AP BIO unit 1

How does water’s polarity affect the way it interacts with other molecules?

allows it to hydrogen bond with other molecules and other polar or charge molecules

How does water’s polarity affect the way it behaves in general?

• allows it to exhibit cohesion

• have surface tension

• resist temperature changes

• act as an excellent solvent

What is cohesion?

water molecules are attracted to and can hydrogen bond w/ other water molecules

what is adhesion?

water molecules are attracted to and can hydrogen bond w/ other polar or charged molecules

What does cohesion allow water to do?

allows water to stick together as a fluid and form droplets on surfaces

What does adhesion allow water to do?

allows water to adhere to other molecules or surfaces

What causes surface tension?

directly caused by the fact that water is cohesive

Because water is both cohesive and adhesive, it exhibits what action?

capillary action

what is surface tension?

The cohesion of water molecules @ the surface of a body of water

• hydrogen bonds are stronger, so they allow water to have a defined surface that resists being ruptured