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Lecture 3

Lecture 3 – Introduction to Thermodynamics.docx

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Department
Life Sciences
Course
Life Sciences 1a
Professor
Robert Lue
Semester
Fall

Description
Sept 10 – Introduction to Thermodynamics ­ cannot explain life by forces acting on molecules ­ all forces are electrostatic and identical in cell or flask  ­ all living things have to be able to create movement  ­ energy  ▯work  ▯movement  ­ rearrangement of bonds  ▯favorable or unfavorable  ­ cell is dead if it reaches equilibrium  ­ energy required for metabolism, making new molecules  ­ law believed to be true, explains enormous amount of phenomena ­ not proved to be true but not disproven either st ­ 1  law of thermodynamics: energy cannot be created or destroyed ­ ex: ice melting  ▯thermal energy converted to kinetic energy  ­ not easy to convert one form of energy to another, energy is always lost ­ rearrangement of bonds releases chemical energy ­ cells store energy in ATP ­ conversion of glucose + oxygen to carbon dioxide + water is favorable and  spontaneous, reaches more stable state and releases energy ­ can’t measure amount of energy of  individual molecules ­ equilibrium: rates are equal, concentration of reactant and product no longer  changing ­ CO2 produced by burning fuel, greenhouse effect, acidic rain/oceans, creatures in  ocean dissolve  ­ Keq = [product
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