Question 1

The polarity of the O-H bond is caused by the ______ of oxygen relative to that of hydrogen.

Accepted Answer

higher ele

Question 2

If the pK values for phosphoric acid are 2.15, 6.82, and 12.38, at what pH would one observe equal amounts of H2PO4- and HPO42-?

Accepted Answer

A)  2.15 
B)  4.49 
C)  6.82 
D)  9.60 
E)  12.38 
A)  2.15 
B)  4.49 
C)  6.82 
D)  9.60 
E)  12.38

Question 3

Which of the following explains the interactions that occur between the atoms of water molecules and the ions that form when sodium chloride dissolves in water?

Accepted Answer

A)  Hydrogens interact with the sodium ion; oxygens interact with the chloride ion. 
B)  Hydrogens interact with the chloride ion; oxygens interact with the sodium ion. 
C)  Hydrogens interact with the sodium ion and the chloride ion. 
D)  Oxygens interact with the sodium ion and the chloride ion. 
E)  none of the above 
A)  Hydrogens interact with the sodium ion; oxygens interact with the chloride ion. 
B)  Hydrogens interact with the chloride ion; oxygens interact with the sodium ion. 
C)  Hydrogens interact with the sodium ion and the chloride ion. 
D)  Oxygens interact with the sodium ion and the chloride ion. 
E)  none of the above

Question 4

What would be the resulting pH if one drop (0.05 ml) of 1.0 M HCl was added to one liter of pure water (assume pH 7.0)?

Accepted Answer

A)  2.7 
B)  4.3 
C)  5.0 
D)  7.0 (there would be no significant change) 
E)  9.7 
A)  2.7 
B)  4.3 
C)  5.0 
D)  7.0 (there would be no significant change) 
E)  9.7

Question 5

-Which arrow points at a phosphoanhydride bond?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Question 6

If the pK values for phosphoric acid are 2.15, 6.82 and 12.38, _____ would predominate at pH 5, and _____ would predominate at pH 10.

Accepted Answer

A)  H3PO4; H2PO4- 
B)  H3PO4; HPO42- 
C)  H3PO4; PO43- 
D)  H2PO4-; PO43- 
E)  H2PO4-; HPO42- 
A)  H3PO4; H2PO4- 
B)  H3PO4; HPO42- 
C)  H3PO4; PO43- 
D)  H2PO4-; PO43- 
E)  H2PO4-; HPO42-

Question 7

Which of the following functional groups has two hydrogen bond donors and one hydrogen bond acceptor?

Accepted Answer

A)  alcohol 
B)  ester 
C)  thiol 
D)  amine 
E)  amide 
A)  alcohol 
B)  ester 
C)  thiol 
D)  amine 
E)  amide

Question 8

What is the pH of a solution that contains three parts acetic acid and one part sodium acetate? The pK for acetic acid is 4.76.

Accepted Answer

A)  5.24 
B)  5.06 
C)  4.46 
D)  4.28 
E)  cannot be determined from the given information 
A)  5.24 
B)  5.06 
C)  4.46 
D)  4.28 
E)  cannot be determined from the given information

The polarity of the O-H bond is caused by the ______ of oxygen relative to that of hydrogen.

If the pK values for phosphoric acid are 2.15, 6.82, and 12.38, at what pH would one observe equal amounts of H₂PO₄^- and HPO₄^2-?

Which of the following explains the interactions that occur between the atoms of water molecules and the ions that form when sodium chloride dissolves in water?

What would be the resulting pH if one drop (0.05 ml) of 1.0 M HCl was added to one liter of pure water (assume pH 7.0)?

-Which arrow points at a phosphoanhydride bond?

If the pK values for phosphoric acid are 2.15, 6.82 and 12.38, _ would predominate at pH 5, and _ would predominate at pH 10.

Which of the following functional groups has two hydrogen bond donors and one hydrogen bond acceptor?

What is the pH of a solution that contains three parts acetic acid and one part sodium acetate? The pK for acetic acid is 4.76.

Nucleic Acids

Proteins I

Proteins Iienzymes

Membranes and an Introduction to Signal Transduction

Carbohydrates I

The Common Catabolic Pathway

Carbohydrates II

Lipids I

Lipids II

Amine Metabolism

Metabolism Integration

Nucleotide Deoxynucleotide Metabolism

Dna Replication, Damage and Repair

Rna Synthesis

Protein

Control of Gene

Determination of Macromolecular Structure

Allosterism and Receptor-Ligand

Designer Proteins and Protein Folding

Biomolecule Purification

Bioinformatics and Omics

Signal

Protein Trafficking

Photosynthesis Nitrogen

Filters

Exam 1: The Chemical Foundations of Biochemistry

The polarity of the O-H bond is caused by the ______ of oxygen relative to that of hydrogen.

If the pK values for phosphoric acid are 2.15, 6.82, and 12.38, at what pH would one observe equal amounts of H2PO4- and HPO42-?

Which of the following explains the interactions that occur between the atoms of water molecules and the ions that form when sodium chloride dissolves in water?

What would be the resulting pH if one drop (0.05 ml) of 1.0 M HCl was added to one liter of pure water (assume pH 7.0)?

-Which arrow points at a phosphoanhydride bond?

If the pK values for phosphoric acid are 2.15, 6.82 and 12.38, _____ would predominate at pH 5, and _____ would predominate at pH 10.

Which of the following functional groups has two hydrogen bond donors and one hydrogen bond acceptor?

What is the pH of a solution that contains three parts acetic acid and one part sodium acetate? The pK for acetic acid is 4.76.

Nucleic Acids

Proteins I

Proteins Iienzymes

Membranes and an Introduction to Signal Transduction

Carbohydrates I

The Common Catabolic Pathway

Carbohydrates II

Lipids I

Lipids II

Amine Metabolism

Metabolism Integration

Nucleotide Deoxynucleotide Metabolism

Dna Replication, Damage and Repair

Rna Synthesis

Protein

Control of Gene

Determination of Macromolecular Structure

Allosterism and Receptor-Ligand

Designer Proteins and Protein Folding

Biomolecule Purification

Bioinformatics and Omics

Signal

Protein Trafficking

Photosynthesis Nitrogen

Filters

If the pK values for phosphoric acid are 2.15, 6.82, and 12.38, at what pH would one observe equal amounts of H₂PO₄^- and HPO₄^2-?

If the pK values for phosphoric acid are 2.15, 6.82 and 12.38, _ would predominate at pH 5, and _ would predominate at pH 10.