AP Biology Properties of Water

Properties of Water

The Water Molecule

Water molecules are made of the elements Hydrogen and Oxygen.

H₂O= 2 Hydrogen atoms and 1 Oxygen atom.

Multiple Choice

A water molecule is made of...

• All Hydrogen atoms

• All Oxygen atoms

• 2 Oxygen atoms and 1 Hydrogen atom

• 2 Hydrogen atoms and 1 Oxygen atom

Polarity

• Polar opposites- Opposites attract

• Molecules stick together like magnets

I wonder...

What would happen if I squeezed a sponge out in outerspace

Open Ended

What do you think will happen?

Cohesion

Attraction between molecules of the same substance

Adhesion

An attraction between molecules of different substances

Open Ended

So what happened to the water in space? Is it what you expected? Use the words adhesion and cohesion in your answer

How is he doing that?!?!

***Hint it has everything to do with cohesion

Surface Tension

• A measure of how difficult it is to stretch or break the surface of a liquid

• The molecules at the surface do not have other like molecules on all sides of them and consequently they cohere more strongly to those directly associated with them on the surface.

Multiple Choice

An attraction between molecules of different substances

• Cohesion

• Adhesion

• Surface Tension

Multiple Choice

A measure of how difficult it is to stretch or break the surface of a liquid

• Cohesion

• Adhesion

• Surface Tension

Multiple Choice

Attraction between molecules of the same substance

• Cohesion

• Adhesion

• Surface Tension

Specific Heat

• So why does it take water So long to heat up?

• As you can see its more than just putting the pot on the stove...

Specific Heat

On your notes page describe the relationship between specific heat and vaporization

Open Ended

What is the relationship between Vaporization and Specific heat?