Question 1

Heats of solution may be either positive or negative.

Accepted Answer

A) True 
 B)False

Question 2

Barbiturates are synthetic drugs used as sedatives and hypnotics.Barbital (  
= 184.2 g/mol)is one of the simplest of these drugs.What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid?
Kb = 3.07°C/m,boiling point of pure acetic acid = 117.9°C

Accepted Answer

A) 117.0°C 
B) 117.7°C 
C) 118.1°C 
D) 118.8°C 
E) >120°C 
A) 117.0°C 
B) 117.7°C 
C) 118.1°C 
D) 118.8°C 
E) >120°C

Question 3

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. 
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 4

The concentration of iodine in sea water is 60.parts per billion by mass.If one assumes that the iodine exists in the form of iodide anions,what is the molarity of iodide in sea water? (The density of sea water is 1.025 g/mL. )

Accepted Answer

A) 4.8 $\times$ 10-13 M 
B) 4.8 $\times$ 10-10 M 
C) 4.8 $\times$ 10-7 M 
D) 4.7 $\times$ 10-4 M 
E) 4.7 $\times$ 10-1 M 
A) 4.8 $\times$ 10-13 M 
B) 4.8 $\times$ 10-10 M 
C) 4.8 $\times$ 10-7 M 
D) 4.7 $\times$ 10-4 M 
E) 4.7 $\times$ 10-1 M

Question 5

A 0.137 m solution of sodium ferrocyanide (NaFe(CN)6.10H2O)in water has a freezing point depression of 0.755°C.Calculate the van't Hoff factor (i)under these conditions.(Kf = 1.86°C/m)

Accepted Answer

Question 6

A solution of sucrose (sugar)in water is in equilibrium with solid sucrose.If more solid sucrose is now added,with stirring,

Accepted Answer

A) the concentration of the solution will increase. 
B) the concentration of the solution will decrease. 
C) the concentration of the solution will remain the same. 
D) the volume of solution will increase. 
E) a supersaturated solution will be produced. 
A) the concentration of the solution will increase. 
B) the concentration of the solution will decrease. 
C) the concentration of the solution will remain the same. 
D) the volume of solution will increase. 
E) a supersaturated solution will be produced.

Question 7

If a solute dissolves in an endothermic process

Accepted Answer

A) H bonds must exist between solvent and solute. 
B) strong ion-dipole forces must exist in the solution. 
C) the solute must be a gas. 
D) the entropy of the solution is immaterial. 
E) the entropy of the solution must be greater than that of its pure components. 
A) H bonds must exist between solvent and solute. 
B) strong ion-dipole forces must exist in the solution. 
C) the solute must be a gas. 
D) the entropy of the solution is immaterial. 
E) the entropy of the solution must be greater than that of its pure components.

Question 8

Hexachlorophene is used as a disinfectant in germicidal soaps.What mass of hexachlorophene (  
= 406.9 g/mol)must be added to 125 g of chloroform to give a solution with a boiling point of 62.60°C?
Kb = 3.63°C/m,boiling point of pure chloroform = 61.70°C

Accepted Answer

A) 12.6 g 
B) 17.2 g 
C) 31.0 g 
D) 34.4 g 
E) 101 g 
A) 12.6 g 
B) 17.2 g 
C) 31.0 g 
D) 34.4 g 
E) 101 g

Question 9

The Henry's Law constant (k)for carbon monoxide in water at 25°C is 9.71 $\times$ 10-4 mol/(L·atm).How many grams of CO will dissolve in 1.00 L of water if the partial pressure of CO is 2.75 atm?

Accepted Answer

A) 3.53 $\times$ 10-4 g 
B) 2.67 $\times$ 10-3 g 
C) 9.89 $\times$ 10-3 g 
D) 7.48 $\times$ 10-2 g 
E) None of these choices is correct. 
A) 3.53 $\times$ 10-4 g 
B) 2.67 $\times$ 10-3 g 
C) 9.89 $\times$ 10-3 g 
D) 7.48 $\times$ 10-2 g 
E) None of these choices is correct.

Question 10

What volume of concentrated (14.7 M)phosphoric acid is needed to prepare 25.0 L of 3.0 M H3PO4?

Accepted Answer

A) 0.20 L 
B) 0.57 L 
C) 1.8 L 
D) 3.6 L 
E) 5.1 L 
A) 0.20 L 
B) 0.57 L 
C) 1.8 L 
D) 3.6 L 
E) 5.1 L

Question 11

Determine the freezing point of a solution which contains 0.31 mol of sucrose in 175 g of water.Kf = 1.86°C/m

Accepted Answer

A) 3.3°C 
B) 1.1°C 
C) 0.0°C 
D) -1.1°C 
E) -3.3°C 
A) 3.3°C 
B) 1.1°C 
C) 0.0°C 
D) -1.1°C 
E) -3.3°C

Question 12

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

Accepted Answer

A) 0.1 M NaI 
B) 0.2 M CuSO4 
C) 0.5 M KBr 
D) 2.0 M CuCl2 
E) 2.5 M CsCl 
A) 0.1 M NaI 
B) 0.2 M CuSO4 
C) 0.5 M KBr 
D) 2.0 M CuCl2 
E) 2.5 M CsCl

Question 13

In general,water is a good solvent for both polar and non-polar compounds.

