01:119:115 Lecture Notes - Lecture 7: Covalent Bond, Energy Transformation, Chemical Energy
24 Dec 2015
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September 23, 2014: metabolism, sum of all chemical reactions and energy transformations carried out in an organism, regulated maintain homeostasis (balanced internal environment even external, emergent property, types environment changes, anabolism. Energy (e)- capacity to do work: forms [fig 8. 2, kinetic- motion, potential-stored energy, first law- energy cannot be created or destroyed, laws of thermodynamics. Low entropy and is usable universe) moving particles. High entropy: energy conversion is never 100% efficient. *based on laws 1 & 2 total amount of energy in universe is not changing. Some energy dispersed as heat (increase entropy) ex: car engine 20-30% efficient --rest is dispersed as cells 40% efficient --rest is dispersed as heat. But total amount available to do work is decreasing. Chemical reactions of life: ultimate source of energy sun, cellular work, mechanical, transport, chemical, potential energy- stored in the covalent bond of high energy, forms of energy in a cell molecules. *only type of energy that can do cell work*
