Question 1

Which of the following is an intermediate in the citric acid cycle?

Accepted Answer

A)  glutaric acid 
B)  oxalic acid 
C)  succinic acid 
D)  valeric acid 
A)  glutaric acid 
B)  oxalic acid 
C)  succinic acid 
D)  valeric acid

Question 2

In a sample of a pure carboxylic acid, how many hydrogen bonds are formed between a pair of carboxylic acid molecules?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 3

What is the IUPAC name for the following carboxylic acid?

Accepted Answer

A)  3-carboxyhexane 
B)  2-ethylpentanoic acid 
C)  4-ethylpentanoic acid 
D)  2-propylbutanoic acid 
A)  3-carboxyhexane 
B)  2-ethylpentanoic acid 
C)  4-ethylpentanoic acid 
D)  2-propylbutanoic acid

Question 4

Which of the following compounds will be the weakest acid?

Accepted Answer

A)  bromoacetic acid 
B)  chloroacetic acid 
C)  fluoroacetic acid 
D)  iodoacetic acid 
A)  bromoacetic acid 
B)  chloroacetic acid 
C)  fluoroacetic acid 
D)  iodoacetic acid

Question 5

A certain carboxylic acid has a Ka of 2.7 × 10-5. What is the pH of a 0.10 M solution of this acid?

Accepted Answer

A)  4.57 
B)  5.57 
C)  2.78 
D)  2.28 
A)  4.57 
B)  5.57 
C)  2.78 
D)  2.28

Question 6

Soaps are most commonly fatty acid salts of which cation?

Accepted Answer

A)  calcium 
B)  iron 
C)  magnesium 
D)  sodium 
A)  calcium 
B)  iron 
C)  magnesium 
D)  sodium

Question 7

The sour taste of pickles and sauerkraut is due primarily to the presence of which acid?

Accepted Answer

A)  acetic acid 
B)  citric acid 
C)  lactic acid 
D)  oxalic acid 
A)  acetic acid 
B)  citric acid 
C)  lactic acid 
D)  oxalic acid

Question 8

A precipitate is formed when soaps are used in waters which contain which of the following cations?

Accepted Answer

A)  Ca2+ 
B)  K+ 
C)  either a and b 
D)  neither a nor b 
A)  Ca2+ 
B)  K+ 
C)  either a and b 
D)  neither a nor b

Question 9

Which of the following gives the correct order of health risk for the three types of fatty acids?

Accepted Answer

A)  trans > saturated > cis 
B)  trans > cis > saturated 
C)  cis > saturated > trans 
D)  cis > trans > saturated 
A)  trans > saturated > cis 
B)  trans > cis > saturated 
C)  cis > saturated > trans 
D)  cis > trans > saturated

Question 10

Which of the following is true of the sources of fatty acids?

Accepted Answer

A)  Both animals and plants are rich in saturated fatty acids. 
B)  Both animals and plants are rich in unsaturated fatty acids. 
C)  Animals are rich in saturated fatty acids and plants are rich in unsaturated fatty acids. 
D)  Plants are rich in saturated fatty acids and animals are rich in unsaturated fatty acids. 
A)  Both animals and plants are rich in saturated fatty acids. 
B)  Both animals and plants are rich in unsaturated fatty acids. 
C)  Animals are rich in saturated fatty acids and plants are rich in unsaturated fatty acids. 
D)  Plants are rich in saturated fatty acids and animals are rich in unsaturated fatty acids.

Question 11

A certain carboxylic acid has a Ka of 5.1 × 10-7. What is the ratio of the ratio of the deprotonated to the protonated form, respectively, at physiological pH of about 7.4? Assume the following general reaction. HA(aq) + H2O(l) → H3O+(aq) + A-(aq)

Accepted Answer

A)  13 : 1 
B)  1 :13 
C)  100 : 1 
D)  1 : 100 
A)  13 : 1 
B)  1 :13 
C)  100 : 1 
D)  1 : 100

Question 12

Which of the following is true of fatty acids?

