Download Energy - RidenourMHS

Energy
 Ability to change or move matter
 Sources of energy:
Energy
 Types of Energy
 Potential energy
 Kinetic energy
 Thermal energy
Energy
 Types of energy
 Potential Energy
Stored energy
Stored in chemical bonds and the
possibility of movement
 Kinetic Energy
- Energy of motion
- Part 2 of the Kinetic Theory!!!
- Solids << liquids << gas
Kinetic vs. Potential Energy
Energy
 Thermal Energy
- Total amount of kinetic energy
- The more particles move, the more
kinetic energy, which means the
more thermal energy
Energy
Rank these in order of greatest kinetic energy
to least…
Carbon Dioxide gas
Dry ice
Soda
Energy
 Draw an analogy to represent each type
of energy…
Thermal Energy
 Also referred to as heat
 Can be released (exothermic) or
absorbed (endothermic)
Thermal Energy
Is it endothermic or exothermic?
 Making ice cubes
 Baking bread
 Human Digestion
 Cooking an egg
 Melting
Chocolate
 Burning a match
 Formation of
clouds
 Evaporation of
water
 Photosynthesis
 Heat is given off
during a reaction
 Heat is needed to
make a reaction
Endothermic/Exothermic
 When you add
thermal energy
(endothermic)…
 When you take away
thermal energy
(exothermic)…
Thermal Expansion
 Addition of heat results in expansion of
substances
 More kinetic energy in a substance
 Particles move farther apart
 Example: If a jar lid is tough to
open, you can run it under
hot water. Why?
Thermal Expansion Lab
 Do all liquids expand at the same rate?
 How does a thermometer work?
Thermal Expansion Graph
Change in Height (cm)
Thermal Expansion of Liquids
35
30
25
20
15
10
5
0
Change in Temp Blue
Change in Temp
Yellow
1
2
3
4
5
6
7
Temp (C)
8
9 10 11