Question 1

If we know the solute and the molarity of a solution which other concentration unit can we readily determine without any other measurements?

Accepted Answer

A)  %(w/w) 
B)  %(w/v) 
C)  %(v/v) 
D)  all of these 
A)  %(w/w) 
B)  %(w/v) 
C)  %(v/v) 
D)  all of these

Question 2

Isotonic saline is 0.89% NaCl (w/v). Suppose you wanted to make 1.0 L of isotonic solution of KCl. What mass of KCl would you need?

Accepted Answer

A)  8.9 g 
B)  11 g 
C)  23 g 
D)  75 g 
A)  8.9 g 
B)  11 g 
C)  23 g 
D)  75 g

Question 3

Assuming that the volumes are additive, what volume of water must be added to 35.0 mL of 15.0%(w/v) KOH to make a solution which is 10.0%(w/v)?

Accepted Answer

A)  15.0 mL 
B)  17.5 mL 
C)  23.3 mL 
D)  52.5 mL 
A)  15.0 mL 
B)  17.5 mL 
C)  23.3 mL 
D)  52.5 mL

Question 4

How big is 1 nm?

Accepted Answer

A)  1 × 10-12 m 
B)  1 × 10-9 m 
C)  1 × 10-6 m 
D)  1 × 10-3 m 
A)  1 × 10-12 m 
B)  1 × 10-9 m 
C)  1 × 10-6 m 
D)  1 × 10-3 m

Question 5

If a solution is prepared by dissolving 7.7 g of lithium iodide, LiI, in enough water to make 400. mL of solution, what is the %(w/v) of LiI?

Accepted Answer

A)  0.96% 
B)  1.9% 
C)  3.9% 
D)  7.7% 
A)  0.96% 
B)  1.9% 
C)  3.9% 
D)  7.7%

Question 6

Which of the following is true when comparing a dialysis membrane with an osmotic semipermeable membrane?

Accepted Answer

A)  Both membranes allow solute particles to pass through. 
B)  The osmotic membrane has larger openings. 
C)  both a and b 
D)  neither a nor b 
A)  Both membranes allow solute particles to pass through. 
B)  The osmotic membrane has larger openings. 
C)  both a and b 
D)  neither a nor b

Question 7

Water is likely to be a poor solvent for which types of molecules?

Accepted Answer

A)  molecules which can form hydrogen bonds 
B)  nonpolar molecules 
C)  polar molecules 
D)  None, water is considered a universal solvent. 
A)  molecules which can form hydrogen bonds 
B)  nonpolar molecules 
C)  polar molecules 
D)  None, water is considered a universal solvent.

Question 8

Which of the following is true regarding the solubility of liquids and solids?

Accepted Answer

A)  Pressure has virtually no effect on the solubility of liquids or solids. 
B)  Solubility always decreases as pressure decreases. 
C)  Solubility always increases as pressure decreases. 
D)  Solubility usually decreases as pressure decreases. 
A)  Pressure has virtually no effect on the solubility of liquids or solids. 
B)  Solubility always decreases as pressure decreases. 
C)  Solubility always increases as pressure decreases. 
D)  Solubility usually decreases as pressure decreases.

Question 9

Which of the following is an example of a colloid in which a liquid is dispersed in a liquid?

Accepted Answer

A)  butter 
B)  marshmallows 
C)  mayonnaise 
D)  whipped cream 
A)  butter 
B)  marshmallows 
C)  mayonnaise 
D)  whipped cream

Question 10

Water is generally a good solvent for which of the following types of compounds?

Accepted Answer

A)  nonpolar compounds 
B)  polar compounds 
C)  both a and b 
D)  neither a nor b 
A)  nonpolar compounds 
B)  polar compounds 
C)  both a and b 
D)  neither a nor b

Question 11

Even if we know the solute, molarity and density of a solution, which of the following concentration units cannot be readily determined without any other measurements?

Accepted Answer

A)  %(w/w) 
B)  %(w/v) 
C)  %(v/v) 
D)  all of these 
A)  %(w/w) 
B)  %(w/v) 
C)  %(v/v) 
D)  all of these

Question 12

Appreciable amounts of sugar can be dissolved in which of the following solvents?

Accepted Answer

A)  benzene (C6H6) 
B)  water 
C)  both a and b 
D)  neither a nor b 
A)  benzene (C6H6) 
B)  water 
C)  both a and b 
D)  neither a nor b

Question 13

Which of the following solutions is isotonic with a 0.15 M NaCl solution?

Accepted Answer

A)  0.15 M glucose, C6H12O6 
B)  0.30 M glucose, C6H12O6 
C)  0.10 M aluminum chloride, AlCl3 
D)  none of these 
A)  0.15 M glucose, C6H12O6 
B)  0.30 M glucose, C6H12O6 
C)  0.10 M aluminum chloride, AlCl3 
D)  none of these

Question 14

Which of the following will have the lowest freezing point?

Accepted Answer

A)  0.1 M ethylene glycol, C2H6O2 
B)  0.1 M glucose, C6H12O6 
C)  0.1 M sucrose, C12H22O11 
D)  All have the same freezing point. 
A)  0.1 M ethylene glycol, C2H6O2 
B)  0.1 M glucose, C6H12O6 
C)  0.1 M sucrose, C12H22O11 
D)  All have the same freezing point.

