Question

label the diagram to show how hydrogen bonds form. a label may be used once, twice, or not at all.

Explanation:

Hydrogen bonds form between a hydrogen atom covalently - bonded to a highly electronegative atom (such as oxygen, nitrogen, or fluorine) and another electronegative atom. In water ($H_2O$), the hydrogen of one water molecule is attracted to the oxygen of another water molecule. The oxygen is highly electronegative and has a partial negative charge, while the hydrogen has a partial positive charge.

Answer:

The oxygen atom of one water molecule is labeled 'O'. The hydrogen atoms of the water molecule are labeled 'H'. The hydrogen atom that is part of the hydrogen - bonding interaction with the oxygen of another water molecule is labeled 'H'. The oxygen atom involved in the hydrogen - bonding from the other water molecule is labeled 'O'.