Question 1

Which statement below regarding the liquid-gas phase transition and boiling is NOT correct?

Accepted Answer

A) More molecules have sufficient energy to escape the liquid phase at higher temperatures. 
B) The vapor pressure of a liquid increases with temperature. 
C) Boiling occurs only when the vapor pressure of a liquid equals 1 standard atm. 
D) More volatile liquids have lower boiling points. 
E) Liquids with stronger intermolecular forces typically have higher boiling points. 
A) More molecules have sufficient energy to escape the liquid phase at higher temperatures. 
B) The vapor pressure of a liquid increases with temperature. 
C) Boiling occurs only when the vapor pressure of a liquid equals 1 standard atm. 
D) More volatile liquids have lower boiling points. 
E) Liquids with stronger intermolecular forces typically have higher boiling points.

Question 2

At 25 $\degree$C, the vapor pressure of pure water is 25.756 mmHg.Starting with 250.0 g of water and solid glucose (C6H12O6, 180.16 g/mol), you must create an aqueous solution that has a vapor pressure reduction of 2.000 mmHg.How many grams of glucose do you need?

Accepted Answer

A) 1.17 g 
B) 14.1 g 
C) 19.5 g 
D) 166 g 
E) 211 g 
A) 1.17 g 
B) 14.1 g 
C) 19.5 g 
D) 166 g 
E) 211 g

Question 3

The vapor pressure of benzene (C6H6, 78.12 g/mol) at 25 $\degree$C is 0.1252 atm.What is the change in the vapor pressure when 10.00 g of naphthalene (C10H8, 128.2 g/mol) is dissolved in 0.2000 kg of C6H6?

Accepted Answer

A) (-9704 atm) 
B) (-0.0296 atm) 
C) (-0.0036 atm) 
D) (-0.1215 atm) 
E) (-0.9704 atm). 
A) (-9704 atm) 
B) (-0.0296 atm) 
C) (-0.0036 atm) 
D) (-0.1215 atm) 
E) (-0.9704 atm).

Question 4

The freezing point of a 0.0925 m solution of ammonium chloride was found to be -0.325 $\degree$C.What is the actual van 't Hoff factor for this salt at this concentration? (Kf (water) =1.86 $\degree$C/m)

Accepted Answer

A) 1.89 
B) 1.95 
C) 1.86 
D) 1.80 
E) 1.97 
A) 1.89 
B) 1.95 
C) 1.86 
D) 1.80 
E) 1.97

Question 5

What is the boiling point elevation constant of ethanol if a solution prepared by dissolving 56.00 g of glycerin (C3H8O3, 92.11 g/mol) in 240.0 g of ethanol (C2H6O, 46.08 g/mol) has a boiling point change of 3.014 $\degree$C?

Accepted Answer

A) 1.029 $\degree$C/m 
B) 0.6080 $\degree$C/m 
C) 1.190 $\degree$C/m 
D) 0.8405 $\degree$C/m 
E) 0.4398 $\degree$C/m 
A) 1.029 $\degree$C/m 
B) 0.6080 $\degree$C/m 
C) 1.190 $\degree$C/m 
D) 0.8405 $\degree$C/m 
E) 0.4398 $\degree$C/m

Question 6

You have learned that adding table salt, NaCl (58.44 g/mol, 2.16 g/cm3), to water (Kb = 0.52 $\degree$C/m) increases the temperature at which it boils.You decide to try cooking pasta faster at a higher temperature in boiling salty water.What increase in the boiling point do you expect if you add 1 tablespoon (1 tbsp = 14.8 cm3) of salt to one 8 oz cup of water (237 mL)?

Accepted Answer

A) 1.0 $\degree$C 
B) 2.4 $\degree$C 
C) 28 $\degree$C 
D) 1.5 $\degree$C 
E) 3.7 $\degree$C 
A) 1.0 $\degree$C 
B) 2.4 $\degree$C 
C) 28 $\degree$C 
D) 1.5 $\degree$C 
E) 3.7 $\degree$C

Question 7

Which statement below regarding evaporation and condensation of a liquid in a closed container is NOT correct?

