Question 1

Which of the following should have the largest Henry's law constant (kH)in water?

Accepted Answer

A)  Ne 
B)  CO 
C)  Br2 
D)  CH3CH3 
E)  CO2 
A)  Ne 
B)  CO 
C)  Br2 
D)  CH3CH3 
E)  CO2

Question 2

Give the major force in seawater.

Accepted Answer

A)  dipole-dipole 
B)  dispersion 
C)  hydrogen bonding 
D)  ion-ion 
E)  ion-dipole 
A)  dipole-dipole 
B)  dispersion 
C)  hydrogen bonding 
D)  ion-ion 
E)  ion-dipole

Question 3

What is the mole fraction of oxygen in a gas mixture that is 37% oxygen and 63% nitrogen by volume?

Accepted Answer

A)  0.34 
B)  0.37 
C)  0.25 
D)  0.52 
A)  0.34 
B)  0.37 
C)  0.25 
D)  0.52

Question 4

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

Accepted Answer

A)  nonelectrolyte 
B)  K I 
C)  MgSO4 
D)  Ca Cl2 
E)  AlCl3 
A)  nonelectrolyte 
B)  K I 
C)  MgSO4 
D)  Ca Cl2 
E)  AlCl3

Question 5

Under a pressure of 298 atm at 25°C,a gas was found to have a concentration of 0.182M.What is the identity of the gas?

Accepted Answer

A)  CO2 
B)  F2 
C)  CO 
D)  N2 
E)  Ar 
A)  CO2 
B)  F2 
C)  CO 
D)  N2 
E)  Ar

Question 6

Dynamic equilibrium can be defined as

Accepted Answer

A)  rate of dissolution = rate of deposition. 
B)  rate of dissolution  rate of deposition. 
D)  rate of bubbling > rate of dissolving 
E)  rate of condensing > rate of bubbling 
A)  rate of dissolution = rate of deposition. 
B)  rate of dissolution  rate of deposition. 
D)  rate of bubbling > rate of dissolving 
E)  rate of condensing > rate of bubbling

Question 7

The boiling point elevation of an aqueous sucrose solution is found to be 0.39°C.What mass of sucrose (molar mass= 342.30 g/mol)would be needed to dissolve in 500.0 g of water? Kb (water)= 0.512°C/m.

Accepted Answer

A)  261 g sucrose 
B)  528 g sucrose 
C)  762 g sucrose 
D)  223 g sucrose 
E)  130. g sucrose 
A)  261 g sucrose 
B)  528 g sucrose 
C)  762 g sucrose 
D)  223 g sucrose 
E)  130. g sucrose

Question 8

The Henry's law constant for helium gas in water at 30°C is 3.70 × 10-4 M/atm.When the partial pressure of helium above a sample of water is 0.650 atm,the concentration of helium in the water is ________ M.

Accepted Answer

A)  5.69 × 10-4 
B)  1.76 × 103 
C)  1.30 
D)  2.41 × 10-4 
E)  3.70 × 10-4 
A)  5.69 × 10-4 
B)  1.76 × 103 
C)  1.30 
D)  2.41 × 10-4 
E)  3.70 × 10-4

Question 9

Parts per million requires a multiplication factor of

Accepted Answer

A)  10-9 
B)  10-3 
C)  103 
D)  1015 
E)  106 
A)  10-9 
B)  10-3 
C)  103 
D)  1015 
E)  106

Question 10

Which of the following solutions will have the lowest freezing point?

Accepted Answer

A)  0.010 m K Br 
B)  0.010 m Na2CO3 
C)  0.035 m CH3CH2OH  
D)  0.015 m BaCl2 
A)  0.010 m K Br 
B)  0.010 m Na2CO3 
C)  0.035 m CH3CH2OH  
D)  0.015 m BaCl2

Question 11

A sealed container contains 0.352 L of water with an atmosphere of oxygen gas.What is the concentration of O2 in the water if the external pressure is 4.24 atm given that kH for O2 is 1.66 × 10-6 M/mm Hg at this temperature?

Accepted Answer

A)  5.34 × 10-3 M 
B)  1.53 × 10-3 M 
C)  9.46 × 10-2 M 
D)  5.34 × 10-2 M 
E)  3.82 × 10-4 M 
A)  5.34 × 10-3 M 
B)  1.53 × 10-3 M 
C)  9.46 × 10-2 M 
D)  5.34 × 10-2 M 
E)  3.82 × 10-4 M

Question 12

What volume of 3.00 M CH3OH solution is needed to provide 0.220 mol of CH3OH?

Accepted Answer

A)  1.52 mL 
B)  13.6 mL 
C)  73.3 mL 
D)  660 mL 
A)  1.52 mL 
B)  13.6 mL 
C)  73.3 mL 
D)  660 mL

Question 13

Give the term for the amount of solute in moles per kilogram of solvent.

Accepted Answer

A)  molality 
B)  molarity 
C)  mole fraction 
D)  mole percent 
E)  mass percent 
A)  molality 
B)  molarity 
C)  mole fraction 
D)  mole percent 
E)  mass percent

Question 14

Which of the following concentration units are temperature dependent?

Accepted Answer

A)  mole fraction 
B)  molality 
C)  mass percent 
D)  molarity 
E)  none of the above 
A)  mole fraction 
B)  molality 
C)  mass percent 
D)  molarity 
E)  none of the above

Question 15

how many grams of CCl4 are needed to make a 1.20 m solution in 450g of octane?

Accepted Answer

A)  127.4 g 
B)  184.6 g 
C)  221.5 g 
D)  83.06 g 
E)  62.22 g 
A)  127.4 g 
B)  184.6 g 
C)  221.5 g 
D)  83.06 g 
E)  62.22 g

Question 16

What is the mol fraction of ethanol,C2H5OH,in a solution of 75.3g of ethanol and 525g of water?

