Thermal Energy
When I add heat to a substance, what happens to the temperature?
Why are we not able to see the particles in an object just by looking at them?
They are way too small!
A rain puddle on the ground becoming ice when it is cold at night.
Freezing
What is freezing?
Liquid to solid
What is thermal energy?
Heat
True or false: To make something cold, I must add coldness to it!
FALSE!!! We remove heat!
Draw a picture of the particles before and after melting
Particles should be close together in the beginning and then further apart like a liquid at the end of the process.
Hot soup boiling on the stove
Evaporation
What is melting?
What is a phase change?
One state of matter changing into another
When thermal energy is added to a substance undergoing a phase change, what happens to the temperature?
Nothing! It stays the same!
Draw the particles before and after condensation
Particles should be far apart and come closer.
Water vapor from the air touching a cold glass of iced tea and creating water droplets
Condensation
What is evaporation?
Going from liquid to gas would be:
Evaporation
When heat is added to a substance, the particles will:
increase in speed.
Draw the particles in a substance before and after deposition
Particles start really far from each other and come closer together and form a rigid structure.
Dry ice releasing carbon dioxide gas when exposed to warm temperatures.
Sublimation
What is condensation?
Gas to liquid
Going from a gas to a solid would be which phase change?
Deposition
Heat moves from:
Hot places to cold places
Draw the particles before and after evaporation
Particles are loosely moving around and then spreading around everywhere.
Frost forming on grass on a cold winter morning.
Deposition
What is sublimation?
Solid to gas, skipping right over the liquid phase
Spell the two phase changes that skip over the liquid phase.
D E P O S I T I O N
S U B L I M A T I O N