Accepted Answer

A) When a liquid is first placed in a closed container, the evaporation rate is higher than it is in an open container under the same conditions. 
B) When a liquid is first placed in a closed container, the evaporation rate is higher than the condensation rate. 
C) When the rates of evaporation and condensation are equal, the system has reached dynamic equilibrium. 
D) Vapor pressure refers to the pressure of a gas at a given temperature in equilibrium with its liquid phase. 
E) Stronger intermolecular forces within the liquid typically result in a lower vapor pressure under a given set of conditions. 
A) When a liquid is first placed in a closed container, the evaporation rate is higher than it is in an open container under the same conditions. 
B) When a liquid is first placed in a closed container, the evaporation rate is higher than the condensation rate. 
C) When the rates of evaporation and condensation are equal, the system has reached dynamic equilibrium. 
D) Vapor pressure refers to the pressure of a gas at a given temperature in equilibrium with its liquid phase. 
E) Stronger intermolecular forces within the liquid typically result in a lower vapor pressure under a given set of conditions.

Question 8

A solution is prepared by mixing 45.68 g of carbon disulfide (CS2, 76.13 g/mol) with 16.42 g of acetonitrile (CH3CN, 41.06 g/mol).What is the partial pressure of CS2 in the vapor phase at 25 $\degree$C?

Accepted Answer

A) 3.57 *102 torr 
B) 2.50 * 102 torr 
C) 2.14 * 102 torr 
D) 1.97 * 102 torr 
E) 8.95 * 101 torr 
A) 3.57 *102 torr 
B) 2.50 * 102 torr 
C) 2.14 * 102 torr 
D) 1.97 * 102 torr 
E) 8.95 * 101 torr

Question 9

What information is provided by the van 't Hoff factor?

Accepted Answer

The van 't Hoff factor gives t

Question 10

What is the osmotic pressure of a 0.300 M blood plasma sample at 37.0 $\degree$C? Assume a van't Hoff factor of 1.

Accepted Answer

A) 1.34 atm 
B) 9.23 atm 
C) 7.34 atm 
D) 14.8 atm 
E) 7.64 atm 
A) 1.34 atm 
B) 9.23 atm 
C) 7.34 atm 
D) 14.8 atm 
E) 7.64 atm

Which statement below regarding the liquid-gas phase transition and boiling is NOT correct?

At 25 $\degree$ C, the vapor pressure of pure water is 25.756 mmHg.Starting with 250.0 g of water and solid glucose (C₆H₁₂O₆, 180.16 g/mol), you must create an aqueous solution that has a vapor pressure reduction of 2.000 mmHg.How many grams of glucose do you need?

The vapor pressure of benzene (C₆H₆, 78.12 g/mol) at 25 $\degree$ C is 0.1252 atm.What is the change in the vapor pressure when 10.00 g of naphthalene (C₁₀H₈, 128.2 g/mol) is dissolved in 0.2000 kg of C₆H₆?

The freezing point of a 0.0925 m solution of ammonium chloride was found to be -0.325 $\degree$ C.What is the actual van 't Hoff factor for this salt at this concentration? (K_f (water) =1.86 $\degree$ C/m)

What is the boiling point elevation constant of ethanol if a solution prepared by dissolving 56.00 g of glycerin (C₃H₈O₃, 92.11 g/mol) in 240.0 g of ethanol (C₂H₆O, 46.08 g/mol) has a boiling point change of 3.014 $\degree$ C?

Which statement below regarding evaporation and condensation of a liquid in a closed container is NOT correct?

What information is provided by the van 't Hoff factor?

What is the osmotic pressure of a 0.300 M blood plasma sample at 37.0 $\degree$ C? Assume a van't Hoff factor of 1.

Matter and Energy an Atomic Perspective

Atoms, Ions, and Molecules the Building Blocks of Matter

Atomic Structure Explaining the Properties of Elements

Chemical Bonding Understanding Climate Change

Bonding Theories Explaining Molecular Geometry

Intermolecular Forces Attractions Between Particles

Stoichiometry Mass Relationships and Chemical Reactions

Aqueous Solutions Chemistry of the Hydrosphere

Thermochemistry Energy Changes in Chemical Reactions

Properties of Gases the Air We Breathe

Thermodynamics Why Chemical Reactions Happen

Chemical Kinetics Clearing the Air

Chemical Equilibrium Equal but Opposite Reaction Rates

Acid-Base Equilibria Proton Transfer in Biological Systems

Additional Aqueous Equilibria Chemistry and the Oceans

Electrochemistry the Quest for Clean Energy

The Solid State a Particulate View

Organic Chemistry Fuels, Pharmaceuticals, and Modern Materials

Biochemistry the Compounds of Life

Nuclear Chemistry the Risks and Benefits

The Main Group Elements Life and the Periodic Table

Transition Metals Biological and Medical Applications

Filters

Exam 11: Properties of Solutions Their Concentrations and Colligative Properties

Which statement below regarding the liquid-gas phase transition and boiling is NOT correct?

