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# Matter & Energy 2.2 Notes

TSW explain the thermal changes of matter.
by

## Michael Goorsky

on 2 April 2014

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#### Transcript of Matter & Energy 2.2 Notes

Sec. 2.2
Changes of states are physical changes

Matter can change from one state to another.

How does matter change from one state to another?

Why is a change in state a physical change rather than a chemical change?
What is boiling?
What is condensation?

liquid turning into a gas - heating
bubbles!

gas becoming a liquid - cooling
Make sure you have an example for melting, freezing, and evaporation.
POP Quiz
1. What physical property compares mass and volume?
2. Is giving a dog a haircut a physical change?
3. What is an indication of a chemical change?
4. A lump of gold has a volume of 20cm and a mass of 386g. What is the density?
Random trivia for the person sitting next to the person in KU chair.
Who is this singer?
Kid Rock
1. Matter changes to a different state when the molecules are rearranged.

2. The identity (chemical formula) of the substance does not change.
1.How do the particles in a liquid differ from those in a solid?
The particles in a liquid can move past each other.

2. How do solids become liquids?
Melting is when a solid becomes a liquid. This happens at the melting point of the solid.

3. What state is a substance in if its temperature is slightly above its freezing point?
liquid
1. Where does evaporation usually occur?
2. By what process does a solid change directly to a gas?
3. Give an example of sublimation
1. Where does evaporation usually occur?
At the surface of a liquid
2. By what process does a solid change directly to a gas?
sublimation
3. Give an example of sublimation.
Dry Ice changing to carbon dioxide gas
checkout the sublimation video
1. What physical property compares mass and volume?

Density
Is giving a dog a haircut a physical change?
Yes
3. What is an indication of a chemical change?
Odor, Temperature, Change in color, Bubbles, formation of a solid
A lump of gold has a volume of 20cm and a mass of 386g. What is the density?
19.3 g/cm3
Name that change . . . . is the name of the game.
Write the name of the change,
Physical
or
Chemical
.
1. Wood burning to ashes.
2. Wool turning into a sweater.
3. Digesting a snickers bar.
4. A chainsaw cutting a branch off of a tree.
1. Wood burning to ashes.
chemical
2. Wool turning into a sweater.
physical
3. Digesting a snickers bar.
chemical
4. A chainsaw cutting a branch off of a tree.
physical
Complete the Review & Prior Knowledge Cornell Notes Boxes
melting point - added heat energy

temperature when solids turn into a liquid
freezing point - losing heat energy

temperature when liquid turn into a solid
melting - solid becomes a liquid
(water melts at 0 degrees C or 32 degrees F)
freezing - liquid becomes a solid
(water freezes at 0 degrees C or 32 degrees F)
All solids have become liquids
Evaporating - liquid becomes a gas
happens at many temperatures
Condensing - gas becomes a liquid
happens at many temperatures
boiling point - temperature at which liquid turns into a gas with added heat energy
boiling - liquids become a gas
happens at 100 degrees C or 212 degrees F
All liquid has become gas
boiling point - temperature at which liquid turns into a gas with added heat energy
freezing - when a liquid becomes a solid
- losing heat
Solid - solids can change temperature
solid to liquid
temp where melting begins
liquid to solid
temp where freezing begins
liquid to gas - happens on surface
solid directly to gas
liquid to gas with bubbles from heat source
gas to liquid
Temp at which boiling begins
Full transcript