Question 15

In hemodialysis the osmotic pressure of the dialysis solution is adjusted to prevent the loss of which of the following from blood?

Accepted Answer

A)  Na+ 
B)  glucose 
C)  both a and b 
D)  neither a nor b 
A)  Na+ 
B)  glucose 
C)  both a and b 
D)  neither a nor b

Question 16

Which must we do when preparing a solution of specific molarity?

Accepted Answer

A)  Carefully weigh the solute, carefully weigh the solvent. 
B)  Carefully weigh the solute, carefully measure the volume of solvent. 
C)  Carefully weigh the solute, fill the volumetric flask to the mark. 
D)  None of the above is the correct procedure. 
A)  Carefully weigh the solute, carefully weigh the solvent. 
B)  Carefully weigh the solute, carefully measure the volume of solvent. 
C)  Carefully weigh the solute, fill the volumetric flask to the mark. 
D)  None of the above is the correct procedure.

Question 17

Which of the following techniques can be used to decrease the stability of an aqueous colloidal dispersion?

Accepted Answer

A)  addition of an electrolyte 
B)  dilution of the system by addition of water 
C)  both a and b 
D)  neither a nor b 
A)  addition of an electrolyte 
B)  dilution of the system by addition of water 
C)  both a and b 
D)  neither a nor b

Question 18

Which of the following is associated with colloidal particles?

Accepted Answer

A)  They are smaller than 1 nm. 
B)  They scatter light. 
C)  both a and b 
D)  neither a nor b 
A)  They are smaller than 1 nm. 
B)  They scatter light. 
C)  both a and b 
D)  neither a nor b

Question 19

In a solution of a solid in a liquid, the liquid is called which of the following?

Accepted Answer

A)  concentrate 
B)  dissolver 
C)  solute 
D)  solvent 
A)  concentrate 
B)  dissolver 
C)  solute 
D)  solvent

Question 20

The following shows the beginning of the laboratory preparation of an aqueous solution of the hypothetical compound AB (150.5 g/mol).  
-If the volume of the volumetric flask had been 500. mL instead of 100. mL and the amount of AB had been 25.5 g, how would the molarity of the resulting have been affected?

Accepted Answer

A)  increased by a factor of 5 
B)  reduced by a factor of 5 
C)  increased by a factor of 10 
D)  decreased by a factor of 10 
E)  It would be unchanged. 
A)  increased by a factor of 5 
B)  reduced by a factor of 5 
C)  increased by a factor of 10 
D)  decreased by a factor of 10 
E)  It would be unchanged.

Exam 6: Solutions and Colloids

If we know the solute and the molarity of a solution which other concentration unit can we readily determine without any other measurements?

Isotonic saline is 0.89% NaCl (w/v). Suppose you wanted to make 1.0 L of isotonic solution of KCl. What mass of KCl would you need?

Assuming that the volumes are additive, what volume of water must be added to 35.0 mL of 15.0%(w/v) KOH to make a solution which is 10.0%(w/v)?

How big is 1 nm?

If a solution is prepared by dissolving 7.7 g of lithium iodide, LiI, in enough water to make 400. mL of solution, what is the %(w/v) of LiI?

Which of the following is true when comparing a dialysis membrane with an osmotic semipermeable membrane?

Water is likely to be a poor solvent for which types of molecules?

Which of the following is true regarding the solubility of liquids and solids?

Which of the following is an example of a colloid in which a liquid is dispersed in a liquid?

Water is generally a good solvent for which of the following types of compounds?

Even if we know the solute, molarity and density of a solution, which of the following concentration units cannot be readily determined without any other measurements?

Appreciable amounts of sugar can be dissolved in which of the following solvents?

Which of the following solutions is isotonic with a 0.15 M NaCl solution?

Which of the following will have the lowest freezing point?

In hemodialysis the osmotic pressure of the dialysis solution is adjusted to prevent the loss of which of the following from blood?

Which must we do when preparing a solution of specific molarity?

Which of the following techniques can be used to decrease the stability of an aqueous colloidal dispersion?

Which of the following is associated with colloidal particles?

In a solution of a solid in a liquid, the liquid is called which of the following?

Matter, Energy, and Measurement

Atoms

Chemical Bonds

Chemical Reactions

Gases, Liquids, and Solids

Reaction Rates and Chemical Equilibrium

Acids and Bases

Nuclear Chemistry

Organic Chemistry

Alkanes

Alkenes and Alkynes

Benzene and Its Derivatives

Alcohols, Ethers, and Thiols

Chirality: the Handedness of Molecules

Amines

Aldehydes and Ketones

Carboxylic Acids

Carboxylic Anhydrides, Esters, and Amides

Carbohydrates

Lipids

Proteins

Enzymes

Chemical Communications: Neurotransmitters and Hormones

Nucleotides, Nucleic Acids, and Heredity

Gene Expression and Protein Synthesis

Bioenergetics: How the Body Converts Food to Energy

Specific Catabolic Pathways: Carbohydrate, Lipid, and Protein Metabolism

Biosynthetic Pathways

Nutrition

Immunochemistry

Body Fluids

Filters