Question 1

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 2

At 20°C,an aqueous solution that is 24.0% by mass in ammonium chloride has a density of 1.0674 g/mL.  What is the molarity of ammonium chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol.

Accepted Answer

A)  5.90 M 
B)  0.479 M 
C)  4.79 M 
D)  0.0445 M 
E)  22.5 M 
A)  5.90 M 
B)  0.479 M 
C)  4.79 M 
D)  0.0445 M 
E)  22.5 M

Question 3

Determine the solubility of CO2 in soda water at 25°C if the pressure of CO2 is 5.6 atm.The Henry's law constant for carbon dioxide in water at this temperature is 3.4 × 10-2 M/atm.

Accepted Answer

A)  0.16 M 
B)  0.53 M 
C)  0.61 M 
D)  0.19 M 
E)  0.78 M 
A)  0.16 M 
B)  0.53 M 
C)  0.61 M 
D)  0.19 M 
E)  0.78 M

Question 4

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 5

Describe what happens when seawater is consumed to quench thirst.

Accepted Answer

A)  Seawater can quench thirst once it is boiled. 
B)  Seawater quenches thirst when directly ingested. 
C)  Seawater draws water out of the body resulting in further dehydration and diarrhea. 
D)  Seawater helps diarrhea. 
E)  Seawater must be ingested at twice the volume to quench thirst. 
A)  Seawater can quench thirst once it is boiled. 
B)  Seawater quenches thirst when directly ingested. 
C)  Seawater draws water out of the body resulting in further dehydration and diarrhea. 
D)  Seawater helps diarrhea. 
E)  Seawater must be ingested at twice the volume to quench thirst.

Question 6

Which cation in each set is expected to have the larger (more negative)hydration energy? I Be2+ or Ca2+
II Rb+ or Zn2+

Accepted Answer

A)  Be2+ in set I and Rb+ in set II 
B)  Be2+ in set I and Zn2+ in set II 
C)  Ca2+ in set I and Rb+ in set II 
D)  Ca2+ in set I and Zn2+ in set II 
A)  Be2+ in set I and Rb+ in set II 
B)  Be2+ in set I and Zn2+ in set II 
C)  Ca2+ in set I and Rb+ in set II 
D)  Ca2+ in set I and Zn2+ in set II

Question 7

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

Accepted Answer

A)  Rb⁺ 
B)  Ba2⁺ 
C)  Al3⁺ 
D)  Sr2⁺ 
E)  Ni2⁺ 
A)  Rb⁺ 
B)  Ba2⁺ 
C)  Al3⁺ 
D)  Sr2⁺ 
E)  Ni2⁺

Question 8

A solution containing less than the equilibrium amount is called

Accepted Answer

A)  an unsaturated solution. 
B)  a dilute solution. 
C)  a supersaturated solution. 
D)  a concentrated solution. 
E)  a saturated solution. 
A)  an unsaturated solution. 
B)  a dilute solution. 
C)  a supersaturated solution. 
D)  a concentrated solution. 
E)  a saturated solution.

Question 9

Give the major force between ethanol and rubbing alcohol.

Accepted Answer

A)  dipole-dipole 
B)  ionic forces 
C)  hydrogen bonding 
D)  ion-ion 
E)  oxygen bonding 
A)  dipole-dipole 
B)  ionic forces 
C)  hydrogen bonding 
D)  ion-ion 
E)  oxygen bonding

Question 10

An aqueous solution has a normal boiling point of 103.0°C.What is the freezing point of this solution? For water Kb = 0.51°C/m and Kf = 1.86°C/m.

Accepted Answer

A)  -0.82°C 
B)  -3.0°C 
C)  -3.6°C 
D)  -11°C 
A)  -0.82°C 
B)  -3.0°C 
C)  -3.6°C 
D)  -11°C

Question 11

Determine ΔHsolute for KBr if the ΔHsolution (KBr)= +19.9 kJ/mol and the ΔHhydration(KBr)= -670.kJ/mol.

Accepted Answer

A)  +650 kJ/mol 
B)  -650 kJ/mol 
C)  +690 kJ/mol 
D)  -710 kJ/mol 
E)  -690 kJ/mol 
A)  +650 kJ/mol 
B)  -650 kJ/mol 
C)  +690 kJ/mol 
D)  -710 kJ/mol 
E)  -690 kJ/mol

Question 12

Dynamic equilibrium can be defined as

Accepted Answer

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

Question 13

Place the following aqueous solutions of nonvolatile,nonionic compounds in order of decreasing osmotic pressure. I.0.011 M ethanol II.0.00095 M fructose III.0.0060 M glycerin

Accepted Answer

A)  I > III > II 
B)  I > II > III 
C)  II > III > I 
D)  III > I > II 
E)  II > I > III 
A)  I > III > II 
B)  I > II > III 
C)  II > III > I 
D)  III > I > II 
E)  II > I > III

Question 14

What is the freezing point of a solution of 7.15 g MgCl2 in 100 g of water? Kf for water is 1.86°C/m.

Accepted Answer

A)  -0.140°C 
B)  -1.40°C 
C)  -2.80°C 
D)  -4.18°C 
A)  -0.140°C 
B)  -1.40°C 
C)  -2.80°C 
D)  -4.18°C

Question 15

Commercial grade HCl solutions are typically 39.0% (by mass)HCl in water.Determine the molality of the HCl,if the solution has a density of 1.20 g/mL.

