Question 1

When making some iced tea,you find that you can dissolve 100 grams of table sugar in a liter of tea at 20 oC.Based on this,what did you learn?

Accepted Answer

A)  Based on the solubility,tea must be a nonpolar solvent. 
B)  The solubility of table sugar in tea at 20 oC is 100 g/L 
C)  Table sugar must be a strong electrolyte. 
D)  You can dissolved 100 grams of sugar in tea at 20 oC 
A)  Based on the solubility,tea must be a nonpolar solvent. 
B)  The solubility of table sugar in tea at 20 oC is 100 g/L 
C)  Table sugar must be a strong electrolyte. 
D)  You can dissolved 100 grams of sugar in tea at 20 oC

Question 2

Citric acid,a natural food preservative,accounts for the tartness of citrus fruits.It is shown below.About 730 g of this material can be dissolved in water,making a liter of solution.However,only about 1.5% of it dissociates.As such,it would be considered a _____.

Accepted Answer

A)  nonelectrolyte 
B)  strong electrolyte 
C)  pseudoelectrolyte 
D)  weak electrolyte 
A)  nonelectrolyte 
B)  strong electrolyte 
C)  pseudoelectrolyte 
D)  weak electrolyte

Question 3

A solution is prepared by dissolving 4.66 g of KCl in enough distilled water to give 250 mL of solution.KCl is a strong electrolyte.How will the freezing point of the solution be different from that of pure water? (Note: Kf for water is 1.86°C/M. )

Accepted Answer

A)  solution will be 0.930°C lower than water 
B)  solution will be 0.475°C lower than pure water 
C)  solution will be 0.930°C higher than pure water 
D)  solution will be 0.475°C higher than pure water 
A)  solution will be 0.930°C lower than water 
B)  solution will be 0.475°C lower than pure water 
C)  solution will be 0.930°C higher than pure water 
D)  solution will be 0.475°C higher than pure water

Question 4

Colloids are considered to be homogenous mixtures.

Accepted Answer

A) True 
 B)False

Question 5

What volume of ethyl alcohol is contained in 35 mL (1 oz. )of 86 proof liquor,which is 43% (v/v)alcohol?

Accepted Answer

A)  30 mL 
B)  43 mL 
C)  15 mL 
D)  37 mL 
A)  30 mL 
B)  43 mL 
C)  15 mL 
D)  37 mL

Question 6

The ability to see the scattering of light when passed through a colloid is known as

Accepted Answer

A)  the dispersing effect. 
B)  a scattering ratio. 
C)  an emulsifying agent. 
D)  the Tyndall effect. 
A)  the dispersing effect. 
B)  a scattering ratio. 
C)  an emulsifying agent. 
D)  the Tyndall effect.

Question 7

Oil should be a good solvent for polar compounds.

Accepted Answer

A) True 
 B)False

Question 8

A colligative property

Accepted Answer

A)  will only occur for aqueous solutions. 
B)  depends only on the number of species added to a solution. 
C)  results from increasing vapor pressure as a solute is added to a solvent. 
D)  All of the choices. 
A)  will only occur for aqueous solutions. 
B)  depends only on the number of species added to a solution. 
C)  results from increasing vapor pressure as a solute is added to a solvent. 
D)  All of the choices.

Question 9

A mixture of sand and water would be an example of a colloidal suspension.

Accepted Answer

A) True 
 B)False

Question 10

The boiling point of a solution of sugar water is

Accepted Answer

A)  higher than that of pure solvent. 
B)  the same as that of pure solvent. 
C)  lower than that of pure solvent. 
D)  impossible to determine. 
A)  higher than that of pure solvent. 
B)  the same as that of pure solvent. 
C)  lower than that of pure solvent. 
D)  impossible to determine.

Question 11

Weight-volume percentage solutions must be made in 100 mL increments.

Accepted Answer

A) True 
 B)False

Question 12

You have a patient who is suffering from the "bends".What gas is in excess in the blood?

Accepted Answer

A)  nitrogen 
B)  oxygen 
C)  helium 
D)  all of these 
A)  nitrogen 
B)  oxygen 
C)  helium 
D)  all of these

Question 13

Which compound is most soluble in a polar solvent?

Accepted Answer

A)  silver nitrate 
B)  silver chloride 
C)  silver carbonate 
D)  all are of equal solubility 
A)  silver nitrate 
B)  silver chloride 
C)  silver carbonate 
D)  all are of equal solubility

Question 14

There is a 12 M aqueous HCl solution in the stock room,but a 6 M solution is required for an experiment.Doubling the volume of a 12 M sample with water will produce a 6 M solution.

Accepted Answer

A) True 
 B)False

Question 15

The spores from many molds produce an allergic reaction in many individuals.If mold spores in the air were to be considered a colloid,which technique would remove the spores best from a functioning air conditioner duct?

