Essential Questions?
What are the three states of water?
What is the boiling point of water?
What is the freezing point of water?
How does water change from a solid to liquid to gas?
How does heat or cooling effect how water changes?
Did you know?

There is more water on earth than any other substance.
 That water covers more than 70% of the Earth’s surface.

That you are made of more than 50% water.

Every living thing needs water to live.
What exactly is water?
 It’s a compound composed of two atoms of ____________and one atom of
____________. Also known as_________________.
What are the three states of H2O?

Solid- __________________________

Liquid-_____________,______________________,___________________

Gas-_____________________________
What occurs when you heat water?

One way to change water is to heat it. If you take water in its solid state,
_________________. If you heat ______________________ it does what?
____________________________________________________________.

It turns from a solid to a _____________________________________.


This occurs when its temperature rises above _________ degrees Celsius or
__________ degrees Fahrenheit.
Add more heat to liquid…

And evaporation speeds up….

What is evaporation you ask?

It is the change of a substance from the ______________to_____________ state. This occurs more quickly at higher temperatures.
What is the Boiling Point of H2O?

The temperature that makes water boil is __________ degrees Celsius or
___________ degrees Fahrenheit.

Have you ever left an uncovered pot of boiling water on a stove? What will happen in a short time? It will
________________________________________.

Therefore you have just turned a liquid into a gas by adding ________ which in turn caused ___________.
What happens when you cool H2O?

Now that you know what happens when you heat water does anyone know what happens when you cool water?

When you cool water vapor enough, it undergoes ____________________, which is the change of a substance from the gas to liquid state.

What occurs when you cool liquid even more? It turns to the ______________ state.
What makes H2O turn back into a solid state?

If cooled to 0 degrees Celsius or 32 degrees Fahrenheit it will
_______________ (turn back into a ________________).

Can we just skip the Liquid State?

__________, this is called ______________________. This is where a substance changes directly from a solid to a gas. It skips the liquid state in between.

Just remember that with each change of state that there is a gain or loss of
___________________ _________________________.