# What type of bonds are being broken when you melt ice?

Water molecules are polar. The oxygen atom has a partial negative charge $\left({\delta}^{-}\right)$ and the hydrogen atoms have a partial positive charge $\left({\delta}^{+}\right)$. Because of this, water molecules are attracted to one another. The hydrogen end of one molecule is attracted to the oxygen end of another molecule. This is called a hydrogen bond.
The following diagram shows the hydrogen bonds that at its freezing point cause the water molecules to form a crystalline structure, increasing volume, and decreasing density. Water is at its lowest density at ${0}^{\circ} \text{C}$, allowing it to float on liquid water.