Question 1

The dissolution of ionic compounds in water depends only on the hydration energy of the ions.

Accepted Answer

A) 1 only 
B) 2 only 
C) 3 only 
D) 1 and 2 
E) 1,2,and 3 
A) 1 only 
B) 2 only 
C) 3 only 
D) 1 and 2 
E) 1,2,and 3

Question 2

What is the molality of a solution prepared by dissolving 0.114 mol of chloroform,CHCl3,in 476 g of toluene,C6H5CH3?

Accepted Answer

A) 0.0287 m 
B) 0.0216 m 
C) 0.239 m 
D) 0.0220 m 
E) 0.543 m 
A) 0.0287 m 
B) 0.0216 m 
C) 0.239 m 
D) 0.0220 m 
E) 0.543 m

Question 3

Which of the following is a correct statement of Henry's law?

Accepted Answer

A) The concentration of a gas in solution is directly proportional to the mole fraction of solvent. 
B) The concentration of a gas in solution is inversely proportional to temperature. 
C) The concentration of a gas in solution is independent of pressure. 
D) The concentration of a gas in a solution is inversely proportional to pressure. 
E) none of these 
A) The concentration of a gas in solution is directly proportional to the mole fraction of solvent. 
B) The concentration of a gas in solution is inversely proportional to temperature. 
C) The concentration of a gas in solution is independent of pressure. 
D) The concentration of a gas in a solution is inversely proportional to pressure. 
E) none of these

Question 4

In general,which of the following type(s)of solid(s)would exhibit the greatest solubility in a polar solvent?

Accepted Answer

A) network covalent 
B) ionic or polar molecular 
C) ionic 
D) metallic 
E) polar molecular 
A) network covalent 
B) ionic or polar molecular 
C) ionic 
D) metallic 
E) polar molecular

Question 5

The solubility of 1-pentanol in water is 2.7 g per 100 g of water at 25°C.What is the maximum amount of 1-pentanol that will dissolve in 4.1g of water at 25°C?

Accepted Answer

A) 0.11 g 
B) 0.65 g 
C) 2.7 g 
D) 11 g 
E) 0.0065 g 
A) 0.11 g 
B) 0.65 g 
C) 2.7 g 
D) 11 g 
E) 0.0065 g

Question 6

At 36°C,what is the osmotic pressure of a 0.82% NaCl by weight aqueous solution? Assume the density of the solution is 1.0 g/mL.(R = 0.0821 L · atm/(K · mol))

Accepted Answer

A) 0.35 atm 
B) 3.5 atm 
C) 4.1 × 102 atm 
D) 7.1 atm 
E) 0.82 atm 
A) 0.35 atm 
B) 3.5 atm 
C) 4.1 × 102 atm 
D) 7.1 atm 
E) 0.82 atm

Question 7

Which of the following gases is least soluble in water?

Accepted Answer

A) CO2 
B) SO3 
C) NH3 
D) N2 
E) HCl 
A) CO2 
B) SO3 
C) NH3 
D) N2 
E) HCl

Question 8

The molarity of a solution is defined as the

Accepted Answer

A) moles of solute per liter of solvent. 
B) grams of solute per kilogram of solvent. 
C) grams of solute per liter of solution. 
D) moles of solute per liter of solution. 
E) moles of solute per kilogram of solvent. 
A) moles of solute per liter of solvent. 
B) grams of solute per kilogram of solvent. 
C) grams of solute per liter of solution. 
D) moles of solute per liter of solution. 
E) moles of solute per kilogram of solvent.

Question 9

Trimellitic acid is an organic acid that has a composition of 51.44% C,2.88% H,and 45.68% O by mass.A 6.96-g sample of trimellitic acid dissolved in 30.00 g of acetone,CH3COCH3,has a boiling point of 58.09°C.What is the molecular formula of trimellitic acid? (Kb for acetone is 1.71°C/m,and pure acetone has a boiling point of 56.20°C.)

