Question 1

Why might a high-formula-mass alcohol be insoluble in water?

Accepted Answer

A) A high formula mass alcohol would be too attracted to itself to be soluble in water. 
B) The bulk of a high formula mass alcohol likely consists of nonpolar hydrocarbons. 
C) Such an alcohol would likely be in a solid phase. 
D) In order for two substance to be soluble in each other their molecules need to be of comparable mass. 
A) A high formula mass alcohol would be too attracted to itself to be soluble in water. 
B) The bulk of a high formula mass alcohol likely consists of nonpolar hydrocarbons. 
C) Such an alcohol would likely be in a solid phase. 
D) In order for two substance to be soluble in each other their molecules need to be of comparable mass. B

Question 2

In a fractionating tower, the crude oil vapors pass from a pipe still into the column. Tar and lubricating stock are the first components to be pulled off at the bottom. Nearer the top kerosene is pulled off followed by gasoline and finally natural gas at the very top. From this information, which has a higher boiling point, gasoline or kerosine?

Accepted Answer

A) Gasoline has the higher boiling point. 
B) Kerosene has the higher boiling point. 
C) Their boiling points are the same, but kerosene has the greater density. 
D) Fractional distillation components are pulled off based on molecular weight, so it is not possible to know which has the higher boiling point from the information given. 
A) Gasoline has the higher boiling point. 
B) Kerosene has the higher boiling point. 
C) Their boiling points are the same, but kerosene has the greater density. 
D) Fractional distillation components are pulled off based on molecular weight, so it is not possible to know which has the higher boiling point from the information given. B

Question 3

The temperatures in a fractionating tower at an oil refinery are important, but so are the pressures. Where might the pressure in a fractional distillation tower be greatest, at the bottom or at the top? Defend your answer.

Accepted Answer

A) The pressure is greatest at the bottom because the higher temperature means a greater number of vaporized molecules. 
B) The pressure is greatest at the top because the higher temperature means a greater number of vaporized molecules. 
C) The pressure is greatest at the bottom because the lower temperature means a greater number of vaporized molecules. 
D) The pressure is greatest at the top because the lower temperature means a greater number of vaporized molecules. 
A) The pressure is greatest at the bottom because the higher temperature means a greater number of vaporized molecules. 
B) The pressure is greatest at the top because the higher temperature means a greater number of vaporized molecules. 
C) The pressure is greatest at the bottom because the lower temperature means a greater number of vaporized molecules. 
D) The pressure is greatest at the top because the lower temperature means a greater number of vaporized molecules. A

Question 4

Where would you expect to isolate molecules in a fractionating tower that have a large number of interatomic forces?

Accepted Answer

A) near the bottom 
B) near the top 
C) near the middle 
D) Fractional distillation takes advantage of molecular weight. 
E) Fractional distillation takes advantage of the number of isomers. 
A) near the bottom 
B) near the top 
C) near the middle 
D) Fractional distillation takes advantage of molecular weight. 
E) Fractional distillation takes advantage of the number of isomers.

Question 5

Which of the above molecules is an aldehyde?

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) none of the above 
A) a 
B) b 
C) c 
D) d 
E) none of the above

Question 6

In water, does the molecule lysergic acid diethylamide act as an acid, a base, neither or both?

Accepted Answer

A) acid 
B) base 
C) neither an acid or a base 
D) both as an acid and as a base 
A) acid 
B) base 
C) neither an acid or a base 
D) both as an acid and as a base

Question 7

Heteroatoms make a difference in the physical and chemical properties of an organic molecule because

Accepted Answer

A) they add extra mass to the hydrocarbon structure. 
B) each heteroatom has its own characteristic chemistry. 
C) they can enhance the polarity of the organic molecule. 
D) all of the above 
A) they add extra mass to the hydrocarbon structure. 
B) each heteroatom has its own characteristic chemistry. 
C) they can enhance the polarity of the organic molecule. 
D) all of the above

Question 8

Which of the monomers below would be used to make the following polymer?

Accepted Answer

A) HC   CH-CH3 
B) H2C-CH2-CH3 
C) HC   CH-CH-C   CH-CH3 
D) H2C   CH2 
E) none of the above 
A) HC   CH-CH3 
B) H2C-CH2-CH3 
C) HC   CH-CH-C   CH-CH3 
D) H2C   CH2 
E) none of the above

Question 9

How are monomers and polymers related?

Accepted Answer

A) A monomer is a small, repeating unit that makes up a polymer. 
B) A monomer is one strand of a polymer. 
C) A monomer is made when you condense a polymer through polymerization. 
D) A polymer is chemically identical to a monomer, only larger. 
E) none of the above 
A) A monomer is a small, repeating unit that makes up a polymer. 
B) A monomer is one strand of a polymer. 
C) A monomer is made when you condense a polymer through polymerization. 
D) A polymer is chemically identical to a monomer, only larger. 
E) none of the above

Question 10

How does fractional distillation work?