Accepted Answer

A)  0.0531 
B)  0.127 
C)  0.947 
D)  0.239 
E)  0.0237 
A)  0.0531 
B)  0.127 
C)  0.947 
D)  0.239 
E)  0.0237

Question 17

Which of the following ions should have the most exothermic ΔHhydration?

Accepted Answer

A)  Na⁺ 
B)  Ba2⁺ 
C)  Al3⁺ 
D)  Ca2⁺ 
E)  Sr2⁺ 
A)  Na⁺ 
B)  Ba2⁺ 
C)  Al3⁺ 
D)  Ca2⁺ 
E)  Sr2⁺

Question 18

Identify the colligative property.

Accepted Answer

A)  vapor pressure lowering 
B)  freezing point depression 
C)  boiling point elevation 
D)  osmotic pressure 
E)  all of the above 
A)  vapor pressure lowering 
B)  freezing point depression 
C)  boiling point elevation 
D)  osmotic pressure 
E)  all of the above

Question 19

Calculate the mole fraction of Ba I2 in an aqueous solution prepared by dissolving 0.400 moles of Ba I2 in 850.0 g of water.

Accepted Answer

A)  0.00841 
B)  0.0270 
C)  0.00900 
D)  0.0248 
E)  0.0167 
A)  0.00841 
B)  0.0270 
C)  0.00900 
D)  0.0248 
E)  0.0167

Question 20

What is the molecular weight of a polymer if 3.50 g are dissolved in enough water to give 252 mL of the solution and give a osmotic pressure of 28.52 mm Hg at 25°C?

Accepted Answer

A)  6.49 × 105 g/mol 
B)  9.05 × 103 g/mol 
C)  2.63 × 103 g/mol 
D)  28.5 g/mol 
E)  8.88 × 104 g/mol 
A)  6.49 × 105 g/mol 
B)  9.05 × 103 g/mol 
C)  2.63 × 103 g/mol 
D)  28.5 g/mol 
E)  8.88 × 104 g/mol

Exam 14: Solutions

Which of the following should have the largest Henry's law constant (kH)in water?

Give the major force in seawater.

What is the mole fraction of oxygen in a gas mixture that is 37% oxygen and 63% nitrogen by volume?

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

Under a pressure of 298 atm at 25°C,a gas was found to have a concentration of 0.182M.What is the identity of the gas?

Dynamic equilibrium can be defined as

The boiling point elevation of an aqueous sucrose solution is found to be 0.39°C.What mass of sucrose (molar mass= 342.30 g/mol)would be needed to dissolve in 500.0 g of water? Kb (water)= 0.512°C/m.

The Henry's law constant for helium gas in water at 30°C is 3.70 × 10-4 M/atm.When the partial pressure of helium above a sample of water is 0.650 atm,the concentration of helium in the water is ________ M.

Parts per million requires a multiplication factor of

Which of the following solutions will have the lowest freezing point?

A sealed container contains 0.352 L of water with an atmosphere of oxygen gas.What is the concentration of O2 in the water if the external pressure is 4.24 atm given that kH for O2 is 1.66 × 10-6 M/mm Hg at this temperature?

What volume of 3.00 M CH3OH solution is needed to provide 0.220 mol of CH3OH?

Give the term for the amount of solute in moles per kilogram of solvent.

Which of the following concentration units are temperature dependent?

how many grams of CCl4 are needed to make a 1.20 m solution in 450g of octane?

What is the mol fraction of ethanol,C2H5OH,in a solution of 75.3g of ethanol and 525g of water?

Which of the following ions should have the most exothermic ΔHhydration?

Identify the colligative property.

Calculate the mole fraction of Ba I2 in an aqueous solution prepared by dissolving 0.400 moles of Ba I2 in 850.0 g of water.

What is the molecular weight of a polymer if 3.50 g are dissolved in enough water to give 252 mL of the solution and give a osmotic pressure of 28.52 mm Hg at 25°C?

Essentials: Units, Measurements, and Problem Solving

Atoms

The Quantum Mechanical Model of the Atom

Periodic Properties of the Elements

Molecules and Compounds

Chemical Bonding I

Chemical Bonding Ii

Chemical Reactions and Chemical Quantities

Introduction to Solutions and Aqueous Reactions

Thermochemistry

Gases

Liquids, Solids, and Intermolecular Forces

Crystalline Solids and Modern Materials

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry

Transition Metals and Coordination Compounds

Filters

Which of the following should have the largest Henry's law constant (k_H)in water?

The boiling point elevation of an aqueous sucrose solution is found to be 0.39°C.What mass of sucrose (molar mass= 342.30 g/mol)would be needed to dissolve in 500.0 g of water? K_b (water)= 0.512°C/m.

The Henry's law constant for helium gas in water at 30°C is 3.70 × 10^-4 M/atm.When the partial pressure of helium above a sample of water is 0.650 atm,the concentration of helium in the water is ________ M.

A sealed container contains 0.352 L of water with an atmosphere of oxygen gas.What is the concentration of O₂ in the water if the external pressure is 4.24 atm given that k_H for O₂is 1.66 × 10^-6 M/mm Hg at this temperature?

What volume of 3.00 M CH₃OH solution is needed to provide 0.220 mol of CH₃OH?

how many grams of CCl₄ are needed to make a 1.20 m solution in 450g of octane?

What is the mol fraction of ethanol,C₂H₅OH,in a solution of 75.3g of ethanol and 525g of water?

Which of the following ions should have the most exothermic ΔH_hydration?

Calculate the mole fraction of Ba I₂ in an aqueous solution prepared by dissolving 0.400 moles of Ba I₂ in 850.0 g of water.