Accepted Answer

A) CH2O 
B) C9H6O6 
C) C3HO2 
D) C18HO16 
E) C6H2O4 
A) CH2O 
B) C9H6O6 
C) C3HO2 
D) C18HO16 
E) C6H2O4

Question 10

A suspension of sodium dodecanoate,CH3(CH2)10COONa,in water is most likely to form what type of colloid?

Accepted Answer

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

Question 11

What is the mole fraction of urea,CO(NH2)2,in a solution prepared by dissolving 4.0 g of urea in 32.0 g of methanol,CH3OH?

Accepted Answer

A) 0.89 
B) 0.11 
C) 0.063 
D) 0.94 
E) 0.19 
A) 0.89 
B) 0.11 
C) 0.063 
D) 0.94 
E) 0.19

Question 12

Which of the following will cause the calculated molar mass of a compound determined by the freezing-point-depression method to be greater than the true molar mass?

Accepted Answer

A) When the solute was added,some was spilled on the lab bench. 
B) Water gets into the solvent after the freezing point of the pure solvent is determined. 
C) Some of the solute molecules break apart. 
D) The mass of solvent is smaller than that determined from the weighing. 
E) all of the above 
A) When the solute was added,some was spilled on the lab bench. 
B) Water gets into the solvent after the freezing point of the pure solvent is determined. 
C) Some of the solute molecules break apart. 
D) The mass of solvent is smaller than that determined from the weighing. 
E) all of the above

Question 13

What is the boiling-point change for a solution containing 0.723 mol of naphthalene (a nonvolatile,nonionizing compound)in 250.g of liquid benzene? (Kb = 2.53°C/m for benzene)

Accepted Answer

A) 7.32 °C 
B) 3.50 °C 
C) 0.457 °C 
D) 0.87 °C 
E) 1.829 °C 
A) 7.32 °C 
B) 3.50 °C 
C) 0.457 °C 
D) 0.87 °C 
E) 1.829 °C

Question 14

Dental-filling alloy is a solution of _____.

Accepted Answer

A) ​liquid copper in solid brass 
B) ​liquid mercury in solid copper 
C) ​liquid copper in solid tungsten 
D) ​liquid sodium in solid potassium 
E) ​liquid mercury in solid silver 
A) ​liquid copper in solid brass 
B) ​liquid mercury in solid copper 
C) ​liquid copper in solid tungsten 
D) ​liquid sodium in solid potassium 
E) ​liquid mercury in solid silver

Question 15

Which of the following correctly states the relationship between the solubility of a substance in water and temperature?

Accepted Answer

A) The solubility of a substance in water increases as the temperature rises,especially for gases. 
B) The solubility of a substance in water decreases as the temperature lowers,especially for gases. 
C) The relationship between the solubility of a substance in water and temperature cannot be accurately predicted,especially for ionic solids. 
D) The solubility of a substance in water decreases as the temperature rises,especially for ionic solids. 
E) Two of these are correct. 
A) The solubility of a substance in water increases as the temperature rises,especially for gases. 
B) The solubility of a substance in water decreases as the temperature lowers,especially for gases. 
C) The relationship between the solubility of a substance in water and temperature cannot be accurately predicted,especially for ionic solids. 
D) The solubility of a substance in water decreases as the temperature rises,especially for ionic solids. 
E) Two of these are correct.

Question 16

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

Accepted Answer

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

Question 17

If a 23.6-g sample of a nonelectrolyte is dissolved in 136.0 g of water,the resulting solution will freeze at -0.85°C.What is the molar mass of the nonelectrolyte? (Kf for water is 1.858°C/m.)

Accepted Answer

A) 78 g/mol 
B) 0.38 g/mol 
C) 870 g/mol 
D) 270 g/mol 
E) 370 g/mol 
A) 78 g/mol 
B) 0.38 g/mol 
C) 870 g/mol 
D) 270 g/mol 
E) 370 g/mol

Question 18

The molality of a solution is defined as

Accepted Answer

A) moles of solute per liter of solution. 
B) the gram molecular weight of solute per kilogram of solvent. 
C) moles of solute per kilogram of solvent. 
D) grams of solute per liter of solution. 
E) moles of solute per kilogram of solution. 
A) moles of solute per liter of solution. 
B) the gram molecular weight of solute per kilogram of solvent. 
C) moles of solute per kilogram of solvent. 
D) grams of solute per liter of solution. 
E) moles of solute per kilogram of solution.

