BLG 143 Lecture Notes - Lecture 2: Net Energy Gain, Cellular Respiration, Exothermic Process
6 Jun 2019
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Document Summary
Light, heat, electromagnetic energy, mechanical energy: potential energy stored energy, an object hold ep b/c of its position within an attractive or repulsive force field (ex. Gravitational ep, chemical ep: work the transfer of energy from one body/place to another. Metabolism: catabolic rxn breakdown of complex substances, anabolic rxn building complex substances, metabolism sum of all catabolic and anabolic rxns. Thermodynamics: 1st law of thermodynamics - the total amount of energy in the universe is constant. Photosynthesis plant absorbs light energy from sun which is transformed into chemical energy and stored in bonds that hold together atoms in a sugar molecule. When methane burns, the c-h bonds break and c=o bonds form and o-h bonds form: energy is measured in kj/mol. Enthalpy: the overall change in energy in a chemical rxn, h positive = endothermic, h negative = exothermic, h = [energy required to break bonds in reactants] - [energy released in bond forming of products]
