Question

1. what property of water allows hydrogen bonds to form between water molecules?

Explanation:

The polarity of water molecules (where oxygen is slightly negative and hydrogen is slightly positive) allows hydrogen bonds to form between water molecules. The partial positive charge on hydrogen of one water molecule is attracted to the partial negative charge on oxygen of another water molecule, facilitating hydrogen bond formation.

Answer:

The polarity of water molecules (specifically, the presence of partial positive charges on hydrogen atoms and partial negative charges on oxygen atoms within water molecules) allows hydrogen bonds to form between water molecules.