Biology September-24-08

Biology September-24-08 - Biology Energy and Thermodynamics...

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Biology – Energy and Thermodynamics September-24-08 Energy – The capacity to do work Types of Energy: kinetic (energy due to movement), potential (stored energy of an object due to chemical composition or position), chemical-potential (energy associated with molecules [food]) Energy systems: Closed system - matter doesn’t exchange with surroundings, energy can only move in and out. (Ex. Planet earth) Open system – both matter and energy can be exchanged between the system and surroundings. (Ex. Plant) Isolated system – a system where neither energy nor matter can move back and forth is an isolated system. (Ex. A perfect thermos)
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Laws of Thermodynamics 1 st Law of Thermodynamics - Total energy in the universe is constant, you cannot create new energy, only change the form of existing energy. 2 nd Law of Thermodynamics – Energy transformations are never 100% efficient. You will always lose energy in a transformation. Entropy – Increase in disorder and randomness. Entropy of a system and surroundings
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This note was uploaded on 04/04/2009 for the course BIOLOGY 1222 taught by Professor Haffie during the Spring '09 term at UWO.

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Biology September-24-08 - Biology Energy and Thermodynamics...

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