Question 1

Which is true about the solubility of electrolytes in water?

Accepted Answer

A) They are all insoluble in water. 
B) They are usually only sparingly soluble in water. 
C) They often form super-saturated aqueous solutions. 
D) They readily dissolve and ionize in water. 
A) They are all insoluble in water. 
B) They are usually only sparingly soluble in water. 
C) They often form super-saturated aqueous solutions. 
D) They readily dissolve and ionize in water.

Question 2

Which statement is true about hydrogen bonds between water molecules?

Accepted Answer

A) They are about as strong as the covalent bonds in a water molecule. 
B) They arise because of the linear geometry of water. 
C) They cause water to have an unusually low freezing point for its molecular weight. 
D) They involve the unequal sharing of a proton between water molecules. 
E) In liquid water the same molecules attract to each other over long time periods. 
A) They are about as strong as the covalent bonds in a water molecule. 
B) They arise because of the linear geometry of water. 
C) They cause water to have an unusually low freezing point for its molecular weight. 
D) They involve the unequal sharing of a proton between water molecules. 
E) In liquid water the same molecules attract to each other over long time periods.

Question 3

What is the approximate pH of a 0.10 M solution of a weak acid that has a Ka of 5 × 10-⁵ M?

Accepted Answer

A) 2.7 
B) 5.3 
C) 4.8 
D) 11.3 
E) Cannot determine from the information given. 
A) 2.7 
B) 5.3 
C) 4.8 
D) 11.3 
E) Cannot determine from the information given.

Question 4

The ________ pressure is the pressure required to prevent the flow of solvent through a solvent-permeable membrane that separates two solutions of different solute concentration.

Accepted Answer

A) hydrostatic 
B) electromotive 
C) osmotic 
D) partial 
A) hydrostatic 
B) electromotive 
C) osmotic 
D) partial

Question 5

The solubility rule "like dissolves like" refers primarily to similarities in amphipathic nature between the solute and solvent.

Accepted Answer

A) True 
 B)False

Question 6

London dispersion forces are attractive forces that arise due to

Accepted Answer

A) infinitesimal dipoles generated by the constant random motion of electrons. 
B) permanent dipoles of molecules containing covalent bonds between atoms of very different electronegativities. 
C) the hydrophobic effect. 
D) ion pairing between oppositely charged functional groups. 
A) infinitesimal dipoles generated by the constant random motion of electrons. 
B) permanent dipoles of molecules containing covalent bonds between atoms of very different electronegativities. 
C) the hydrophobic effect. 
D) ion pairing between oppositely charged functional groups.

Question 7

Water molecules that surround a less polar molecule in solution are immobile and ordered.

Accepted Answer

A) True 
 B)False

Question 8

The pH of human blood is primarily maintained at 7.4 by

Accepted Answer

A) ATP. 
B) carbon dioxide-carbonic acid buffer systems. 
C) a bicarbonate buffer system. 
D) B and C. 
E) A,B and C. 
A) ATP. 
B) carbon dioxide-carbonic acid buffer systems. 
C) a bicarbonate buffer system. 
D) B and C. 
E) A,B and C.

Question 9

Calculate the value of pKa for an acid when Ka = 2.6 × 10-4.

Accepted Answer

A) -3.59 
B) +3.59 
C) -8.25 
D) +8.25 
E) +3800 
A) -3.59 
B) +3.59 
C) -8.25 
D) +8.25 
E) +3800

Question 10

The oxygen atom of water is nucleophilic because

Accepted Answer

A) it has a negative oxidation number. 
B) it carries a partial positive charge. 
C) it has two unshared pair of electrons. 
D) it seeks electron-rich molecules. 
E) All of the above. 
A) it has a negative oxidation number. 
B) it carries a partial positive charge. 
C) it has two unshared pair of electrons. 
D) it seeks electron-rich molecules. 
E) All of the above.

Question 11

The hydrogen bonding between water molecules in ice gives water an unusually low melting point compared to other molecules of similar size and molecular weight that cannot form hydrogen bonds.

Accepted Answer

A) True 
 B)False

Question 12

Which statement does NOT explain the polarity of water?

