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Lecture 5 - Thermodynamics & Intro to Metabolism

Lecture 5 - Thermodynamics & Intro to Metabolism -...

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9.19.07 Thermodynamics and Kinetics
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What are  the s e  thing s ?    Ho w big  are  the y?
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m ic ro tubule  (25 nm  diam e te r)  with a ve s ic le  (~ 100 nm ) g o lg i apparatus   (~ 0.5  μ m ) c e ntrio le s    (~ 0.25  μ m  diam e te r)
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Thermodynamics and Kinetics
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whic h re ac tio ns  happe n o n the ir o wn? whic h re ac tio ns  re q uire  e ne rg y input? what de te rm ine s  the  s pe e d o f a re ac tio n? thermodynamics kinetics
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Salt dissolves spontaneously salt crystal Is dissolved salt energetically more favorable than salt crystal?
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energy kinetic energy potential energy mass a property of individual atoms and molecules (E = mc 2 )
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first law of thermodynamics conservation of energy The total energy in the universe cannot change. E (universe) = a constant or: E (universe) = 0
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entropy Entropy measures the degree of disorder inherent in an ensemble of molecules. A property of an ensemble of atoms and molecules
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Consider a mole of oxygen:
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Consider a mole of oxygen:
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Consider a mole of oxygen: LOW ENTROPY – (NOT VERY RANDOM…)
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Consider a mole of oxygen: HIGHER ENTROPY – (MORE RANDOM…)
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Consider a mole of oxygen: MAXIMAL ENTROPY – (MOST RANDOM…)
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second law of thermodynamics increase of entropy The total entropy of the universe cannot decrease.
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