Sections 5.1 and 5.2 Energy and Chemical Reactions

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Presentation transcript:

Sections 5.1 and 5.2 Energy and Chemical Reactions Principles of Thermodynamics

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

Control of Chemical Reactions

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

Principles of Thermodynamics: Systems and Surroundings

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

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

Principles of Thermodynamics:

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

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

Principles of Thermodynamics: ΔH and bond energies

Energy Level Diagrams (Enthalpy Diagrams):

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