phases, phase changes, chemical and physical changes by: brianna shields march 19, 2007
TRANSCRIPT
DO NOW• 1. What tool is used to measure mass?
• 2. What is one unit used to label density?
• 3. What is volume?
GOAL• To discuss the states of matter and the
terms relative to changes in state• To distinguish between chemical and
physical changes
Phases of Matter• Solid • 6. Amorphous solids
lose shape/flow like slow moving liquids– Ex: candle wax, window
glass, tar
Phases of Matter• Liquid • 1. No definite shape-
takes the shape of the container
• 2. Has a definite volume
Phases of Matter• Liquid • 5. Varying viscosities=
resistance of a liquid to flow– Honey has a high viscosity
Phases of Matter• Gas • 3. Particles are spread
far apart- fill all spaces• 4. Contantly moving and
bumping into eachother• 5. High energy
Phases of Matter• Gas • 6. Particles can be
squeezed in closer– Bumping into eachother and
walls causes pressure
Phase Website• Phases of matter at the molecular level
Phase Changes• Phase
Changes• Matter such as water can
change from phase to phase by adding or taking away heat energy
Phase Changes• Sublimati
on• Solid skips to gas• Must gain a lot of heat
energy• Ex:
– Freezer Frost– Dry Ice– Cirrus Clouds
Phase Change Website• Click here to view a phase change
Assessment• What type of phase change is seen in
this picture? Explain what occurs during this phase change
Assessment• What type of phase change is seen in
this picture? Explain what occurs during this phase change
Physical and Chemical Changes• Physical
Change• Change in the
appearance of a substance without changing its identity
• The atoms remain unchanged
Physical and Chemical Changes• Chemical
Change• A substance changes into
a new and different substance
• The atoms are altered• Often involves chemical
rx