Question 1

Which of the following is present in buffers that do not readily permeate cell membranes?

Accepted Answer

A)  only anions 
B)  only cations 
C)  only neutral molecules 
D)  zwitterions 
A)  only anions 
B)  only cations 
C)  only neutral molecules 
D)  zwitterions

Question 2

Which of the following acids has long been used as a test for proteins?

Accepted Answer

A)  acetic 
B)  boric 
C)  nitric 
D)  sulfuric 
A)  acetic 
B)  boric 
C)  nitric 
D)  sulfuric

Question 3

Which of the following ions does a base produce according to the original Arrhenius definition of a base?

Accepted Answer

A)  H+ 
B)  OH− 
C)  H2O 
D)  none of these 
A)  H+ 
B)  OH− 
C)  H2O 
D)  none of these

Question 4

Which of the following can be characterized as a strong base?

Accepted Answer

A)  LiOH 
B)  KOH 
C)  both LiOH and KOH 
D)  neither LiOH or KOH 
A)  LiOH 
B)  KOH 
C)  both LiOH and KOH 
D)  neither LiOH or KOH

Question 5

Which of the following is the conjugate acid of water?

Accepted Answer

A)  HCl 
B)  H3O+ 
C)  NH4+ 
D)  OH− 
A)  HCl 
B)  H3O+ 
C)  NH4+ 
D)  OH−

Question 6

Hydrocyanic acid, HCN, is a weak acid. Which of the following is the correct expression for the Ka of hydrocyanic acid?

Accepted Answer

A)  [H3O+][HCN]/[CN−] 
B)  [H3O+][CN−]/[HCN] 
C)  [HCN]/[ H3O+][CN−] 
D)  [HCN][CN−]/[ H3O+] 
A)  [H3O+][HCN]/[CN−] 
B)  [H3O+][CN−]/[HCN] 
C)  [HCN]/[ H3O+][CN−] 
D)  [HCN][CN−]/[ H3O+]

Question 7

Which of the following buffers will have the lowest pH?

Accepted Answer

A)  A solution containing 0.20 M HC2H3O2 and 0.20 M NaC2H3O2 will have the lowest pH. 
B)  A solution containing 0.25 M HC2H3O2 and 0.15 M NaC2H3O2 will have the lowest pH. 
C)  A solution containing 0.15 M HC2H3O2 and 0.25 M NaC2H3O2 will have the lowest pH. 
D)  They all will have the same pH. 
A)  A solution containing 0.20 M HC2H3O2 and 0.20 M NaC2H3O2 will have the lowest pH. 
B)  A solution containing 0.25 M HC2H3O2 and 0.15 M NaC2H3O2 will have the lowest pH. 
C)  A solution containing 0.15 M HC2H3O2 and 0.25 M NaC2H3O2 will have the lowest pH. 
D)  They all will have the same pH.

Question 8

Which of the following is the formula used to calculate the pH of a solution?

Accepted Answer

A)  log[H3O+] 
B)  log[H3O+]. 
C)  -log[H3O+] 
D)  none of these 
A)  log[H3O+] 
B)  log[H3O+]. 
C)  -log[H3O+] 
D)  none of these

Question 9

Which of the following solutions can function as a buffer?

Accepted Answer

A)  a solution containing HC2H3O2 and NaC2H3O2 
B)  a solution containing H2CO3 and NaHCO3 
C)  a solution containing NH3 and NH4Cl 
D)  all of these 
A)  a solution containing HC2H3O2 and NaC2H3O2 
B)  a solution containing H2CO3 and NaHCO3 
C)  a solution containing NH3 and NH4Cl 
D)  all of these

Question 10

Sulfites, salts of the anion SO32−, are found in wines as preservatives. The acid associated with the sulfite ion is H2SO3. What is the name of H2SO3?

Accepted Answer

A)  hydrosulfuric acid 
B)  hydrosulfurous acid 
C)  sulfuric acid 
D)  sulfurous acid 
A)  hydrosulfuric acid 
B)  hydrosulfurous acid 
C)  sulfuric acid 
D)  sulfurous acid

Question 11

Which of the following is the conjugate acid of PO43−?

Accepted Answer

A)  H3PO4 
B)  H2PO4− 
C)  HPO42− 
D)  H3O+ 
A)  H3PO4 
B)  H2PO4− 
C)  HPO42− 
D)  H3O+

Question 12

Which of the following bases has the strongest conjugate acid?

Accepted Answer

A)  CH3COO− 
B)  C6H5O− 
C)  HSO4− 
D)  H2PO4− 
A)  CH3COO− 
B)  C6H5O− 
C)  HSO4− 
D)  H2PO4−

Question 13

Which of the following can be characterized as a strong electrolyte?