At 25 °\degree° C, the vapor pressure of pure water is 25.756 mmHg.Starting with 250.0 g of water and solid glucose (C6H12O6, 180.16 g/mol), you must create an aqueous solution that has a vapor pressure reduction of 2.000 mmHg.How many grams of glucose do you need?

The vapor pressure of benzene (C6H6, 78.12 g/mol) at 25 °\degree° C is 0.1252 atm.What is the change in the vapor pressure when 10.00 g of naphthalene (C10H8, 128.2 g/mol) is dissolved in 0.2000 kg of C6H6?

The freezing point of a 0.0925 m solution of ammonium chloride was found to be -0.325 °\degree° C.What is the actual van 't Hoff factor for this salt at this concentration? (Kf (water) =1.86 °\degree° C/m)

What is the boiling point elevation constant of ethanol if a solution prepared by dissolving 56.00 g of glycerin (C3H8O3, 92.11 g/mol) in 240.0 g of ethanol (C2H6O, 46.08 g/mol) has a boiling point change of 3.014 °\degree° C?

Which statement below regarding evaporation and condensation of a liquid in a closed container is NOT correct?

A solution is prepared by mixing 45.68 g of carbon disulfide (CS2, 76.13 g/mol) with 16.42 g of acetonitrile (CH3CN, 41.06 g/mol).What is the partial pressure of CS2 in the vapor phase at 25 °\degree° C?

What information is provided by the van 't Hoff factor?

What is the osmotic pressure of a 0.300 M blood plasma sample at 37.0 °\degree° C? Assume a van't Hoff factor of 1.

Matter and Energy an Atomic Perspective

Atoms, Ions, and Molecules the Building Blocks of Matter

Atomic Structure Explaining the Properties of Elements

Chemical Bonding Understanding Climate Change

Bonding Theories Explaining Molecular Geometry

Intermolecular Forces Attractions Between Particles

Stoichiometry Mass Relationships and Chemical Reactions

Aqueous Solutions Chemistry of the Hydrosphere

Thermochemistry Energy Changes in Chemical Reactions

Properties of Gases the Air We Breathe

Thermodynamics Why Chemical Reactions Happen

Chemical Kinetics Clearing the Air

Chemical Equilibrium Equal but Opposite Reaction Rates

Acid-Base Equilibria Proton Transfer in Biological Systems

Additional Aqueous Equilibria Chemistry and the Oceans

Electrochemistry the Quest for Clean Energy

The Solid State a Particulate View

Organic Chemistry Fuels, Pharmaceuticals, and Modern Materials

Biochemistry the Compounds of Life

Nuclear Chemistry the Risks and Benefits

The Main Group Elements Life and the Periodic Table

Transition Metals Biological and Medical Applications

Filters

At 25 $\degree$ C, the vapor pressure of pure water is 25.756 mmHg.Starting with 250.0 g of water and solid glucose (C₆H₁₂O₆, 180.16 g/mol), you must create an aqueous solution that has a vapor pressure reduction of 2.000 mmHg.How many grams of glucose do you need?

The vapor pressure of benzene (C₆H₆, 78.12 g/mol) at 25 $\degree$ C is 0.1252 atm.What is the change in the vapor pressure when 10.00 g of naphthalene (C₁₀H₈, 128.2 g/mol) is dissolved in 0.2000 kg of C₆H₆?

The freezing point of a 0.0925 m solution of ammonium chloride was found to be -0.325 $\degree$ C.What is the actual van 't Hoff factor for this salt at this concentration? (K_f (water) =1.86 $\degree$ C/m)

What is the boiling point elevation constant of ethanol if a solution prepared by dissolving 56.00 g of glycerin (C₃H₈O₃, 92.11 g/mol) in 240.0 g of ethanol (C₂H₆O, 46.08 g/mol) has a boiling point change of 3.014 $\degree$ C?

What is the osmotic pressure of a 0.300 M blood plasma sample at 37.0 $\degree$ C? Assume a van't Hoff factor of 1.