Accepted Answer

A)  They are branched carboxylic acids containing 6 to 12 carbon atoms. 
B)  They are unbranched carboxylic acids containing 6 to 12 carbon atoms. 
C)  They are branched carboxylic acids containing 12 to 20 carbon atoms. 
D)  They are unbranched carboxylic acids containing 12 to 20 carbon atoms. 
A)  They are branched carboxylic acids containing 6 to 12 carbon atoms. 
B)  They are unbranched carboxylic acids containing 6 to 12 carbon atoms. 
C)  They are branched carboxylic acids containing 12 to 20 carbon atoms. 
D)  They are unbranched carboxylic acids containing 12 to 20 carbon atoms.

Question 13

In what form(s) will a carboxylic acid, RCOOH, be present if the pH of an aqueous solution is adjusted to be very much higher than the pKa of the acid?

Accepted Answer

A)  primarily as RCOOH (aq) 
B)  primarily as RCOO− (aq) 
C)  equal amounts of (a) and (b) 
D)  neither (a) nor (b) 
A)  primarily as RCOOH (aq) 
B)  primarily as RCOO− (aq) 
C)  equal amounts of (a) and (b) 
D)  neither (a) nor (b)

Question 14

How many carboxylic acids have the molecular formula C5H10O2?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 15

Which of the following is true of fatty acids?

Accepted Answer

A)  All fatty acids are liquids at room temperature. 
B)  All fatty acids are solids at room temperature. 
C)  All saturated fatty acids are liquids at room temperature. 
D)  All cis-unsaturated fatty acids are liquids at room temperature. 
A)  All fatty acids are liquids at room temperature. 
B)  All fatty acids are solids at room temperature. 
C)  All saturated fatty acids are liquids at room temperature. 
D)  All cis-unsaturated fatty acids are liquids at room temperature.

Exam 18: Carboxylic Acids

Which of the following is an intermediate in the citric acid cycle?

In a sample of a pure carboxylic acid, how many hydrogen bonds are formed between a pair of carboxylic acid molecules?

What is the IUPAC name for the following carboxylic acid?

Which of the following compounds will be the weakest acid?

A certain carboxylic acid has a Ka of 2.7 × 10-5. What is the pH of a 0.10 M solution of this acid?

Soaps are most commonly fatty acid salts of which cation?

The sour taste of pickles and sauerkraut is due primarily to the presence of which acid?

A precipitate is formed when soaps are used in waters which contain which of the following cations?

Which of the following gives the correct order of health risk for the three types of fatty acids?

Which of the following is true of the sources of fatty acids?

A certain carboxylic acid has a Ka of 5.1 × 10-7. What is the ratio of the ratio of the deprotonated to the protonated form, respectively, at physiological pH of about 7.4? Assume the following general reaction. HA(aq) + H2O(l) → H3O+(aq) + A-(aq)

Which of the following is true of fatty acids?

In what form(s) will a carboxylic acid, RCOOH, be present if the pH of an aqueous solution is adjusted to be very much higher than the pKa of the acid?

How many carboxylic acids have the molecular formula C5H10O2?

Which of the following is true of fatty acids?

Matter, Energy, and Measurement

Atoms

Chemical Bonds

Chemical Reactions

Gases, Liquids, and Solids

Solutions and Colloids

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 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

A certain carboxylic acid has a K_a of 2.7 × 10^-5. What is the pH of a 0.10 M solution of this acid?

A certain carboxylic acid has a K_a of 5.1 × 10^-7. What is the ratio of the ratio of the deprotonated to the protonated form, respectively, at physiological pH of about 7.4? Assume the following general reaction. HA(aq) + H₂O(l) → H₃O⁺(aq) + A^-(aq)

In what form(s) will a carboxylic acid, RCOOH, be present if the pH of an aqueous solution is adjusted to be very much higher than the pK_a of the acid?

How many carboxylic acids have the molecular formula C₅H₁₀O₂?