AP BIOLOGY

Detailed explanation-1: -In the case of water, hydrogen bonds form between neighboring hydrogen and oxygen atoms of adjacent water molecules. The attraction between individual water molecules creates a bond known as a hydrogen bond.

Detailed explanation-2: -Hydrogen bonds are only found between hydrogens attached to oxygen, nitrogen, or fluorine. They increase the attraction between water molecules, therefore are harder to break in large numbers, causing an increase in boiling point.

Detailed explanation-3: -On this basis, among the given species, only HCOOH can form hydrogen bond with water.

Detailed explanation-4: -A molecule of water has two hydrogen atoms. Both of these atoms can form a hydrogen bond with oxygen atoms of different water molecules. Every water molecule can be hydrogen bonded with up to three other water molecules (See Fig. 3-7).

Detailed explanation-5: -Hydrogen bonding of water molecules The plus end of one-a hydrogen atom-associates with the minus end of another-an oxygen atom. These attractions are an example of hydrogen bonds, weak interactions that form between a hydrogen with a partial positive charge and a more electronegative atom, such as oxygen.