Question 1

Which of the following amounts of solute,dissolved in 1.0 kg of water,creates a solution with the highest freezing temperature? (assuming ideal behavior)

Accepted Answer

A) 0.0015 mol of sucrose,C12H22O11 
B) 0.0015 mol of H2SO3 
C) 0.0030 mol of ethanol,C2H5OH 
D) 0.0030 mol of methanol,CH3OH 
E) 0.0015 mol of sulfuric acid,H2SO4 
A) 0.0015 mol of sucrose,C12H22O11 
B) 0.0015 mol of H2SO3 
C) 0.0030 mol of ethanol,C2H5OH 
D) 0.0030 mol of methanol,CH3OH 
E) 0.0015 mol of sulfuric acid,H2SO4

Question 2

What is the molality of a solution prepared by dissolving 9.01 g of urea,NH2CONH2,in 93.8 g of water?

Accepted Answer

A) 0.0876 m 
B) 0.096498 m 
C) 0.028985 m 
D) 1.59 m 
E) 0.00145 m 
A) 0.0876 m 
B) 0.096498 m 
C) 0.028985 m 
D) 1.59 m 
E) 0.00145 m

Question 3

What is the mass percent of an aqueous sodium hydroxide solution in which the mole fraction of NaOH is 0.1010? The density of the solution is 1.2219 g/mL.

Accepted Answer

A) 20.0% 
B) 12.0% 
C) 68.9% 
D) 12.3% 
E) 3.3% 
A) 20.0% 
B) 12.0% 
C) 68.9% 
D) 12.3% 
E) 3.3%

Question 4

A compound containing carbon and nitrogen has a composition of 46.16% carbon and 53.84% nitrogen by mass.A solution prepared by dissolving 3.912 g of this compound in 20.00 g of carbon tetrachloride,CCl4,produces a solution that boils at 95.63°C.What is the molecular formula of the compound? (Kb for CCl4 is 5.03°C/m,and pure CCl4 has a freezing point of 76.72°C.)

Accepted Answer

A) C2N2 
B) CN2 
C) C3N3 
D) CN 
E) C2N4 
A) C2N2 
B) CN2 
C) C3N3 
D) CN 
E) C2N4

Question 5

What type of colloid is formed when a gas is dispersed in a solid?

Accepted Answer

A) foam 
B) aerosol 
C) sol 
D) emulsion 
E) gel 
A) foam 
B) aerosol 
C) sol 
D) emulsion 
E) gel

Question 6

What is reverse osmosis?

Accepted Answer

A) the application,to a dilute solution,of a pressure that is greater than the osmotic pressure,such that solvent flows from the concentrated solution to the dilute solution 
B) the application,to a dilute solution,of a pressure that is greater than the osmotic pressure,such that solute flows from the concentrated solution to the dilute solution 
C) the application,to a concentrated solution,of a pressure that is greater than the osmotic pressure,such that solute flows from the concentrated solution to the dilute solution 
D) the application,to a concentrated solution,of a pressure that is greater than the osmotic pressure,such that solvent flows from the concentrated solution to the dilute solution 
E) the application,to a concentrated solution,of a pressure that is greater than the osmotic pressure,such that solvent flows from the dilute solution to the concentrated solution 
A) the application,to a dilute solution,of a pressure that is greater than the osmotic pressure,such that solvent flows from the concentrated solution to the dilute solution 
B) the application,to a dilute solution,of a pressure that is greater than the osmotic pressure,such that solute flows from the concentrated solution to the dilute solution 
C) the application,to a concentrated solution,of a pressure that is greater than the osmotic pressure,such that solute flows from the concentrated solution to the dilute solution 
D) the application,to a concentrated solution,of a pressure that is greater than the osmotic pressure,such that solvent flows from the concentrated solution to the dilute solution 
E) the application,to a concentrated solution,of a pressure that is greater than the osmotic pressure,such that solvent flows from the dilute solution to the concentrated solution

Question 7

Which of the following solutes,dissolved in 1000 g of water,would provide a solution with the lowest freezing point?

Accepted Answer

A) 0.030 mol of barium chloride,BaCl2 
B) 0.030 mol of urea,CO(NH2)2 
C) 0.030 mol of calcium sulfate,CaSO4 
D) 0.030 mol of acetic acid,CH3COOH 
E) 0.030 mol of ammonium nitrate,NH4NO3 
A) 0.030 mol of barium chloride,BaCl2 
B) 0.030 mol of urea,CO(NH2)2 
C) 0.030 mol of calcium sulfate,CaSO4 
D) 0.030 mol of acetic acid,CH3COOH 
E) 0.030 mol of ammonium nitrate,NH4NO3

Question 8

What is the mole fraction of toluene in a solution of 2.7 mol of benzene and 5.4 mol of toluene?

