Question 1

Calcium nitrite is used as a corrosion inhibitor in lubricants. What is the molality of a solution prepared by dissolving 18.5 g of calcium nitrite in 83.5 g of distilled water?

Accepted Answer

A) 0.0342 m 
B) 0.0855 m 
C) 0.222 m 
D) 0.444 m 
E) 1.68 m

Question 2

Select the type of interaction that best describes the attraction between Mg2+ ions and water molecules.

Accepted Answer

A) dipole-dipole 
B) dipole-induced dipole 
C) ion-dipole 
D) ion-induced dipole 
E) ion-hydrogen bond

Question 3

Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane (ℳ = 86.18 g/mol) at 49.6°C. P°hexane = 400.0 torr at 49.6°C.

Accepted Answer

A) 54 torr 
B) 154 torr 
C) 246 torr 
D) 346 torr 
E) 400. torr

Question 4

Which of the following statements describes the correct method of preparation of 1.00 L of a 2.0 M urea solution? ℳurea = 60.06 g/mol

Accepted Answer

A) Dissolve 120 g of urea in 1.00 kg of distilled water. 
B) Dissolve 120 g of urea in 880 g of distilled water. 
C) Dissolve 120 g of urea in enough distilled water to produce 1.00 L of solution. 
D) Dissolve 120 g of urea in 1.00 liter of distilled water. 
E) The density of urea is needed in order to do this calculation.

Question 5

A saturated solution of carbon dioxide in water contains 3.00 g of CO2 when the CO2 partial pressure is 8.0 atm. What mass of CO2 will escape if the partial pressure is lowered to 3.2 atm?

Accepted Answer

A) 0.90 g 
B) 1.20 g 
C) 1.40 g 
D) 1.80 g 
E) 2.20 g

Question 6

What is the mole fraction of Ne in a mixture containing 10.1 g of Ne, 79.9 g of Ar, and 83.8 g of Kr?

Accepted Answer

A) 0.40 
B) 0.25 
C) 0.20 
D) 0.14 
E) 0.058

Question 7

Which of the following pairs of ions is arranged so that the ion with the larger (i.e., more negative) heat of hydration is listed first?

Accepted Answer

A) Br −, K + 
B) Mg 2+, Sr 2+ 
C) Ca 2+, Sc 3+ 
D) Na +, Li + 
E) None of these choices are correct.

Question 8

When two pure substances are mixed to form a solution

Accepted Answer

A) heat is released. 
B) heat is absorbed. 
C) there is an increase in entropy. 
D) there is a decrease in entropy. 
E) entropy is conserved.

Question 9

The chemist, Anna Lytic, must prepare 1.00 kg of 15.0% (w/w) acetic acid using a stock solution which is 36.0% (w/w) acetic acid (d = 1.045 g/mL). Which of the following combinations will give her the solution she wants?

Accepted Answer

A) 417 mL of 36% acetic acid in 583 mL of distilled water 
B) 417 g of 36% acetic acid in 583 g of distilled water 
C) 360 mL of 36% acetic acid in 640 mL of distilled water 
D) 360 g of 36% acetic acid in 640 g of distilled water 
E) 150 g of 36% acetic acid in 850 g of distilled water

Question 10

Which of the following aqueous solutions should demonstrate the most ideal behavior?

Accepted Answer

A) 0.1 M K 2SO 4 
B) 0.1 M CaCl 2 
C) 3.0 M LiF 
D) 0.1 M MgSO 4 
E) 0.1 M NaCl

Question 11

How many moles of solute particles are present in 100.0 mL of 2.50 M (NH4)3PO4?

Accepted Answer

A) 0.100 mol 
B) 0.250 mol 
C) 0.500 mol 
D) 0.750 mol 
E) 1.00 mol

Question 12

Potassium hydrogen phosphate is used in the preparation of nondairy powdered creamers. Calculate the molarity of a solution prepared by dissolving 238 g of K2HPO4 in enough water to produce 275 mL of solution.

Accepted Answer

A) 0.732 M 
B) 0.865 M 
C) 2.66 M 
D) 4.97 M 
E) None of these choices are correct.

Question 13

Lysine is an amino acid that is an essential part of nutrition but which is not synthesized by the human body. What is the molar mass of lysine if 750.0 mL of a solution containing 8.60 g of lysine has an osmotic pressure of 1.918 atm? Temperature = 25.0°C

Accepted Answer

A) 110. g/mol 
B) 146 g/mol 
C) 220. g/mol 
D) 1340 g/mol 
E) 1780 g/mol

Question 14

Cinnamaldehyde (ℳ = 132.15 g/mol) is used as a flavoring agent. What mass of cinnamaldehyde must be added to 175 g of ethanol to give a solution whose boiling point is 82.7°C? Kb = 1.22°C/m, boiling point of pure ethanol = 78.5°C

Accepted Answer

A) 62.4 g 
B) 67.8 g 
C) 76.2 g 
D) 78.5 g 
E) 79.6 g

Question 15

All solutions are mixtures

Accepted Answer

A) True 
 B)False

Question 16

Which one of the following pairs of dispersed phases and dispersing media can never form a colloid?

Accepted Answer

A) Solid and Gas 
B) Liquid and Gas 
C) Solid and Solid 
D) Liquid and Liquid 
E) Gas and Gas

Exam 13: The Properties of Mixtures: Solutions and Colloids

Calcium nitrite is used as a corrosion inhibitor in lubricants. What is the molality of a solution prepared by dissolving 18.5 g of calcium nitrite in 83.5 g of distilled water?

