Question 1

A solid can be purified through what technique?

Accepted Answer

A)  recrystallization 
B)  dilution 
C)  dissolution 
D)  boiling 
E)  melting 
A)  recrystallization 
B)  dilution 
C)  dissolution 
D)  boiling 
E)  melting A

Question 2

A KCl solution is prepared by dissolving 25.0 g KCl in 250.0 g of water at 25°C.What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg?

Accepted Answer

A)  21.6 mm Hg 
B)  22.7 mm Hg 
C)  23.2 mm Hg 
D)  24.9 mm Hg 
A)  21.6 mm Hg 
B)  22.7 mm Hg 
C)  23.2 mm Hg 
D)  24.9 mm Hg B

Question 3

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

Accepted Answer

A)  nonelectrolyte 
B)  KI 
C)  MgSO4 
D)  CaCl2 
E)  AlCl3 
A)  nonelectrolyte 
B)  KI 
C)  MgSO4 
D)  CaCl2 
E)  AlCl3 E

Question 4

Which of the following statements is TRUE?

Accepted Answer

A)  In general, the solubility of a solid in water decreases with increasing temperature. 
B)  In general, the solubility of a gas in water decreases with increasing temperature. 
C)  The solubility of a gas in water usually increases with decreasing pressure. 
D)  The solubility of an ionic solid in water decreases with increasing temperature. 
E)  None of the above statements is true. 
A)  In general, the solubility of a solid in water decreases with increasing temperature. 
B)  In general, the solubility of a gas in water decreases with increasing temperature. 
C)  The solubility of a gas in water usually increases with decreasing pressure. 
D)  The solubility of an ionic solid in water decreases with increasing temperature. 
E)  None of the above statements is true.

Question 5

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 6

How many moles of LiBr are contained in 347 g of water in a 0.175 m LiBr solution?

Accepted Answer

A)  1.65 × 10-2 mol LiBr 
B)  5.04 × 10-2 mol LiBr 
C)  6.07 × 10-2 mol LiBr 
D)  3.22 × 10-2 mol LiBr 
E)  1.98 × 10-2 mol LiBr 
A)  1.65 × 10-2 mol LiBr 
B)  5.04 × 10-2 mol LiBr 
C)  6.07 × 10-2 mol LiBr 
D)  3.22 × 10-2 mol LiBr 
E)  1.98 × 10-2 mol LiBr

Question 7

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 8

A solution in which the dissolved solute is in dynamic equilibrium with the solid solute 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

To make a 0.500 M solution,one could take 0.500 moles of solute and add

Accepted Answer

A)  6.00 L of solvent. 
B)  6.00 kg of solvent. 
C)  enough solvent to make 1.00 L of solution. 
D)  enough solvent to make 1.00 kg of solution. 
A)  6.00 L of solvent. 
B)  6.00 kg of solvent. 
C)  enough solvent to make 1.00 L of solution. 
D)  enough solvent to make 1.00 kg of solution.

Question 10

A solution is 0.0460 m NaBr.What is the molarity of the solution if the density is 1.10 g/mL?

Accepted Answer

A)  0.0441 M 
B)  0.0460 M 
C)  0.0418 M 
D)  0.0506 M 
E)  0.0417 M 
A)  0.0441 M 
B)  0.0460 M 
C)  0.0418 M 
D)  0.0506 M 
E)  0.0417 M

Question 11

________ is the gas dissolved in carbonated drinks.

Accepted Answer

A)  Carbon dioxide 
B)  Nitrogen 
C)  Helium 
D)  Hydrogen 
E)  Oxygen 
A)  Carbon dioxide 
B)  Nitrogen 
C)  Helium 
D)  Hydrogen 
E)  Oxygen

Question 12

Place the following solutions in order of increasing osmotic pressure. I.0.15 M C2H6O2 II.0.15 M SrCl2 III.0.15 M NaF

Accepted Answer

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

Question 13

What mass of ethane is contained in 20.0 mL of a 13.9% by mass solution of ethane in hexane? The density of the solution is 0.611 g/mL.

Accepted Answer

A)  2.35 g 
B)  8.49 g 
C)  11.8 g 
D)  2.20 g 
E)  1.70 g 
A)  2.35 g 
B)  8.49 g 
C)  11.8 g 
D)  2.20 g 
E)  1.70 g

Question 14

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

Accepted Answer

A)  0.010 m NH4Cl 
B)  0.010 m Li2CO3 
C)  0.035 m CH3CH2CH2OH 
D)  0.015 m CaI2 
A)  0.010 m NH4Cl 
B)  0.010 m Li2CO3 
C)  0.035 m CH3CH2CH2OH 
D)  0.015 m CaI2

Question 15

Calculate the mole fraction of the total ions in an aqueous solution prepared by dissolving 0.400 moles of CaF2 in 850.0 g of water.