Accepted Answer

A)  Place a filter made from woven fiberglass fibers in the duct. 
B)  Install an electrical device with both positive and negative poles. 
C)  Install an ultraviolet light producing device in the duct. 
D)  All of these responses work to the same extent. 
A)  Place a filter made from woven fiberglass fibers in the duct. 
B)  Install an electrical device with both positive and negative poles. 
C)  Install an ultraviolet light producing device in the duct. 
D)  All of these responses work to the same extent.

Question 16

Which of the following correctly arranges 1.00 M solutions of the strong electrolytes in order of increasing boiling point (lowest to highest)?

Accepted Answer

A) 
  
B) 
  
C) 
  
D)  All have the same boiling point. 
A) 
  
B) 
  
C) 
  
D)  All have the same boiling point.

Question 17

How many moles of Na2CO3 are needed to react with 750 mL of 0.250 M H2SO4 solution?
Na2CO3 + H2SO4  $\rarr$Na2SO4 + CO2 + H2O

Accepted Answer

A)  3.00 * 103 
B)  0.333 
C)  1.33 
D)  0.188 
A)  3.00 * 103 
B)  0.333 
C)  1.33 
D)  0.188

Question 18

One test to determine if a mixture is a true solution or a colloid is ____.

Accepted Answer

A)  physical state of the mixture 
B)  boiling point elevation 
C)  light scattering 
D)  color 
A)  physical state of the mixture 
B)  boiling point elevation 
C)  light scattering 
D)  color

Question 19

Which of the following pairs can produce a homogeneous mixture?

Accepted Answer

A)  water and sand 
B)  oil and vinegar 
C)  vinegar and glucose 
D)  calcium carbonate and water 
A)  water and sand 
B)  oil and vinegar 
C)  vinegar and glucose 
D)  calcium carbonate and water

Question 20

A solution is prepared at 75 °C by dissolving 50.0 g of A in 100 g of water.Which of the following correctly classifies this solution based on the solubility chart for A given below?

Accepted Answer

A)  saturated 
B)  unsaturated 
C)  supersaturated 
D)  immiscible 
A)  saturated 
B)  unsaturated 
C)  supersaturated 
D)  immiscible

Exam 7: Solutions and Colloids

When making some iced tea,you find that you can dissolve 100 grams of table sugar in a liter of tea at 20 oC.Based on this,what did you learn?

Citric acid,a natural food preservative,accounts for the tartness of citrus fruits.It is shown below.About 730 g of this material can be dissolved in water,making a liter of solution.However,only about 1.5% of it dissociates.As such,it would be considered a _____.

A solution is prepared by dissolving 4.66 g of KCl in enough distilled water to give 250 mL of solution.KCl is a strong electrolyte.How will the freezing point of the solution be different from that of pure water? (Note: Kf for water is 1.86°C/M. )

Colloids are considered to be homogenous mixtures.

What volume of ethyl alcohol is contained in 35 mL (1 oz. )of 86 proof liquor,which is 43% (v/v)alcohol?

The ability to see the scattering of light when passed through a colloid is known as

Oil should be a good solvent for polar compounds.

A colligative property

A mixture of sand and water would be an example of a colloidal suspension.

The boiling point of a solution of sugar water is

Weight-volume percentage solutions must be made in 100 mL increments.

You have a patient who is suffering from the "bends".What gas is in excess in the blood?

Which compound is most soluble in a polar solvent?

There is a 12 M aqueous HCl solution in the stock room,but a 6 M solution is required for an experiment.Doubling the volume of a 12 M sample with water will produce a 6 M solution.

The spores from many molds produce an allergic reaction in many individuals.If mold spores in the air were to be considered a colloid,which technique would remove the spores best from a functioning air conditioner duct?

Which of the following correctly arranges 1.00 M solutions of the strong electrolytes in order of increasing boiling point (lowest to highest)?

How many moles of Na2CO3 are needed to react with 750 mL of 0.250 M H2SO4 solution? Na2CO3 + H2SO4 →\rarr→ Na2SO4 + CO2 + H2O

One test to determine if a mixture is a true solution or a colloid is ____.

Which of the following pairs can produce a homogeneous mixture?

A solution is prepared at 75 °C by dissolving 50.0 g of A in 100 g of water.Which of the following correctly classifies this solution based on the solubility chart for A given below?

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Electronic Structure and the Periodic Law

Forces Between Particles

Chemical Reactions

The States of Matter

Reaction Rates and Equilibrium

Acids,bases,and Salts

Radioactivity and Nuclear Processes

Organic Compounds: Alkanes

Unsaturated Hydrocarbons

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When making some iced tea,you find that you can dissolve 100 grams of table sugar in a liter of tea at 20 ^oC.Based on this,what did you learn?

A solution is prepared by dissolving 4.66 g of KCl in enough distilled water to give 250 mL of solution.KCl is a strong electrolyte.How will the freezing point of the solution be different from that of pure water? (Note: K_f for water is 1.86°C/M. )

How many moles of Na₂CO₃ are needed to react with 750 mL of 0.250 M H₂SO₄ solution? Na₂CO₃ + H₂SO₄ $\rarr$ Na₂SO₄ + CO₂ + H₂O