Question 1

Which of these statements about hydrogen bonds is not true?

Accepted Answer

Individual hydrogen bonds in liquid water exist for many seconds and sometimes for minutes.

Answer

Individual hydrogen bonds are much weaker than covalent bonds.

Answer

The strength of a hydrogen bond depends on the linearity of the three atoms involved in the bond.

Answer

Hydrogen bonds account for the anomalously high boiling point of water.

Question 2

Molecules containing a large number of hydroxyl groups are:

Accepted Answer

soluble in water.

Answer

complex macromolecules.

Answer

nonpolar.

Answer

structurally less stable than those with fewer hydroxyls.

Question 3

Which statement about thermodynamics is true?

Accepted Answer

Entropy has a tendency to increase.

Answer

The total amount of energy can change after a chemical transformation.

Answer

Free energy is used up in an exergonic reaction.

Answer

Free energy, but not potential energy, can be kinetic.

Question 4

Which statement about hydrogen bonds is true?

Accepted Answer

They form between a highly electronegative atom and hydrogen.

Answer

They form between two hydrogen atoms.

Answer

They form only between hydrogen and oxygen atoms within a molecule.

Answer

They involve a transfer of electrons.

Question 5

The Henderson-Hasselbalch equation:

Accepted Answer

relates the pH of a solution to the pKa and the concentrations of acid and conjugate base.

Answer

allows the graphic determination of the molecular weight of a weak acid from its pH alone.

Answer

does not explain the behavior of di- or tri-basic weak acids

Answer

employs the same value for pKa for all weak acids.

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