Question 1

Identify the classification of milk.

Accepted Answer

A) aerosol 
B) solid aerosol 
C) foam 
D) emulsion 
E) solid emulsion 
A) aerosol 
B) solid aerosol 
C) foam 
D) emulsion 
E) solid emulsion

Question 2

A compound is found to have a molar mass of 598 g mol-1.If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25 °C,what is the osmotic pressure of the resulting solution?

Accepted Answer

A) 3.42 × 10-3 bar 
B) 8.48 × 10-3 bar 
C) 5.01 × 10-3 bar 
D) 5.99 × 10-3 bar 
E) 8.06 × 10-3 bar 
A) 3.42 × 10-3 bar 
B) 8.48 × 10-3 bar 
C) 5.01 × 10-3 bar 
D) 5.99 × 10-3 bar 
E) 8.06 × 10-3 bar

Question 3

A compound is found to have a molar mass of 190 g mol-1.If 0.0673 g of the compound is dissolved in enough water to make 200 mL of solution at 25 °C,what is the osmotic pressure of the resulting solution?

Accepted Answer

A) 1.21 × 10-2 bar 
B) 6.12 × 10-2 bar 
C) 4.39 × 10-2 bar 
D) 3.97 × 10-2 bar 
E) 2.28 × 10-2 bar 
A) 1.21 × 10-2 bar 
B) 6.12 × 10-2 bar 
C) 4.39 × 10-2 bar 
D) 3.97 × 10-2 bar 
E) 2.28 × 10-2 bar

Question 4

A 150.0 mL sample of an aqueous solution at 25 °C contains 15.2 mg of an unknown nonelectrolyte compound.If the solution has an osmotic pressure of 8.44 Torr,what is the molar mass of the unknown compound?

Accepted Answer

A) 223 g mol-1 
B) 294 g mol-1 
C) 341 g mol-1 
D) 448 g mol-1 
E) 195 g mol-1 
A) 223 g mol-1 
B) 294 g mol-1 
C) 341 g mol-1 
D) 448 g mol-1 
E) 195 g mol-1

Question 5

An aqueous solution is 0.387 mol L-1 in HCl.What is the molality of the solution if the density is 1.23 g mL-1?

Accepted Answer

A) 0.115 mol kg-1 
B) 0.387 mol kg-1 
C) 0.315 mol kg-1 
D) 0.411 mol kg-1 
E) 0.318 mol kg-1 
A) 0.115 mol kg-1 
B) 0.387 mol kg-1 
C) 0.315 mol kg-1 
D) 0.411 mol kg-1 
E) 0.318 mol kg-1

Question 6

A solution of LiCl in water is 20.0 wt% LiCl.What is the mole fraction of LiCl? Assume the density of the solution is 1.00 g mL-1.

Accepted Answer

A) 0.0960 
B) 0.106 
C) 0.472 
D) 4.44 
A) 0.0960 
B) 0.106 
C) 0.472 
D) 4.44

Question 7

Choose the aqueous solution with the highest vapour pressure.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Accepted Answer

A) 0.50 mol kg-1 C3H8O3 
B) 0.50 mol kg-1 C2H6O2 
C) 0.50 mol kg-1 C6H12O6 
D) 0.50 mol kg-1 C12H22O11 
E) They all have about the same vapour pressure. 
A) 0.50 mol kg-1 C3H8O3 
B) 0.50 mol kg-1 C2H6O2 
C) 0.50 mol kg-1 C6H12O6 
D) 0.50 mol kg-1 C12H22O11 
E) They all have about the same vapour pressure.

Question 8

Choose the situation below that would result in an exothermic ?solutionH.

Accepted Answer

A) when $|\Delta _ { \text {solute } } H \mid$ >$|\Delta \text { hydration } H \mid$ 
B) when $|\Delta _ { \text {solute } } H \mid$ is close to$|\Delta \text { hydration } H \mid$ 
C) when $|\Delta _ { \text {solute } } H \mid$ $|\Delta _ { \text {solute } } H \mid$ 
E) There isn't enough information to determine the answer. 
A) when $|\Delta _ { \text {solute } } H \mid$ >$|\Delta \text { hydration } H \mid$ 
B) when $|\Delta _ { \text {solute } } H \mid$ is close to$|\Delta \text { hydration } H \mid$ 
C) when $|\Delta _ { \text {solute } } H \mid$ $|\Delta _ { \text {solute } } H \mid$ 
E) There isn't enough information to determine the answer.

Question 9

Identify the solute with the lowest van't Hoff factor.

Accepted Answer

A) nonelectrolyte 
B) NaCl 
C) MgSO4 
D) MgCl2 
E) FeCl3 
A) nonelectrolyte 
B) NaCl 
C) MgSO4 
D) MgCl2 
E) FeCl3

Question 10

Calculate the vapour pressure of pure water at 85 °C if a 285 mL solution containing 173.0 g of mannose,C6H12O6,has a vapour pressure of 545.0 mbar.

Accepted Answer

A) 531 mbar 
B) 578 mbar 
C) 508 mbar 
D) 599 mbar 
E) 520 mbar 
A) 531 mbar 
B) 578 mbar 
C) 508 mbar 
D) 599 mbar 
E) 520 mbar

Question 11

Identify the compound whose solubility is least affected by temperature.

Accepted Answer

A) Na2SO4 
B) K2Cr2O7 
C) KNO3 
D) KClO3 
E) NaCl 
A) Na2SO4 
B) K2Cr2O7 
C) KNO3 
D) KClO3 
E) NaCl

Question 12

Identify the classification of whipped cream.

Accepted Answer

A) aerosol 
B) solid aerosol 
C) foam 
D) emulsion 
E) solid emulsion 
A) aerosol 
B) solid aerosol 
C) foam 
D) emulsion 
E) solid emulsion

Question 13

Which of the following statements is TRUE?

Accepted Answer

A) The solubility of a gas is not dependent on either temperature or pressure. 
B) The solubility of a gas is highly dependent on pressure. 
C) The solubility of a gas is highly dependent on both pressure and temperature. 
D) The solubility of a gas is highly dependent on temperature. 
E) None of the above. 
A) The solubility of a gas is not dependent on either temperature or pressure. 
B) The solubility of a gas is highly dependent on pressure. 
C) The solubility of a gas is highly dependent on both pressure and temperature. 
D) The solubility of a gas is highly dependent on temperature. 
E) None of the above.

Question 14

Calculate the mass of oxygen (in mg)dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 bar of air.Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law constant for oxygen in water at this temperature to be 1.3 × 10-3 mol L-1 bar-1.

Accepted Answer

A) 49.4 mg 
B) 23.5 mg 
C) 9.87 mg 
D) 27.3 mg 
E) 13.7 mg 
A) 49.4 mg 
B) 23.5 mg 
C) 9.87 mg 
D) 27.3 mg 
E) 13.7 mg

Question 15

Choose the aqueous solution that has the highest boiling point.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Accepted Answer

A) 0.100 mol kg-1 AlCl3 
B) 0.100 mol kg-1 NaCl 
C) 0.100 mol kg-1 MgCl2 
D) 0.100 mol kg-1 C6H12O6 
E) They all have the same boiling point. 
A) 0.100 mol kg-1 AlCl3 
B) 0.100 mol kg-1 NaCl 
C) 0.100 mol kg-1 MgCl2 
D) 0.100 mol kg-1 C6H12O6 
E) They all have the same boiling point.

Question 16

Which of the following statements is TRUE?

Accepted Answer

A) In general,the solubility of a solid in water decreases with increasing temperature. 
B) In general,the solubility of a gas in water decreases with increasing temperature. 
C) The solubility of a gas in water usually increases with decreasing pressure. 
D) The solubility of an ionic solid in water decreases with increasing temperature. 
E) None of the above statements is true. 
A) In general,the solubility of a solid in water decreases with increasing temperature. 
B) In general,the solubility of a gas in water decreases with increasing temperature. 
C) The solubility of a gas in water usually increases with decreasing pressure. 
D) The solubility of an ionic solid in water decreases with increasing temperature. 
E) None of the above statements is true.

Question 17

Calculate the total solution volume required to produce an osmotic pressure of 4.87 mbar using 8.21 mg of a protein with a molar mass of 4450 g mol-1 at 25.0 °C.

