•What happens to a puddle of water on a
warm day?
•What happens to ice if left outside on a
warm day?
•What happens to a pond during very cold
temperatures?
•States of matter depend on molecular motion.
•Matter changes states when thermal energy is added or
taken away.
•(((O)))(((O)))= O O
•Solids become a liquid by getting so much energy they
move faster and faster then are broken free from their
fixed position.
•When a solid changes to a liquid we call this MELTING.
•How do we know when a solid gets too much energy
and will break free from their fixed position?
•Melting point- a certain temperature that will
cause a solid’s particles to break free.
•SOLID TO LIQUID= MELTING
The opposite of melting is ____________?
•Freezing- the change from a liquid to a solid.
•When a substance freezes the particles in a liquid
move so slowly that they begin to take on fixed
position, freezing. Or becoming a solid.
•In order to make something freeze, or become a solid
you must take away
ENERGY.
How do you do this? By placing a substance into a
freezer, and the freezer slows down the particles by
taking away energy and turning liquids into solids.
•Melting and freezing are reversible, and are NOT
chemical changes.
Vaporization- takes place when the particles in a liquid gain enough
energy to move independently, forming a gas.
Two types of Vaporization
1. Evaporation- when a liquid vaporizes only on the top surface of a
liquid.
2. Boiling- when a liquid changes into a gas from below and on the
surface.
• Boiling Point- the temperature at which a liquid boils.
Sublimation- occurs when surface particles of a solid gain
enough energy that they form a gas.
•During sublimation particles of a solid do not pass
through the liquid state as they form a gas.
•As dry ice changes states it absorbs thermal energy.
•Typically this occurs in colder climates where there is
snow, and usually the temperature will remain below 0
Celsius but still lose snow from the ground.
•How does the motion of the particles change during
sublimation?
http://teacher.scholastic.com/activities
/studyjams/matter_states/
Energy
Melting
((0)) ((0)) ((0))
particles go crazy
Energy
Vaporization
O
O
particles go crazy