ENERGY & THE 1 st LAW OF THERMO. 1 st Law : concerning quantity of energy Energy is conserved (Amount of energy is constant, but can change forms) (e.g.

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Presentation transcript:

ENERGY & THE 1 st LAW OF THERMO. 1 st Law : concerning quantity of energy Energy is conserved (Amount of energy is constant, but can change forms) (e.g. potential, kinetic, electrical, chemical, etc.)

Energy Macroscopic – system energy which value depends on a reference point (Kinetic Energy (KE), Potential Energy (PE) Microscopic – energy due to molecular interactions & activity (independent of any reference point) (Internal Energy, U) Total System Energy

Kinetic Energy (KE) Potential Energy (PE)

Internal Energy, U Molecular movement (vibration, collision, etc) sensible energy (molecular activity  temperature) Bond Energy between molecules (phase change) latent energy (constant temperature) Bond Energy between atoms in a molecule chemical energy Bond Energy between protons & neutrons in the nucleus nuclear energy

Modes of Energy Transfer Energy Interaction between System and Surrounding Energy can cross the boundary (transferred) by 2 methods; HEAT & WORK

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