Select the type of interaction that best describes the attraction between Mg²⁺ ions and water molecules.

Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane (ℳ = 86.18 g/mol) at 49.6°C. P°_hexane = 400.0 torr at 49.6°C.

Which of the following statements describes the correct method of preparation of 1.00 L of a 2.0 M urea solution? ℳ_urea= 60.06 g/mol

A saturated solution of carbon dioxide in water contains 3.00 g of CO₂ when the CO₂ partial pressure is 8.0 atm. What mass of CO₂ will escape if the partial pressure is lowered to 3.2 atm?

What is the mole fraction of Ne in a mixture containing 10.1 g of Ne, 79.9 g of Ar, and 83.8 g of Kr?

Which of the following pairs of ions is arranged so that the ion with the larger (i.e., more negative) heat of hydration is listed first?

When two pure substances are mixed to form a solution

The chemist, Anna Lytic, must prepare 1.00 kg of 15.0% (w/w) acetic acid using a stock solution which is 36.0% (w/w) acetic acid (d = 1.045 g/mL) . Which of the following combinations will give her the solution she wants?

Which of the following aqueous solutions should demonstrate the most ideal behavior?

How many moles of solute particles are present in 100.0 mL of 2.50 M (NH₄) ₃PO₄?

Potassium hydrogen phosphate is used in the preparation of nondairy powdered creamers. Calculate the molarity of a solution prepared by dissolving 238 g of K₂HPO₄ in enough water to produce 275 mL of solution.

Lysine is an amino acid that is an essential part of nutrition but which is not synthesized by the human body. What is the molar mass of lysine if 750.0 mL of a solution containing 8.60 g of lysine has an osmotic pressure of 1.918 atm? Temperature = 25.0°C

Cinnamaldehyde (ℳ = 132.15 g/mol) is used as a flavoring agent. What mass of cinnamaldehyde must be added to 175 g of ethanol to give a solution whose boiling point is 82.7°C? K_b = 1.22°C/m, boiling point of pure ethanol = 78.5°C

All solutions are mixtures

Which one of the following pairs of dispersed phases and dispersing media can never form a colloid?

Exam 13: The Properties of Mixtures: Solutions and Colloids

Calcium nitrite is used as a corrosion inhibitor in lubricants. What is the molality of a solution prepared by dissolving 18.5 g of calcium nitrite in 83.5 g of distilled water?

Select the type of interaction that best describes the attraction between Mg2+ ions and water molecules.

Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane (ℳ = 86.18 g/mol) at 49.6°C. P°hexane = 400.0 torr at 49.6°C.

Which of the following statements describes the correct method of preparation of 1.00 L of a 2.0 M urea solution? ℳurea = 60.06 g/mol

A saturated solution of carbon dioxide in water contains 3.00 g of CO2 when the CO2 partial pressure is 8.0 atm. What mass of CO2 will escape if the partial pressure is lowered to 3.2 atm?

What is the mole fraction of Ne in a mixture containing 10.1 g of Ne, 79.9 g of Ar, and 83.8 g of Kr?

Which of the following pairs of ions is arranged so that the ion with the larger (i.e., more negative) heat of hydration is listed first?

When two pure substances are mixed to form a solution

The chemist, Anna Lytic, must prepare 1.00 kg of 15.0% (w/w) acetic acid using a stock solution which is 36.0% (w/w) acetic acid (d = 1.045 g/mL) . Which of the following combinations will give her the solution she wants?

Which of the following aqueous solutions should demonstrate the most ideal behavior?

How many moles of solute particles are present in 100.0 mL of 2.50 M (NH4) 3PO4?

Potassium hydrogen phosphate is used in the preparation of nondairy powdered creamers. Calculate the molarity of a solution prepared by dissolving 238 g of K2HPO4 in enough water to produce 275 mL of solution.

Lysine is an amino acid that is an essential part of nutrition but which is not synthesized by the human body. What is the molar mass of lysine if 750.0 mL of a solution containing 8.60 g of lysine has an osmotic pressure of 1.918 atm? Temperature = 25.0°C

Cinnamaldehyde (ℳ = 132.15 g/mol) is used as a flavoring agent. What mass of cinnamaldehyde must be added to 175 g of ethanol to give a solution whose boiling point is 82.7°C? Kb = 1.22°C/m, boiling point of pure ethanol = 78.5°C

All solutions are mixtures

Which one of the following pairs of dispersed phases and dispersing media can never form a colloid?

Select the type of interaction that best describes the attraction between Mg²⁺ ions and water molecules.

Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane (ℳ = 86.18 g/mol) at 49.6°C. P°_hexane = 400.0 torr at 49.6°C.

Which of the following statements describes the correct method of preparation of 1.00 L of a 2.0 M urea solution? ℳ_urea= 60.06 g/mol

A saturated solution of carbon dioxide in water contains 3.00 g of CO₂ when the CO₂ partial pressure is 8.0 atm. What mass of CO₂ will escape if the partial pressure is lowered to 3.2 atm?

How many moles of solute particles are present in 100.0 mL of 2.50 M (NH₄) ₃PO₄?

Potassium hydrogen phosphate is used in the preparation of nondairy powdered creamers. Calculate the molarity of a solution prepared by dissolving 238 g of K₂HPO₄ in enough water to produce 275 mL of solution.

Cinnamaldehyde (ℳ = 132.15 g/mol) is used as a flavoring agent. What mass of cinnamaldehyde must be added to 175 g of ethanol to give a solution whose boiling point is 82.7°C? K_b = 1.22°C/m, boiling point of pure ethanol = 78.5°C