Question

What effect does hydrogen bonding have on the physical properties of water?

Answer 1

it increases the boiling point

Answer 2

It causes water to require more energy before the molecules can break their bonds between each other to turn into steam, meaning it stays liquid longer.

Water also uses the hydrogen bonds to form a rigid structure when it freezes that actually makes water less dense when in solid form than liquid, causing it to float on top of itself when it freezes so that lakes and bodies of water can't freeze completely from the bottom up and likely leave the earth unable to support life.

The hydrogen bonds take a lot of energy to break, so this also means that water can absorb a lot more energy before changing temperature.