Accepted Answer

A) 0.70 
B) 0.54 
C) 0.67 
D) 0.24 
E) 0.33 
A) 0.70 
B) 0.54 
C) 0.67 
D) 0.24 
E) 0.33

Question 9

A 12.0% sucrose solution by mass has a density of 1.05 g/cm3.What mass of sucrose is present in a 29.0-mL sample of this solution?

Accepted Answer

A) 3.65 g 
B) 3.31 g 
C) 0.126 g 
D) 253 g 
E) 3.48 g 
A) 3.65 g 
B) 3.31 g 
C) 0.126 g 
D) 253 g 
E) 3.48 g

Question 10

What type of colloid is formed when a solid is dispersed in a liquid?

Accepted Answer

A) emulsion 
B) gel 
C) aerosol 
D) sol 
E) foam 
A) emulsion 
B) gel 
C) aerosol 
D) sol 
E) foam

Question 11

If 11.2 g of naphthalene,C10H8,is dissolved in 107.8 g of chloroform,CHCl3,what is the molality of the solution?

Accepted Answer

A) 0.0875 m 
B) 12.4 m 
C) 0.811 m 
D) 0.0941 m 
E) 0.0969 m 
A) 0.0875 m 
B) 12.4 m 
C) 0.811 m 
D) 0.0941 m 
E) 0.0969 m

Question 12

For a dilute solution of MgCl2,the van't Hoff factor (i)would be approximately

Accepted Answer

A) 3. 
B) 2. 
C) 4. 
D) 1. 
E) 5. 
A) 3. 
B) 2. 
C) 4. 
D) 1. 
E) 5.

Question 13

According to the National Institute of Standards webbook,the Henry's Law constant for N2 gas is 0.000639 mol/kg⋅bar at 25°C What is the Henry's law constant in units of mol/kg⋅atm? (1 bar = 0.9869 atm; 1 atm = 760 mmHg)

Accepted Answer

A)    × 10-4 mol/kg⋅atm 
B)    × 10-7 mol/kg⋅atm 
C)    × 10-1 mol/kg⋅atm 
D)    × 103 mol/kg⋅atm 
E)    × 106 mol/kg⋅atm 
A)    × 10-4 mol/kg⋅atm 
B)    × 10-7 mol/kg⋅atm 
C)    × 10-1 mol/kg⋅atm 
D)    × 103 mol/kg⋅atm 
E)    × 106 mol/kg⋅atm

Question 14

How many moles of urea (60.g/mol)must be dissolved in 66.6g of water to give a 2.4 m solution?

Accepted Answer

A) 1.4 × 102 mol 
B) 2.4 mol 
C) 0.0024 mol 
D) 0.15 mol 
E) 9.0 × 102 mol 
A) 1.4 × 102 mol 
B) 2.4 mol 
C) 0.0024 mol 
D) 0.15 mol 
E) 9.0 × 102 mol

Question 15

What mass of an aqueous 33.7% sodium chloride solution contains 88.1 g of water?

Accepted Answer

A) 132 g 
B) 44.7 g 
C) 11.9 g 
D) 29.6 g 
E) 88.1 g 
A) 132 g 
B) 44.7 g 
C) 11.9 g 
D) 29.6 g 
E) 88.1 g

Question 16

A suspension of silver particles in water is most likely to form what type of colloid?

Accepted Answer

A) aerosol 
B) micelle 
C) hydrophobic colloid 
D) association colloid 
E) hydrophilic colloid 
A) aerosol 
B) micelle 
C) hydrophobic colloid 
D) association colloid 
E) hydrophilic colloid

Question 17

At a particular temperature the solubility of O2 in water is 0.590 g/L at an oxygen pressure of around 15.2 atm.What is the Henry's law constant for O2 (in units of L · atm/mol)?

Accepted Answer

A) 3.88 × 10-2 
B) 8.24 × 102 
C) 2.80× 10-1 
D) 1.21× 10-3 
E) None of the above are within 5% of the correct answer. 
A) 3.88 × 10-2 
B) 8.24 × 102 
C) 2.80× 10-1 
D) 1.21× 10-3 
E) None of the above are within 5% of the correct answer.

Question 18

What is the freezing point of an aqueous 1.44 m CaCl2.0 solution? (Kf for water is 1.858°C/m.)

Accepted Answer

A) 8.0°C 
B) 2.7°C 
C) -8.0°C 
D) 0.0°C 
E) -2.7°C 
A) 8.0°C 
B) 2.7°C 
C) -8.0°C 
D) 0.0°C 
E) -2.7°C

Question 19

A concentrated acetic acid solution has a density of 1.05 g/mL at 25°C and is 17.4 M.What is the percent by mass of CH3COOH in the solution?