Accepted Answer

A)  39.0 m 
B)  17.5 m 
C)  6.39 m 
D)  10.7 m 
E)  9.44 m 
A)  39.0 m 
B)  17.5 m 
C)  6.39 m 
D)  10.7 m 
E)  9.44 m

Question 16

Determine the partial pressure of oxygen necessary to form an aqueous solution that is 7.1 × 10-4 M O2 at 25°C.The Henry's law constant for oxygen in water at 25°C is
1)3 × 10-3 M/atm.

Accepted Answer

A)  1.1 atm 
B)  0.92 atm 
C)  0.88 atm 
D)  1.8 atm 
E)  0.55 atm 
A)  1.1 atm 
B)  0.92 atm 
C)  0.88 atm 
D)  1.8 atm 
E)  0.55 atm

Question 17

A solution of LiCl in water is 20.0 wt% LiCl.What is the mole fraction of LiCl?

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 18

Which of the following compounds is most soluble in hexane (CH3CH2CH2CH2CH2CH2CH3)?

Accepted Answer

A)  methanol 
B)  ethanol 
C)  1-propanol 
D)  1-butanol 
E)  1-pentanol 
A)  methanol 
B)  ethanol 
C)  1-propanol 
D)  1-butanol 
E)  1-pentanol

Question 19

A solution is prepared by dissolving 52.3 g of RbCl in enough water to form 502 mL of solution.Calculate the mass % of RbCl in the solution if the density is 1.12 g/mL.

Accepted Answer

A)  10.4% 
B)  8.57% 
C)  10.1% 
D)  11.7% 
E)  9.30% 
A)  10.4% 
B)  8.57% 
C)  10.1% 
D)  11.7% 
E)  9.30%

Question 20

Which of the following compounds will be most soluble in nonane (C9H20)?

Accepted Answer

A)  1-pentanol 
B)  benzene 
C)  acetic acid 
D)  ethyl methyl ketone 
E)  ethanol 
A)  1-pentanol 
B)  benzene 
C)  acetic acid 
D)  ethyl methyl ketone 
E)  ethanol

Exam 13: Solutions

Identify the classification of whipped cream.

At 20°C,an aqueous solution that is 24.0% by mass in ammonium chloride has a density of 1.0674 g/mL. What is the molarity of ammonium chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol.

Determine the solubility of CO2 in soda water at 25°C if the pressure of CO2 is 5.6 atm.The Henry's law constant for carbon dioxide in water at this temperature is 3.4 × 10-2 M/atm.

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

Describe what happens when seawater is consumed to quench thirst.

Which cation in each set is expected to have the larger (more negative)hydration energy? I Be2+ or Ca2+ II Rb+ or Zn2+

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

A solution containing less than the equilibrium amount is called

Give the major force between ethanol and rubbing alcohol.

An aqueous solution has a normal boiling point of 103.0°C.What is the freezing point of this solution? For water Kb = 0.51°C/m and Kf = 1.86°C/m.

Determine ΔHsolute for KBr if the ΔHsolution (KBr)= +19.9 kJ/mol and the ΔHhydration(KBr)= -670.kJ/mol.

Dynamic equilibrium can be defined as

Place the following aqueous solutions of nonvolatile,nonionic compounds in order of decreasing osmotic pressure. I.0.011 M ethanol II.0.00095 M fructose III.0.0060 M glycerin

What is the freezing point of a solution of 7.15 g MgCl2 in 100 g of water? Kf for water is 1.86°C/m.

Commercial grade HCl solutions are typically 39.0% (by mass)HCl in water.Determine the molality of the HCl,if the solution has a density of 1.20 g/mL.

Determine the partial pressure of oxygen necessary to form an aqueous solution that is 7.1 × 10-4 M O2 at 25°C.The Henry's law constant for oxygen in water at 25°C is 1)3 × 10-3 M/atm.

A solution of LiCl in water is 20.0 wt% LiCl.What is the mole fraction of LiCl?

Which of the following compounds is most soluble in hexane (CH3CH2CH2CH2CH2CH2CH3)?

A solution is prepared by dissolving 52.3 g of RbCl in enough water to form 502 mL of solution.Calculate the mass % of RbCl in the solution if the density is 1.12 g/mL.

Which of the following compounds will be most soluble in nonane (C9H20)?

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Filters

At 20°C,an aqueous solution that is 24.0% by mass in ammonium chloride has a density of 1.0674 g/mL. What is the molarity of ammonium chloride in the solution? The formula weight of NH₄Cl is 53.50 g/mol.

Determine the solubility of CO₂ in soda water at 25°C if the pressure of CO₂ is 5.6 atm.The Henry's law constant for carbon dioxide in water at this temperature is 3.4 × 10^-2 M/atm.

Which cation in each set is expected to have the larger (more negative)hydration energy? I Be²⁺ or Ca²⁺ II Rb⁺ or Zn²⁺

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

An aqueous solution has a normal boiling point of 103.0°C.What is the freezing point of this solution? For water K_b = 0.51°C/m and K_f = 1.86°C/m.

Determine ΔH_solute for KBr if the ΔH_solution(KBr)= +19.9 kJ/mol and the ΔH_hydration(KBr)= -670.kJ/mol.

What is the freezing point of a solution of 7.15 g MgCl₂ in 100 g of water? K_f for water is 1.86°C/m.

Determine the partial pressure of oxygen necessary to form an aqueous solution that is 7.1 × 10^-4M O₂ at 25°C.The Henry's law constant for oxygen in water at 25°C is 1)3 × 10^-3 M/atm.

Which of the following compounds is most soluble in hexane (CH₃CH₂CH₂CH₂CH₂CH₂CH₃)?

Which of the following compounds will be most soluble in nonane (C₉H₂₀)?