Accepted Answer

A)  0.001 M HCl 
B)  3.0 M CH3COOH 
C)  both 0.001 M HCI and 3.0 M CH3COOH 
D)  neither 0.001 M HCI or 3.0 M CH3COOH 
A)  0.001 M HCl 
B)  3.0 M CH3COOH 
C)  both 0.001 M HCI and 3.0 M CH3COOH 
D)  neither 0.001 M HCI or 3.0 M CH3COOH

Question 14

Which of the following statements best describes the acid-base relationship?

Accepted Answer

A)  As acid strengths increase, conjugate base strengths increase. 
B)  As acid strengths increase, conjugate base strengths decrease. 
C)  As acid strengths increase, conjugate base strengths increase and decrease 
D)  None of these. 
A)  As acid strengths increase, conjugate base strengths increase. 
B)  As acid strengths increase, conjugate base strengths decrease. 
C)  As acid strengths increase, conjugate base strengths increase and decrease 
D)  None of these.

Question 15

What is the name of the acid that dissociates to give the nitrate ion, NO3−?

Accepted Answer

A)  hydronitric acid 
B)  nitric acid 
C)  hyponitrous acid 
D)  nitrous acid 
A)  hydronitric acid 
B)  nitric acid 
C)  hyponitrous acid 
D)  nitrous acid

Question 16

Which of the following gases is produced when an acid reacts with an active metal?

Accepted Answer

A)  CO2(g) 
B)  H(g) 
C)  H2(g) 
D)  H2O(g) 
A)  CO2(g) 
B)  H(g) 
C)  H2(g) 
D)  H2O(g)

Question 17

Which of the following is a cause of respiratory acidosis?

Accepted Answer

A)  a poor diet 
B)  hyperventilation 
C)  hypoventilation 
D)  intense exercise 
A)  a poor diet 
B)  hyperventilation 
C)  hypoventilation 
D)  intense exercise

Question 18

Which of the following pH values corresponds to a highly basic solution?

Accepted Answer

A)  2.8 
B)  6.8 
C)  7.2 
D)  11.2 
A)  2.8 
B)  6.8 
C)  7.2 
D)  11.2

Question 19

Which of the following buffers is present in human blood?

Accepted Answer

A)  H2CO3/HCO3− 
B)  HC2H3O2/C2H3O2− 
C)  both H2CO3/HCO3- and HC2H3O2/C2H3O2- 
D)  none of these 
A)  H2CO3/HCO3− 
B)  HC2H3O2/C2H3O2− 
C)  both H2CO3/HCO3- and HC2H3O2/C2H3O2- 
D)  none of these

Question 20

Which factor do we use to determine the stronger acid when comparing the strengths of two weak acids?

Accepted Answer

A)  the formula weights of the acids 
B)  the numbers of protons that the acids can lose 
C)  the pKa values of the acids 
D)  none of these 
A)  the formula weights of the acids 
B)  the numbers of protons that the acids can lose 
C)  the pKa values of the acids 
D)  none of these

Exam 8: Acids and Bases

Which of the following is present in buffers that do not readily permeate cell membranes?

Which of the following acids has long been used as a test for proteins?

Which of the following ions does a base produce according to the original Arrhenius definition of a base?

Which of the following can be characterized as a strong base?

Which of the following is the conjugate acid of water?

Hydrocyanic acid, HCN, is a weak acid. Which of the following is the correct expression for the Ka of hydrocyanic acid?

Which of the following buffers will have the lowest pH?

Which of the following is the formula used to calculate the pH of a solution?

Which of the following solutions can function as a buffer?

Sulfites, salts of the anion SO32−, are found in wines as preservatives. The acid associated with the sulfite ion is H2SO3. What is the name of H2SO3?

Which of the following is the conjugate acid of PO43−?

Which of the following bases has the strongest conjugate acid?

Which of the following can be characterized as a strong electrolyte?

Which of the following statements best describes the acid-base relationship?

What is the name of the acid that dissociates to give the nitrate ion, NO3−?

Which of the following gases is produced when an acid reacts with an active metal?

Which of the following is a cause of respiratory acidosis?

Which of the following pH values corresponds to a highly basic solution?

Which of the following buffers is present in human blood?

Which factor do we use to determine the stronger acid when comparing the strengths of two weak acids?

Matter, Energy, and Measurement

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Chemical Reactions

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Solutions and Colloids

Reaction Rates and Chemical Equilibrium

Nuclear Chemistry

Organic Chemistry

Alkanes

Alkenes, Alkynes, and Aromatic Compounds

Alcohols, Ethers, and Thiols

Chirality: the Handedness of Molecules

Amines

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Carboxylic Anhydrides, Esters, and Amides

Carbohydrates

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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

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Nutrition

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Filters

Hydrocyanic acid, HCN, is a weak acid. Which of the following is the correct expression for the K_a of hydrocyanic acid?

Sulfites, salts of the anion SO₃²⁻, are found in wines as preservatives. The acid associated with the sulfite ion is H₂SO₃. What is the name of H₂SO₃?

Which of the following is the conjugate acid of PO₄³⁻?

What is the name of the acid that dissociates to give the nitrate ion, NO₃⁻?