Accepted Answer

A) Oxygen is more electronegative than hydrogen. 
B) Water molecules have a bent geometry (V-shaped). 
C) The oxygen in water has sp2 hybrid orbitals. 
D) In water the hydrogen carries a partial positive charge (δ+). 
A) Oxygen is more electronegative than hydrogen. 
B) Water molecules have a bent geometry (V-shaped). 
C) The oxygen in water has sp2 hybrid orbitals. 
D) In water the hydrogen carries a partial positive charge (δ+).

Question 13

Hydrogen bonds in the interior of a protein or other macromolecule are stronger than those on the exterior.

Accepted Answer

A) True 
 B)False

Question 14

Since HCl is a strong acid its value of Ka is ________.

Accepted Answer

A) effectively equal to infinity 
B) equal to Kw 
C) zero 
D) dependent on the concentration of HCl 
A) effectively equal to infinity 
B) equal to Kw 
C) zero 
D) dependent on the concentration of HCl

Which is true about the solubility of electrolytes in water?

Which statement is true about hydrogen bonds between water molecules?

What is the approximate pH of a 0.10 M solution of a weak acid that has a Ka of 5 × 10-⁵ M?

The ________ pressure is the pressure required to prevent the flow of solvent through a solvent-permeable membrane that separates two solutions of different solute concentration.

The solubility rule "like dissolves like" refers primarily to similarities in amphipathic nature between the solute and solvent.

London dispersion forces are attractive forces that arise due to

Water molecules that surround a less polar molecule in solution are immobile and ordered.

The pH of human blood is primarily maintained at 7.4 by

Calculate the value of pKa for an acid when Ka = 2.6 × 10-4.

The oxygen atom of water is nucleophilic because

The hydrogen bonding between water molecules in ice gives water an unusually low melting point compared to other molecules of similar size and molecular weight that cannot form hydrogen bonds.

Which statement does NOT explain the polarity of water?

Hydrogen bonds in the interior of a protein or other macromolecule are stronger than those on the exterior.

Since HCl is a strong acid its value of Ka is ________.

Introduction to Biochemistry

Amino Acids and the Primary Structures of Proteins

Proteins: Three-Dimensional Structure and Function

Properties of Enzymes

Mechanisms of Enzymes

Coenzymes and Vitamins

Carbohydrates

Lipids and Membranes

Introduction to Metabolism

Glycolysis

Gluconeogenesis, the Pentose Phosphate Pathway, and Glycogen Metabolism

The Citric Acid Cycle

Electron Transport and Atp Synthesis

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Nucleic Acids

DNA Replication, repair, and Recombination

Transcription and RNA Processing

Protein Synthesis

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Exam 2: Water

Which is true about the solubility of electrolytes in water?

Which statement is true about hydrogen bonds between water molecules?

What is the approximate pH of a 0.10 M solution of a weak acid that has a Ka of 5 × 10-⁵ M?

The ________ pressure is the pressure required to prevent the flow of solvent through a solvent-permeable membrane that separates two solutions of different solute concentration.

The solubility rule "like dissolves like" refers primarily to similarities in amphipathic nature between the solute and solvent.

London dispersion forces are attractive forces that arise due to

Water molecules that surround a less polar molecule in solution are immobile and ordered.

The pH of human blood is primarily maintained at 7.4 by

Calculate the value of pKa for an acid when Ka = 2.6 × 10-4.

The oxygen atom of water is nucleophilic because

The hydrogen bonding between water molecules in ice gives water an unusually low melting point compared to other molecules of similar size and molecular weight that cannot form hydrogen bonds.

Which statement does NOT explain the polarity of water?

Hydrogen bonds in the interior of a protein or other macromolecule are stronger than those on the exterior.

Since HCl is a strong acid its value of Ka is ________.

Introduction to Biochemistry

Amino Acids and the Primary Structures of Proteins

Proteins: Three-Dimensional Structure and Function

Properties of Enzymes

Mechanisms of Enzymes

Coenzymes and Vitamins

Carbohydrates

Lipids and Membranes

Introduction to Metabolism

Glycolysis

Gluconeogenesis, the Pentose Phosphate Pathway, and Glycogen Metabolism

The Citric Acid Cycle

Electron Transport and Atp Synthesis

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Nucleic Acids

DNA Replication, repair, and Recombination

Transcription and RNA Processing

Protein Synthesis

Filters