Question 1

Which of the following tend to stabilize colloids and prevent suspended particles from settling?

Accepted Answer

A) presence of emulsifying agents 
B) absorption of charges by colloid particles 
C) absence of ionic salts 
D) more than one response is correct 
A) presence of emulsifying agents 
B) absorption of charges by colloid particles 
C) absence of ionic salts 
D) more than one response is correct

Question 2

When preparing an aqueous solution of a salt, one must always be able to observe some undissolved material to be sure that it is saturated.

Accepted Answer

A) True 
 B)False

Question 3

The solubility of gases in water increases with increasing temperature.

Accepted Answer

A) True 
 B)False

Question 4

Match between columns
                        Premises: Milk

Accepted Answer

The Answer of Solid foam and Sol and Foam and is...

Question 5

Match between columns
                        Premises:  Ink

Accepted Answer

The Answer of Sol and Solid foam and Aerosol and is...

Question 6

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 7

Attractive forces between solute and solvent molecules are an important factor in solution formation.

Accepted Answer

A) True 
 B)False

Question 8

All ionic compounds are soluble in water.

Accepted Answer

A) True 
 B)False

Question 9

When a patient's blood electrolyte levels are evaluated, sodium, chloride and bicarbonate ions are commonly measured and the difference in the total positive and negative charges calculated. This difference is called the

Accepted Answer

A) ionic ratio. 
B) isoelectric point. 
C) electromotive constant. 
D) anion gap. 
A) ionic ratio. 
B) isoelectric point. 
C) electromotive constant. 
D) anion gap.

Question 10

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 11

The solubility of a substance can be measured in grams substance dissolved per liter of water. This is the same as expressing solubility in moles per liter.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following pass through both osmotic and dialysis membranes?

Accepted Answer

A) solvent molecules 
B) large molecules 
C) cations 
D) anions 
A) solvent molecules 
B) large molecules 
C) cations 
D) anions

Question 13

The cleaning action of soaps and detergents is attributable to

Accepted Answer

A) their ionic character. 
B) the long hydrocarbon tail in their structure. 
C) their ability to dissociate into ions. 
D) all of these 
A) their ionic character. 
B) the long hydrocarbon tail in their structure. 
C) their ability to dissociate into ions. 
D) all of these

Question 14

How many moles of Na2CO3 are needed to react with 750 mL of 0.250 M H2SO4 solution? Na2CO3 + H2SO4 → 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 15

Light scattering is an effective way to distinguish between true solutions and colloidal dispersions.

Accepted Answer

A) True 
 B)False

Question 16

The following equation can be used when C represents either a M or %(w\w)concentration. 
 CcVc = CdVd

Accepted Answer

A) True 
 B)False

Question 17

You discover that your roommate has left a half-full bottle of cola on the kitchen counter without replacing the cap - AGAIN!. Not surprisingly, the cola is now flat (all carbonation is gone).  Why did this happen?

Accepted Answer

A) The solubility of the carbon dioxide gas in the cola has decreased due to it being left at a lower pressure. 
B) Warm bottles of cola will lose their carbonation faster than cold ones, even if the lid had been left on. 
C) Oxygen in the atmosphere reacts with the cola, eliminating the carbonation. 
D) The solubility of the carbon dioxide gas diffuses through the wall of the bottle. 
A) The solubility of the carbon dioxide gas in the cola has decreased due to it being left at a lower pressure. 
B) Warm bottles of cola will lose their carbonation faster than cold ones, even if the lid had been left on. 
C) Oxygen in the atmosphere reacts with the cola, eliminating the carbonation. 
D) The solubility of the carbon dioxide gas diffuses through the wall of the bottle.

Question 18

In the colloid known as mayonnaise, the dispersed phase is _____ .

Accepted Answer

A) a gas 
B) a liquid 
C) a solid 
D) unknown 
A) a gas 
B) a liquid 
C) a solid 
D) unknown

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

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

Exam 7: Solutions and Colloids

Which of the following tend to stabilize colloids and prevent suspended particles from settling?

When preparing an aqueous solution of a salt, one must always be able to observe some undissolved material to be sure that it is saturated.

The solubility of gases in water increases with increasing temperature.

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

Attractive forces between solute and solvent molecules are an important factor in solution formation.

All ionic compounds are soluble in water.

When a patient's blood electrolyte levels are evaluated, sodium, chloride and bicarbonate ions are commonly measured and the difference in the total positive and negative charges calculated. This difference is called the

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

The solubility of a substance can be measured in grams substance dissolved per liter of water. This is the same as expressing solubility in moles per liter.

Which of the following pass through both osmotic and dialysis membranes?

The cleaning action of soaps and detergents is attributable to

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

Light scattering is an effective way to distinguish between true solutions and colloidal dispersions.

The following equation can be used when C represents either a M or %(w\w)concentration. CcVc = CdVd

You discover that your roommate has left a half-full bottle of cola on the kitchen counter without replacing the cap - AGAIN!. Not surprisingly, the cola is now flat (all carbonation is gone). Why did this happen?

In the colloid known as mayonnaise, the dispersed phase is _____ .

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

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 _____.

Matter, Measurements, and Calculations

Atoms and Molecules

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

Alcohols, Phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Esters

Amines and Amides

Carbohydrates

Lipids

Proteins

Enzymes

Nucleic Acids and Protein Synthesis

Nutrition and Energy for Life

Carbohydrate Metabolism

Lipid and Amino Acid Metabolism

Body Fluids

Filters

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

The following equation can be used when C represents either a M or %(w\w)concentration. C_cV_c = C_dV_d