Accepted Answer

A) 99.5% CH3COOH by mass 
B) 1.7% CH3COOH by mass 
C) 0.6% CH3COOH by mass 
D) 2.8% CH3COOH by mass 
E) 57.1% CH3COOH by mass 
A) 99.5% CH3COOH by mass 
B) 1.7% CH3COOH by mass 
C) 0.6% CH3COOH by mass 
D) 2.8% CH3COOH by mass 
E) 57.1% CH3COOH by mass

Question 20

Which of the following statements describes the process of coagulation?

Accepted Answer

A) The dispersed phase of an association colloid aggregates and forms a hydrophilic colloid. 
B) The continuous phase of a colloid aggregates and separates from the dispersed phase. 
C) The dispersed phase of an association colloid aggregates and forms a hydrophobic colloid. 
D) The dispersed phase of a colloid aggregates and separates from the continuous phase. 
E) The dispersed phase of an association colloid aggregates and forms a micelle. 
A) The dispersed phase of an association colloid aggregates and forms a hydrophilic colloid. 
B) The continuous phase of a colloid aggregates and separates from the dispersed phase. 
C) The dispersed phase of an association colloid aggregates and forms a hydrophobic colloid. 
D) The dispersed phase of a colloid aggregates and separates from the continuous phase. 
E) The dispersed phase of an association colloid aggregates and forms a micelle.

Exam 12: Solutions

Which of the following amounts of solute,dissolved in 1.0 kg of water,creates a solution with the highest freezing temperature? (assuming ideal behavior)

What is the molality of a solution prepared by dissolving 9.01 g of urea,NH2CONH2,in 93.8 g of water?

What is the mass percent of an aqueous sodium hydroxide solution in which the mole fraction of NaOH is 0.1010? The density of the solution is 1.2219 g/mL.

What type of colloid is formed when a gas is dispersed in a solid?

What is reverse osmosis?

Which of the following solutes,dissolved in 1000 g of water,would provide a solution with the lowest freezing point?

What is the mole fraction of toluene in a solution of 2.7 mol of benzene and 5.4 mol of toluene?

A 12.0% sucrose solution by mass has a density of 1.05 g/cm3.What mass of sucrose is present in a 29.0-mL sample of this solution?

What type of colloid is formed when a solid is dispersed in a liquid?

If 11.2 g of naphthalene,C10H8,is dissolved in 107.8 g of chloroform,CHCl3,what is the molality of the solution?

For a dilute solution of MgCl2,the van't Hoff factor (i)would be approximately

According to the National Institute of Standards webbook,the Henry's Law constant for N2 gas is 0.000639 mol/kg⋅bar at 25°C What is the Henry's law constant in units of mol/kg⋅atm? (1 bar = 0.9869 atm; 1 atm = 760 mmHg)

How many moles of urea (60.g/mol)must be dissolved in 66.6g of water to give a 2.4 m solution?

What mass of an aqueous 33.7% sodium chloride solution contains 88.1 g of water?

A suspension of silver particles in water is most likely to form what type of colloid?

At a particular temperature the solubility of O2 in water is 0.590 g/L at an oxygen pressure of around 15.2 atm.What is the Henry's law constant for O2 (in units of L · atm/mol)?

What is the freezing point of an aqueous 1.44 m CaCl2.0 solution? (Kf for water is 1.858°C/m.)

A concentrated acetic acid solution has a density of 1.05 g/mL at 25°C and is 17.4 M.What is the percent by mass of CH3COOH in the solution?

Which of the following statements describes the process of coagulation?

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Filters

What is the molality of a solution prepared by dissolving 9.01 g of urea,NH₂CONH₂,in 93.8 g of water?

A 12.0% sucrose solution by mass has a density of 1.05 g/cm³.What mass of sucrose is present in a 29.0-mL sample of this solution?

If 11.2 g of naphthalene,C₁₀H₈,is dissolved in 107.8 g of chloroform,CHCl₃,what is the molality of the solution?

For a dilute solution of MgCl₂,the van't Hoff factor (i)would be approximately

According to the National Institute of Standards webbook,the Henry's Law constant for N₂ gas is 0.000639 mol/kg⋅bar at 25°C What is the Henry's law constant in units of mol/kg⋅atm? (1 bar = 0.9869 atm; 1 atm = 760 mmHg)

At a particular temperature the solubility of O₂ in water is 0.590 g/L at an oxygen pressure of around 15.2 atm.What is the Henry's law constant for O₂ (in units of L · atm/mol)?

What is the freezing point of an aqueous 1.44 m CaCl_2.0 solution? (K_f for water is 1.858°C/m.)

A concentrated acetic acid solution has a density of 1.05 g/mL at 25°C and is 17.4 M.What is the percent by mass of CH₃COOH in the solution?