer

$$m = \frac{10\,	ext{g} / 119\,	ext{g/mol}}{0.1\,	ext{kg}} = 0.84\,	ext{mol/kg}$$

Question 8

Which of the following best describes a saturated solution?

Accepted Answer

A solution at the maximum concentration of solute at a given temperature

Question 9

If a solid solute’s solubility increases with temperature, which graph best represents this relationship?

Accepted Answer

A graph with solubility increasing as temperature increases

Question 10

Which equation correctly represents the calculation of mole fraction of solvent ($$X_{	ext{solvent}}) in a $$solution?

Accepted Answer

$$X_{	ext{solvent}} = \frac{	ext{mol}_{	ext{solvent}}}{	ext{mol}_{	ext{solvent}} + 	ext{mol}_{	ext{solute}}}$$

Question 11

A solution is at equilibrium. What does this mean in terms of the rates of dissolution and precipitation?

Accepted Answer

The rates of dissolution and precipitation are equal

Question 12

Which of the following would increase the solubility of a gas in water?

Accepted Answer

Increasing the pressure

Question 13

A solution is prepared by dissolving 5 g of NaCl (molar mass = 58.44 g/mol) in enough water to make 250 mL of solution. What is the molarity ($$M) of $$the solution?

Accepted Answer

$$M = \frac{5\,	ext{g} / 58.44\,	ext{g/mol}}{0.25\,	ext{L}} = 0.342\,	ext{M}$$

Question 14

Which of the following is a correct statement about the solubility of solids and gases in water?

Accepted Answer

Solubility of solids usually increases with increasing temperature

Question 15

A solution contains 0.125 mol KBr in 1.00 kg of solvent. What is the molality ($$m) of $$the solution?

Accepted Answer

$$m = 0.125\,	ext{mol/kg}$$

Question 16

Which of the following best describes the phrase 'like dissolves like'?

Accepted Answer

Polar solvents dissolve polar solutes

Question 17

A solution is prepared by mixing 20 g of glucose (C\_6H\_12O\_6, molar mass = 180 g/mol) in 200 mL of water (density = 1.00 g/mL). What is the mole fraction of glucose in the solution?

Accepted Answer

$$X_{	ext{glucose}} = \frac{20/180}{(200/18) + (20/180)}$$

Question 18

Which of the following is NOT a unit of concentration?

Accepted Answer

Density

Question 19

If a solution is unsaturated, what will happen if more solute is added?

Accepted Answer

The solute will dissolve until the solution becomes saturated

CH 11

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