Unit 8: Thermochemistry

Energy

• Temperature and motion are related to energy
• Temperature- heat energy
• Motion- Kinetic energy
• What happens to the motion of atoms when you add heat?

Temperature & Motion

• Rub your hands together quickly.
• What did you notice about the temp?
• Increasing movement increases temp.

Heat

• Heat is the FLOW of temperature
• Heat ALWAYS flows from hot to cold
• Represented by the letter Q

Discuss: Ice Cubes in H2O

• Are the ice or liquid water molecules moving faster?
• What is happening as the ice melts?
• Illustrate the direction of heat flow.
• When all the ice melts which molecules are moving faster?