Accepted Answer

A)  0.00841 
B)  0.0540 
C)  0.01800 
D)  0.0248 
E)  0.0167 
A)  0.00841 
B)  0.0540 
C)  0.01800 
D)  0.0248 
E)  0.0167

Question 16

A solution is prepared by dissolving 96.4 g of RbI in enough water to form 865 mL of solution.Calculate the mass % of the solution if the density of the solution is 1.06 g/mL.

Accepted Answer

A)  11.3% 
B)  12.7% 
C)  9.4% 
D)  10.5% 
E)  11.9% 
A)  11.3% 
B)  12.7% 
C)  9.4% 
D)  10.5% 
E)  11.9%

Question 17

To make a 0.250 m solution,one could take 0.250 moles of solute and add

Accepted Answer

A)  1.00 L of solvent. 
B)  1.00 kg of solvent. 
C)  enough solvent to make 1.00 L of solution. 
D)  enough solvent to make 1.00 kg of solution. 
E)  4.00 L of solvent. 
A)  1.00 L of solvent. 
B)  1.00 kg of solvent. 
C)  enough solvent to make 1.00 L of solution. 
D)  enough solvent to make 1.00 kg of solution. 
E)  4.00 L of solvent.

Question 18

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 19

A solution is prepared by adding 1.20 mol of KCl to 889 g of water.The concentration of KCl is ________ molal.

Accepted Answer

A)  1.35 × 10-3 
B)  741 
C)  0.741 
D)  1.07 × 103 
E)  1.35 
A)  1.35 × 10-3 
B)  741 
C)  0.741 
D)  1.07 × 103 
E)  1.35

Question 20

A solution is prepared by dissolving 40.0 g of sucrose,C12H22O11,in 250.g of water at 25°C.What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg?

Accepted Answer

A)  0.198 mm Hg 
B)  20.5 mm Hg 
C)  23.6 mm Hg 
D)  24.0 mm Hg 
A)  0.198 mm Hg 
B)  20.5 mm Hg 
C)  23.6 mm Hg 
D)  24.0 mm Hg

Exam 13: Solutions

A solid can be purified through what technique?

A KCl solution is prepared by dissolving 25.0 g KCl in 250.0 g of water at 25°C.What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg?

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

Which of the following statements is TRUE?

Identify the colligative property.

How many moles of LiBr are contained in 347 g of water in a 0.175 m LiBr solution?

Parts per million requires a multiplication factor of ________.

A solution in which the dissolved solute is in dynamic equilibrium with the solid solute is called

To make a 0.500 M solution,one could take 0.500 moles of solute and add

A solution is 0.0460 m NaBr.What is the molarity of the solution if the density is 1.10 g/mL?

________ is the gas dissolved in carbonated drinks.

Place the following solutions in order of increasing osmotic pressure. I.0.15 M C2H6O2 II.0.15 M SrCl2 III.0.15 M NaF

What mass of ethane is contained in 20.0 mL of a 13.9% by mass solution of ethane in hexane? The density of the solution is 0.611 g/mL.

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

Calculate the mole fraction of the total ions in an aqueous solution prepared by dissolving 0.400 moles of CaF2 in 850.0 g of water.

A solution is prepared by dissolving 96.4 g of RbI in enough water to form 865 mL of solution.Calculate the mass % of the solution if the density of the solution is 1.06 g/mL.

To make a 0.250 m solution,one could take 0.250 moles of solute and add

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.

A solution is prepared by adding 1.20 mol of KCl to 889 g of water.The concentration of KCl is ________ molal.

A solution is prepared by dissolving 40.0 g of sucrose,C12H22O11,in 250.g of water at 25°C.What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg?

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Filters

Place the following solutions in order of increasing osmotic pressure. I.0.15 M C₂H₆O₂ II.0.15 M SrCl₂ III.0.15 M NaF

Calculate the mole fraction of the total ions in an aqueous solution prepared by dissolving 0.400 moles of CaF₂ in 850.0 g of 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.

A solution is prepared by dissolving 40.0 g of sucrose,C₁₂H₂₂O₁₁,in 250.g of water at 25°C.What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg?