5. Energy - Energy Energy - To a biologist, energy is: the...

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Energy Energy - To a biologist, energy is: the capacity to do work – the potential to cause change Forms of energy - Energy comes in many forms: o Chemical: bonds o Electromagnetic: light o Concentration gradients: dam o Heat: random molecular motion Forms of energy: potential energy - Potential energy: o Energy that has been captured and stored o Will be used in future o In biology, seen as: Concentration gradients Chemical bonds Forms of energy: Kinetic Energy - Kinetic energy: o Energy of motion, energy being used o In biology, seen as: Heat (thermal) Light mechanical First law of thermodynamics - 1 st law: conservation law - Energy cannot be created or destroyed o Energy can be converted and change form - In a closed system:
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o During an energy transaction, the amount of total energy does not change Second law of thermodynamics - 2 nd law: increasing entropy over time - Entropy = energy that cannot do work (disorder) - No energy transaction (use) is 100% efficient o Cannot completely convert heat into work o Usable energy decreases when energy transactions take place o Disorder increases Quantitative expression - Total energy = H (enthalpy) - “useful energy” = Free Energy (G) - Entropy = S (disorder) - T = absolute temperature (degrees C + 273) o Total energy = usable + unusable
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This note was uploaded on 10/24/2011 for the course BIOL 110 taught by Professor Mason during the Fall '07 term at Purdue University-West Lafayette.

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5. Energy - Energy Energy - To a biologist, energy is: the...

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