1. Conduction, Convection, Radiation
Thermochemistry
Conduction, Convection, Radiation

2. Energy Transformations
“Thermochemistry” - concerned with heat changes that occur during chemical reactions
Energy - capacity for doing work or supplying heat
weightless, odorless, tasteless
if within the chemical substances- called chemical potential energy

3. Energy Transformations
Gasoline contains a significant amount of chemical potential energy
Heat - represented by “q”, is energy that transfers from one object to another, because of a temperature difference between them.
only changes can be detected!
flows from warmer  cooler object

4. 3 types of Heat Transfer

5. Conduction
Conduction – heat transferred by particles colliding into one another, such as in a metal.
Transfer of energy by touch
Not an effective transfer in a gas.
Primarily solids
Used for cooking on stove tops.

6. Convection
Convection – heat transferred by the circulation of a fluid (or gas), such as in a heating system at home; important near the surface of the Sun.
Hot air rises cool air falls
Used for baking in ovens.

7. Radiation
Radiation – heat transferred by the flow of electromagnetic radiation, like heat felt from the campfire.
Radiation is the only type of heat transfer that can happen in a vacuum.
Heat transfer through
waves