• http://www.youtube.com/watch?v=Ci5P5yy
0xlg
• http://www.youtube.com/watch?v=QBVM
m9i-pvo&NR=1&feature=fvwp
predict what will happen when an ice cube
is placed in a beaker
STATES OF MATTER
• Three States of Matter
Gas
Water Vapor
Liquid
Solid
Water
Ice
Phases Changes
Solid to Liquid: Melting
Liquid to Solid: Freezing
• Liquid to Gas: Evaporation
• Gas to Liquid: Condensation
• Gas to Solid: Sublimation (Deposition)
Frost
• Solid to Gas: Sublimation
Dry Ice
Heat/Energy is lost
Heat/Energy is gained
Latent Heat
Energy required to change the phase of a
substance, breaks the bonds of the
substance between phases
Temperatures do not rise.
Latent means hidden
Properties of Water
ESRT Page 1
J = Joule, a unit of energy
Phase changes when energy is
added/gained
Evaporation and Melting
(2260 J/g)
(334 J/g)
It takes a lot more energy to change phases
between liquid and gas
Phase changes when energy is
lost/released
Condensation and Freezing
(2260 J/g)
(334 J/g)
It takes a lot more energy to change phases
between liquid and gas
• How many joules of heat energy are
required to evaporate 2 grams of water
from a lake surface?
• 2g X 2260 J/g = 4520 J