Aqueous Chemistry

Which of the following elements could be involved in forming a hydrogen bond?

• C

• O

• S

• B and C

• All of the above

The hydrophobic effect, resulting in the exclusion of nonpolar substances from an aqueous solution, is the result of strong attractive forces between the nonpolar molecules.

• True

• False

Nonpolar molecules experience a small attractive force due to:

• Ionic interactions

• Hydrogen bonding

• London dispersion forces

• All of the above

• None of the above

What is the conjugate base of the weak acid H₃BO₃?

What is the conjugate acid of PO₄³⁻?

• HPO₄²⁻

• H₂PO₄⁻

• H₃PO₄

Which of the following statements about hydrogen bonding in water is FALSE?

• The bonds are partially covalent.

• The bonds are a type of electrostatic interaction.

• The bonds are strong and therefore long-lived in solution.

• They are longer than a covalent O—H bond.

• They are shorter than the sum of the van der Waals radii of O and H.

According to the table below, which of the elements listed would likely be the strongest H-bond acceptor?

• C

• F

• H

• N

• O

Which numbered arrow in the image above points to a hydrogen bond?

• 1

• 2

• 3

• 4

Which of the molecules below would be very soluble in water due to the formation of H-bonds?

• O₂

• Benzene

• NaCl

• Ethanol

• Phospholipid