Accepted Answer

A) 10.6 mL 
B) 4.79 mL 
C) 12.3 mL 
D) 9.39 mL 
E) 8.00 mL 
A) 10.6 mL 
B) 4.79 mL 
C) 12.3 mL 
D) 9.39 mL 
E) 8.00 mL

Question 18

How much water must be added to 40.0 g of CaCl2 to produce a solution that is 35.0 wt% CaCl2?

Accepted Answer

A) 54.0 g 
B) 74.2 g 
C) 87.5 g 
D) 114 g 
A) 54.0 g 
B) 74.2 g 
C) 87.5 g 
D) 114 g

Question 19

Define a colloid.

Accepted Answer

A colloid is a mixtu

Question 20

Explain why the van't Hoff factor for MgCl2 is less than its predicted value.

Accepted Answer

The hydrated Mg²⁺ and Cl^- ions ca

Exam 12: Solutions

Identify the classification of milk.

A compound is found to have a molar mass of 598 g mol-1.If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25 °C,what is the osmotic pressure of the resulting solution?

A compound is found to have a molar mass of 190 g mol-1.If 0.0673 g of the compound is dissolved in enough water to make 200 mL of solution at 25 °C,what is the osmotic pressure of the resulting solution?

A 150.0 mL sample of an aqueous solution at 25 °C contains 15.2 mg of an unknown nonelectrolyte compound.If the solution has an osmotic pressure of 8.44 Torr,what is the molar mass of the unknown compound?

An aqueous solution is 0.387 mol L-1 in HCl.What is the molality of the solution if the density is 1.23 g mL-1?

A solution of LiCl in water is 20.0 wt% LiCl.What is the mole fraction of LiCl? Assume the density of the solution is 1.00 g mL-1.

Choose the aqueous solution with the highest vapour pressure.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Choose the situation below that would result in an exothermic ?solutionH.

Identify the solute with the lowest van't Hoff factor.

Calculate the vapour pressure of pure water at 85 °C if a 285 mL solution containing 173.0 g of mannose,C6H12O6,has a vapour pressure of 545.0 mbar.

Identify the compound whose solubility is least affected by temperature.

Identify the classification of whipped cream.

Which of the following statements is TRUE?

Calculate the mass of oxygen (in mg)dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 bar of air.Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law constant for oxygen in water at this temperature to be 1.3 × 10-3 mol L-1 bar-1.

Choose the aqueous solution that has the highest boiling point.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Which of the following statements is TRUE?

Calculate the total solution volume required to produce an osmotic pressure of 4.87 mbar using 8.21 mg of a protein with a molar mass of 4450 g mol-1 at 25.0 °C.

How much water must be added to 40.0 g of CaCl2 to produce a solution that is 35.0 wt% CaCl2?

Define a colloid.

Explain why the van't Hoff factor for MgCl2 is less than its predicted value.

Units of Measurement for Physical and Chemical Change

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Chemical Reactions and Stoichiometry

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Filters

A compound is found to have a molar mass of 598 g mol^-1.If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25 °C,what is the osmotic pressure of the resulting solution?

A compound is found to have a molar mass of 190 g mol^-1.If 0.0673 g of the compound is dissolved in enough water to make 200 mL of solution at 25 °C,what is the osmotic pressure of the resulting solution?

An aqueous solution is 0.387 mol L^-1 in HCl.What is the molality of the solution if the density is 1.23 g mL^-1?

A solution of LiCl in water is 20.0 wt% LiCl.What is the mole fraction of LiCl? Assume the density of the solution is 1.00 g mL^-1.

Choose the situation below that would result in an exothermic ?_solutionH.

Calculate the vapour pressure of pure water at 85 °C if a 285 mL solution containing 173.0 g of mannose,C₆H₁₂O₆,has a vapour pressure of 545.0 mbar.

Calculate the mass of oxygen (in mg)dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 bar of air.Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law constant for oxygen in water at this temperature to be 1.3 × 10^-3 mol L^-1 bar^-1.

Calculate the total solution volume required to produce an osmotic pressure of 4.87 mbar using 8.21 mg of a protein with a molar mass of 4450 g mol^-1 at 25.0 °C.

How much water must be added to 40.0 g of CaCl₂ to produce a solution that is 35.0 wt% CaCl₂?

Explain why the van't Hoff factor for MgCl₂ is less than its predicted value.