Question 1

In reverse osmosis of sea water to produce drinking water, approximately what is the typical residual concentration of salt in the drinking water which is produced?

Accepted Answer

A)  0 
B)  40 ppm 
C)  400 ppm 
D)  4000 ppm 
A)  0 
B)  40 ppm 
C)  400 ppm 
D)  4000 ppm

Question 2

Consider the following image of a separatory funnel.  
-Which of the following correctly describes the contents of the funnel?

Accepted Answer

A)  The two liquids are insoluble in each other. 
B)  The two liquids are miscible. 
C)  The mixture is homogeneous. 
D)  All of these are correct. 
A)  The two liquids are insoluble in each other. 
B)  The two liquids are miscible. 
C)  The mixture is homogeneous. 
D)  All of these are correct.

Question 3

Assuming that the solvent is the same in all cases, which of the following has the largest particles?

Accepted Answer

A)  a colloid 
B)  a suspension 
C)  a solution 
D)  the pure solvent 
A)  a colloid 
B)  a suspension 
C)  a solution 
D)  the pure solvent

Question 4

The following shows the beginning of the laboratory preparation of an aqueous solution of the hypothetical compound AB (150.5 g/mol).  
-When the solution is prepared which of the following correctly describes this process?

Accepted Answer

A)  5.10 g of AB is dissolved in 100.0 mL of water and the solution is thoroughly mixed. 
B)  5.10 g of AB is dissolved in water and enough water is added to produce 100.0 mL of solution. 
C)  5.10 g of AB is dissolved in 94.90 mL of water and the solution is thoroughly mixed. 
D)  5.10 g of AB is dissolved in water and enough water is added to product 105.0 mL of solution. 
A)  5.10 g of AB is dissolved in 100.0 mL of water and the solution is thoroughly mixed. 
B)  5.10 g of AB is dissolved in water and enough water is added to produce 100.0 mL of solution. 
C)  5.10 g of AB is dissolved in 94.90 mL of water and the solution is thoroughly mixed. 
D)  5.10 g of AB is dissolved in water and enough water is added to product 105.0 mL of solution.

Question 5

Which piece of glassware do we need to accurately measure the total volume of a solution of a specific molarity?

Accepted Answer

A)  a graduated cylinder 
B)  a volumetric flask 
C)  a volumetric pipet 
D)  Any of these would be appropriate. 
A)  a graduated cylinder 
B)  a volumetric flask 
C)  a volumetric pipet 
D)  Any of these would be appropriate.

Question 6

Saline solutions (NaCl in water) used to deliver intravenous drugs are 0.89%(w/v). What mass of NaCl is found in 500. mL of such a solution?

Accepted Answer

A)  0.45 g 
B)  0.89 g 
C)  4.5 g 
D)  8.9 g 
A)  0.45 g 
B)  0.89 g 
C)  4.5 g 
D)  8.9 g

Question 7

The unit 1 ppm is equivalent to which of the following?

Accepted Answer

A)  1000 ppb 
B)  0.0001% 
C)  both a and b 
D)  neither a nor b 
A)  1000 ppb 
B)  0.0001% 
C)  both a and b 
D)  neither a nor b

Question 8

Consider the following image of a separatory funnel.  
-If the liquid on the bottom is water, what might be the identity of the liquid on the top?

Accepted Answer

A)  C5H12 only 
B)  CH3OH only 
C)  C6H6 only 
D)  a or c 
E)  a, b or c 
A)  C5H12 only 
B)  CH3OH only 
C)  C6H6 only 
D)  a or c 
E)  a, b or c

Question 9

A typical sample of brass is 67% (w/w) copper and 33% (w/w) zinc, and has a density of 8.40 g/mL. What is the molarity of this solution?

Accepted Answer

A)  33 M 
B)  42 M 
C)  88 M 
D)  67 M 
A)  33 M 
B)  42 M 
C)  88 M 
D)  67 M

Question 10

Which of the following aqueous solutions of Na2SO4 is hypertonic with respect to a 0.15 M NaCl solution?

Accepted Answer

A)  0.05 M 
B)  0.10 M 
C)  0.15 M 
D)  none of these 
A)  0.05 M 
B)  0.10 M 
C)  0.15 M 
D)  none of these

Question 11

Which of the following is true of electrolytes?

Accepted Answer

A)  All electrolytes have water as a solvent. 
B)  All electrolytes contain equal numbers of cations and anions. 
C)  both a and b 
D)  neither a nor b 
A)  All electrolytes have water as a solvent. 
B)  All electrolytes contain equal numbers of cations and anions. 
C)  both a and b 
D)  neither a nor b

Question 12

A glycine solution is 2.50%(w/w). How much glycine is there in a sample which has a mass of 250. g?

Accepted Answer

A)  1.25 g 
B)  5.00 g 
C)  6.25 g 
D)  12.5 g 
A)  1.25 g 
B)  5.00 g 
C)  6.25 g 
D)  12.5 g

Question 13

Which of the following will have the highest electrical conductivity?

Accepted Answer

A)  0.1 M NaCl 
B)  0.2 M NaCl 
C)  0.3 M CH3COOH 
D)  0.4 M CH3COOH 
A)  0.1 M NaCl 
B)  0.2 M NaCl 
C)  0.3 M CH3COOH 
D)  0.4 M CH3COOH

Exam 6: Solutions and Colloids

In reverse osmosis of sea water to produce drinking water, approximately what is the typical residual concentration of salt in the drinking water which is produced?

Consider the following image of a separatory funnel. -Which of the following correctly describes the contents of the funnel?

Assuming that the solvent is the same in all cases, which of the following has the largest particles?

The following shows the beginning of the laboratory preparation of an aqueous solution of the hypothetical compound AB (150.5 g/mol). -When the solution is prepared which of the following correctly describes this process?

Which piece of glassware do we need to accurately measure the total volume of a solution of a specific molarity?

Saline solutions (NaCl in water) used to deliver intravenous drugs are 0.89%(w/v). What mass of NaCl is found in 500. mL of such a solution?

The unit 1 ppm is equivalent to which of the following?

Consider the following image of a separatory funnel. -If the liquid on the bottom is water, what might be the identity of the liquid on the top?

A typical sample of brass is 67% (w/w) copper and 33% (w/w) zinc, and has a density of 8.40 g/mL. What is the molarity of this solution?

Which of the following aqueous solutions of Na2SO4 is hypertonic with respect to a 0.15 M NaCl solution?

Which of the following is true of electrolytes?

A glycine solution is 2.50%(w/w). How much glycine is there in a sample which has a mass of 250. g?

Which of the following will have the highest electrical conductivity?

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

Which of the following aqueous solutions of Na₂SO₄ is hypertonic with respect to a 0.15 M NaCl solution?