Question 19

Which of the following solutions has the lowest osmotic pressure?

Accepted Answer

A) 0.10 M Al(NO3)3 
B) 0.20 M NH3 
C) 0.15 M Ba(NO3)2 
D) 0.10 M CaBr2 
E) 0.15 M NaCl 
A) 0.10 M Al(NO3)3 
B) 0.20 M NH3 
C) 0.15 M Ba(NO3)2 
D) 0.10 M CaBr2 
E) 0.15 M NaCl

Exam 12: Solutions

The dissolution of ionic compounds in water depends only on the hydration energy of the ions.

What is the molality of a solution prepared by dissolving 0.114 mol of chloroform,CHCl3,in 476 g of toluene,C6H5CH3?

Which of the following is a correct statement of Henry's law?

In general,which of the following type(s)of solid(s)would exhibit the greatest solubility in a polar solvent?

The solubility of 1-pentanol in water is 2.7 g per 100 g of water at 25°C.What is the maximum amount of 1-pentanol that will dissolve in 4.1g of water at 25°C?

At 36°C,what is the osmotic pressure of a 0.82% NaCl by weight aqueous solution? Assume the density of the solution is 1.0 g/mL.(R = 0.0821 L · atm/(K · mol))

Which of the following gases is least soluble in water?

The molarity of a solution is defined as the

A suspension of sodium dodecanoate,CH3(CH2)10COONa,in water is most likely to form what type of colloid?

What is the mole fraction of urea,CO(NH2)2,in a solution prepared by dissolving 4.0 g of urea in 32.0 g of methanol,CH3OH?

Which of the following will cause the calculated molar mass of a compound determined by the freezing-point-depression method to be greater than the true molar mass?

What is the boiling-point change for a solution containing 0.723 mol of naphthalene (a nonvolatile,nonionizing compound)in 250.g of liquid benzene? (Kb = 2.53°C/m for benzene)

Dental-filling alloy is a solution of _____.

Which of the following correctly states the relationship between the solubility of a substance in water and temperature?

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

If a 23.6-g sample of a nonelectrolyte is dissolved in 136.0 g of water,the resulting solution will freeze at -0.85°C.What is the molar mass of the nonelectrolyte? (Kf for water is 1.858°C/m.)

The molality of a solution is defined as

Which of the following solutions has the lowest osmotic pressure?

Chemistry and Measurement

Atoms, molecules, and Ions

Calculations With Chemical Formulas and Equations

Chemical Reactions

The Gaseous State

Thermochemistry

Quantum Theory of the Atom

Electron Configurations and Periodicity

Ionic and Covalent Bonding

Molecular Geometry and Chemical Bonding Theory

States of Matter; Liquids and Solids

Rates of Reaction

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Thermodynamics and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry of the Main-Group Metals

The Transition Elements and Coordination Compounds

Organic Chemistry

Polymer Materials: Synthetic and Biological

Filters

What is the molality of a solution prepared by dissolving 0.114 mol of chloroform,CHCl₃,in 476 g of toluene,C₆H₅CH₃?

A suspension of sodium dodecanoate,CH₃(CH₂)₁₀COONa,in water is most likely to form what type of colloid?

What is the mole fraction of urea,CO(NH₂)₂,in a solution prepared by dissolving 4.0 g of urea in 32.0 g of methanol,CH₃OH?

What is the boiling-point change for a solution containing 0.723 mol of naphthalene (a nonvolatile,nonionizing compound)in 250.g of liquid benzene? (K_b = 2.53°C/m for benzene)

If a 23.6-g sample of a nonelectrolyte is dissolved in 136.0 g of water,the resulting solution will freeze at -0.85°C.What is the molar mass of the nonelectrolyte? (K_f for water is 1.858°C/m.)