This document discusses the three states of matter - solids, liquids, and gases - and how changing temperature can cause matter to change states. It uses water as an example, explaining that heating ice causes it to melt into liquid water, heating the liquid water causes it to boil and become steam gas, and cooling steam causes it to condense back into liquid water. The key point is that raising or lowering the temperature of matter can change its state from solid to liquid to gas or back again.

1. Changing Phases!!!

2. We know there are three states of matter!

3. Your state of matter . . .
⚫ . . . Depends on how closely bound your
molecules are!!
⚫Solids have molecules that are tightly
bound together!
⚫Liquids have molecules that are loosely
bound together!
⚫Gases have molecules that have virtually
no binding!!!

4. Changing States . . . .
⚫ Matter can actually change states!
⚫ A solid can become a liquid . . .
⚫ A liquid can become a gas . . . .
⚫ A gas can become a liquid . . . .
⚫ A liquid can become a solid . . .
⚫ And – sometimes – a solid can become a gas!!
⚫ But how?!?!?!

5. It’s all about the temperature!
⚫If you change the
temperature of
matter, you can
sometimes change its
state.
⚫Think about water . . .
. It’s the easiest
example!!!
⚫Let’s start with a block
of ice . . . .

6. . . . And we’ll heat it up!!!!
⚫ What will happen to the
ice if we raise the
temperature?
⚫ Sure . . . It will melt?
⚫ Why?
⚫ Well, because we are
adding energy to the
molecules in the ice.
They start moving
around and their bond
loosens.
⚫ The solid becomes a
liquid!!!

7. . . . And we’ll heat it up some more!!!
⚫ What happens if we keep
heating it up??
⚫ Well, that water will boil!
⚫ And it will change to a
gas!!!
⚫ Steam that comes off a
boiling pot is still water, but
it is in a gaseous form!!!!
⚫ The molecules now have
LOTS of energy and can’t
stay close together!!!
⚫ It’s evaporation!!!

8. . . . Now let’s cool it down!!!
⚫ There is always
water vapor in
the air!!
⚫ If you cool it
down, you can
make it into a
liquid . . . .
⚫ It’s called
condensation!!!
⚫ Let’s do it!!!!

9. Raising/Lowering Temps . . .
⚫ . . . Changes states of matter!!!
⚫If you raise the temperature, you can
change a solid to a liquid to a gas!!
⚫If you lower the temperature, you can
change a gas to a liquid to a solid!!!