1. Sections 5.1 and 5.2 Energy and Chemical Reactions
Principles of Thermodynamics

2. In these sections:
types of energy
energy units
principles of thermodynamics
enthalpy
endothermic/exothermic systems

3. Control of Chemical Reactions

4. Energy Conversion Examples:
1. dropping a rock
2. using a flashlight
3. driving a car

6. Principles of Thermodynamics:
Systems and Surroundings

7. Principles of Thermodynamics:
Isolated system:
neither matter nor energy can be passed to or from the surroundings
Closed system:
energy but not matter can be passed to or from the surroundings

8. Principles of Thermodynamics:
ΔEsystem = q + w
First law of thermodynamics: Euniverse = 0

9. Principles of Thermodynamics:

10. ΔH = heat exchanged under constant pressure
Principles of Thermodynamics:
Enthalpy = internal energy + pressure x volume
H = E + PV
ΔH = heat exchanged under constant pressure

11. Principles of Thermodynamics:
Endothermic process:
heat is transferred from the surroundings to the system
Exothermic process:
heat is transferred from the system to the surroundings

12. Principles of Thermodynamics:
ΔH and bond energies

13. Energy Level Diagrams (Enthalpy Diagrams):