Accepted Answer

A) It takes advantage of the different boiling points of molecules to separate them. 
B) It takes advantage of the different weight of molecules to separate them. 
C) It uses the fraction of carbon in the isomers to separate the molecules. 
D) It takes advantage of the different melting points to separate molecules. 
E) none of the above 
A) It takes advantage of the different boiling points of molecules to separate them. 
B) It takes advantage of the different weight of molecules to separate them. 
C) It uses the fraction of carbon in the isomers to separate the molecules. 
D) It takes advantage of the different melting points to separate molecules. 
E) none of the above

Question 11

Which of the following is the hallmark of a saturated hydrocarbon?

Accepted Answer

A) a hydrocarbon where carbon has only a single bond to two or more other carbons 
B) a hydrocarbon that is completely dissolved in water 
C) a hydrocarbon where carbon has multiple bonds to one or more other carbons 
D) any molecule that is completely dissolved in a hydrocarbon solvent 
E) none of the above 
A) a hydrocarbon where carbon has only a single bond to two or more other carbons 
B) a hydrocarbon that is completely dissolved in water 
C) a hydrocarbon where carbon has multiple bonds to one or more other carbons 
D) any molecule that is completely dissolved in a hydrocarbon solvent 
E) none of the above

Question 12

What type of polymer would be best to use in the manufacture of stain-resistant carpets?

Accepted Answer

A) cellulose 
B) nylon 
C) Melmac 
D) Teflon 
A) cellulose 
B) nylon 
C) Melmac 
D) Teflon

Question 13

Which of the above molecules would most likely have a strong, distinct smell?

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) a or d 
A) a 
B) b 
C) c 
D) d 
E) a or d

Question 14

Which of the following stick structures could describe pentane (C5H12)?

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) none of the above 
A) a 
B) b 
C) c 
D) d 
E) none of the above

Question 15

What is the main difference between High Density PolyEtyhlene (HDPE)and Low Density PolyEthylene(LDPE)?

Accepted Answer

A) HDPE has very long chains packed close together; LDPE has long chains that are branched and do not pack together well. 
B) One is made from high density ethylene, the other from low density ethylene. 
C) HDPE has very long chains packed close together; LDPE has short chains that do not pack together well. 
D) HDPE is more useful than LDPE. 
E) LDPE is more useful than HDPE. 
A) HDPE has very long chains packed close together; LDPE has long chains that are branched and do not pack together well. 
B) One is made from high density ethylene, the other from low density ethylene. 
C) HDPE has very long chains packed close together; LDPE has short chains that do not pack together well. 
D) HDPE is more useful than LDPE. 
E) LDPE is more useful than HDPE.

Question 16

Which region (a-b-c)is a phenolic functional group?

Accepted Answer

A) a 
B) b 
C) c 
D) b or c 
E) b and c 
A) a 
B) b 
C) c 
D) b or c 
E) b and c

Question 17

Which two of these four structures are of the same structural isomer?

Accepted Answer

A) upper right and lower left 
B) upper left and lower right 
C) lower left and upper right 
D) lower right and upper right 
A) upper right and lower left 
B) upper left and lower right 
C) lower left and upper right 
D) lower right and upper right

Question 18

Which of the following two stick structures are structural isomers?

Accepted Answer

A) a and b 
B) a and c 
C) b and c 
D) b and d 
E) none of the above 
A) a and b 
B) a and c 
C) b and c 
D) b and d 
E) none of the above

Question 19

Which of the following molecules could be a different conformation of the underlined molecule below?

Accepted Answer

A) a 
B) b 
C) c 
D) all of the above 
E) none of the above 
A) a 
B) b 
C) c 
D) all of the above 
E) none of the above

Question 20

Which of the following molecules contains a phenol?

Accepted Answer

A) a 
B) b 
C) c 
D) b and c 
E) all of them 
A) a 
B) b 
C) c 
D) b and c 
E) all of them

Exam 19: Organic Compounds

Why might a high-formula-mass alcohol be insoluble in water?

The temperatures in a fractionating tower at an oil refinery are important, but so are the pressures. Where might the pressure in a fractional distillation tower be greatest, at the bottom or at the top? Defend your answer.

Where would you expect to isolate molecules in a fractionating tower that have a large number of interatomic forces?

Which of the above molecules is an aldehyde?

In water, does the molecule lysergic acid diethylamide act as an acid, a base, neither or both?

Heteroatoms make a difference in the physical and chemical properties of an organic molecule because

Which of the monomers below would be used to make the following polymer?

How are monomers and polymers related?

How does fractional distillation work?

Which of the following is the hallmark of a saturated hydrocarbon?

What type of polymer would be best to use in the manufacture of stain-resistant carpets?

Which of the above molecules would most likely have a strong, distinct smell?

Which of the following stick structures could describe pentane (C5H12)?

What is the main difference between High Density PolyEtyhlene (HDPE)and Low Density PolyEthylene(LDPE)?

Which region (a-b-c)is a phenolic functional group?

Which two of these four structures are of the same structural isomer?

Which of the following two stick structures are structural isomers?

Which of the following molecules could be a different conformation of the underlined molecule below?

Which of the following molecules contains a phenol?

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Timereading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: the Nature of Science

Filters

Which of the following stick structures could describe pentane (C₅H₁₂)?