Accepted Answer

A) True 
 B)False

Heats of solution may be either positive or negative.

Barbiturates are synthetic drugs used as sedatives and hypnotics.Barbital ( = 184.2 g/mol)is one of the simplest of these drugs.What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? K_b = 3.07°C/m,boiling point of pure acetic acid = 117.9°C

When two pure substances are mixed to form a solution

The concentration of iodine in sea water is 60.parts per billion by mass.If one assumes that the iodine exists in the form of iodide anions,what is the molarity of iodide in sea water? (The density of sea water is 1.025 g/mL. )

A 0.137 m solution of sodium ferrocyanide (NaFe(CN)₆.10H₂O)in water has a freezing point depression of 0.755°C.Calculate the van't Hoff factor (i)under these conditions.(K_f = 1.86°C/m)

A solution of sucrose (sugar)in water is in equilibrium with solid sucrose.If more solid sucrose is now added,with stirring,

If a solute dissolves in an endothermic process

Hexachlorophene is used as a disinfectant in germicidal soaps.What mass of hexachlorophene ( = 406.9 g/mol)must be added to 125 g of chloroform to give a solution with a boiling point of 62.60°C? K_b = 3.63°C/m,boiling point of pure chloroform = 61.70°C

The Henry's Law constant (k)for carbon monoxide in water at 25°C is 9.71 $\times$ 10^-4 mol/(L·atm).How many grams of CO will dissolve in 1.00 L of water if the partial pressure of CO is 2.75 atm?

What volume of concentrated (14.7 M)phosphoric acid is needed to prepare 25.0 L of 3.0 M H₃PO₄?

Determine the freezing point of a solution which contains 0.31 mol of sucrose in 175 g of water.K_f = 1.86°C/m

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

In general,water is a good solvent for both polar and non-polar compounds.

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids,solids,and Phase Changes

The Main-Group Elements: Applying Principles of Bonding and Structure

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Exam 13: The Properties of Solutions

Heats of solution may be either positive or negative.

Barbiturates are synthetic drugs used as sedatives and hypnotics.Barbital ( = 184.2 g/mol)is one of the simplest of these drugs.What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? Kb = 3.07°C/m,boiling point of pure acetic acid = 117.9°C

When two pure substances are mixed to form a solution

The concentration of iodine in sea water is 60.parts per billion by mass.If one assumes that the iodine exists in the form of iodide anions,what is the molarity of iodide in sea water? (The density of sea water is 1.025 g/mL. )

A 0.137 m solution of sodium ferrocyanide (NaFe(CN)6.10H2O)in water has a freezing point depression of 0.755°C.Calculate the van't Hoff factor (i)under these conditions.(Kf = 1.86°C/m)

A solution of sucrose (sugar)in water is in equilibrium with solid sucrose.If more solid sucrose is now added,with stirring,

If a solute dissolves in an endothermic process

Hexachlorophene is used as a disinfectant in germicidal soaps.What mass of hexachlorophene ( = 406.9 g/mol)must be added to 125 g of chloroform to give a solution with a boiling point of 62.60°C? Kb = 3.63°C/m,boiling point of pure chloroform = 61.70°C

The Henry's Law constant (k)for carbon monoxide in water at 25°C is 9.71 ×\times× 10-4 mol/(L·atm).How many grams of CO will dissolve in 1.00 L of water if the partial pressure of CO is 2.75 atm?

What volume of concentrated (14.7 M)phosphoric acid is needed to prepare 25.0 L of 3.0 M H3PO4?

Determine the freezing point of a solution which contains 0.31 mol of sucrose in 175 g of water.Kf = 1.86°C/m

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

In general,water is a good solvent for both polar and non-polar compounds.

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids,solids,and Phase Changes

The Main-Group Elements: Applying Principles of Bonding and Structure

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Barbiturates are synthetic drugs used as sedatives and hypnotics.Barbital ( = 184.2 g/mol)is one of the simplest of these drugs.What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? K_b = 3.07°C/m,boiling point of pure acetic acid = 117.9°C

A 0.137 m solution of sodium ferrocyanide (NaFe(CN)₆.10H₂O)in water has a freezing point depression of 0.755°C.Calculate the van't Hoff factor (i)under these conditions.(K_f = 1.86°C/m)

Hexachlorophene is used as a disinfectant in germicidal soaps.What mass of hexachlorophene ( = 406.9 g/mol)must be added to 125 g of chloroform to give a solution with a boiling point of 62.60°C? K_b = 3.63°C/m,boiling point of pure chloroform = 61.70°C

The Henry's Law constant (k)for carbon monoxide in water at 25°C is 9.71 $\times$ 10^-4 mol/(L·atm).How many grams of CO will dissolve in 1.00 L of water if the partial pressure of CO is 2.75 atm?

What volume of concentrated (14.7 M)phosphoric acid is needed to prepare 25.0 L of 3.0 M H₃PO₄?

Determine the freezing point of a solution which contains 0.31 mol of sucrose in 175 g of water.K_f = 1.86°C/m