Question

the hydrogen bond between two water molecules forms because water is
nonpolar.

polar.

hydrophobic.

a small molecule.

a liquid.

Explanation:

To determine why hydrogen bonds form between water molecules, we analyze each option:

• Nonpolar molecules do not form hydrogen bonds easily, and water is polar, so "nonpolar" is incorrect.
• Polar molecules have a partial positive and partial negative charge. In water (\(H_2O\)), the oxygen atom is more electronegative than hydrogen, creating a polar covalent bond. The partial positive hydrogen of one water molecule is attracted to the partial negative oxygen of another, forming a hydrogen bond. So "polar" is correct.
• Hydrophobic substances repel water and do not relate to hydrogen bond formation in water, so "hydrophobic" is incorrect.
• The size of the molecule (being small) is not the reason for hydrogen bond formation. Many small molecules are nonpolar and don't form hydrogen bonds, so "a small molecule" is incorrect.
• The state of matter (being a liquid) is a result of hydrogen bonding and other factors, not the cause of hydrogen bond formation. So "a liquid" is incorrect.

Answer:

B. polar