Unit 1.1: Properties of Water

What property of water results from its polarity and hydrogen bonding?

Cohesion, adhesion, surface tension, ice’s ability to float.

What does "polarity" mean in a molecule?

Having a partial positive side and a partial negative side.

What is a hydrogen bond?

A strong attraction between hydrogen and nitrogen, oxygen, or fluorine.

What is cohesion in water?

Water molecules sticking to each other via hydrogen bonding.

What is adhesion in water?

Water molecules sticking to other substances via hydrogen bonding.

What is surface tension in water?

How difficult it is to break the surface of a liquid; high in water due to hydrogen bonds.

Example of surface tension’s biological importance?

Allows insects to walk on water.

Why does ice float on water?

Hydrogen bonds create a crystalline structure less dense than liquid water.

Why is floating ice important for organisms?

Insulates liquid water below, allowing survival in freezing temps.