HSS 2305 Chapter Notes - Chapter 3: Thermodynamic System, Chemical Energy, Thermodynamics

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Enzymes complex protein architecture leads to increase rates of biological reaction. A living cell does a lot of activity, needs to acquire energy in order to expend it. Bioenergetics: study of energy transformation in a living organism. Energy capacity to do work, change or move things. First law of thermodynamics (conservation of energy) energy can be neither created or destroyed but can be converted into different forms (transduction) i. e chemical energy in atp mechanical energy as organelle move about cell. Chemical energy is converted (transduction) to mechanical and thermal energy: = ; where e = internal energy, q = heat energy, w = work energy, endothermic >0 reactions that gain heat delta; exothermic <0 reactions that lose heat. T is the absolute temperature in k (k = c + 273), which can affect spontaneous reaction. Biomed relevance: understanding chemical reactions requires basic comprehension of physics, chm proper, molecules randomly bouncing around.

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