Biology 1002B Lecture Notes - Lecture 5: Thermodynamics, Exothermic Process, Enthalpy
15 Mar 2015
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Document Summary
Energy: energy possessed by an object because it is in motion. Potential/chemical potential: stored energy: the energy an object has because of its location or chemical structure. System: object being studied, three types. Isolated system: does not exchanged matter or energy with surroundings, ex. Insulated thermos bottle: can exchange energy but not matter with surroundings, ex. Open system: both matter and energy can move freely between system and surroundings, ex. Energy can be transformed from one form into another or transferred from one place to another, but it cannot be created or destroyed. Energy transformations are not always efficient: energy is lost and unable to do work, lost in the form of heat (random molecular motion) Every energy transformation increases the disorder/randomness of the universe (entropy) Disorder of an isolated system always increase (entropy) Quality of all life: highly ordered: ex. Living cells = open systems: exchanging energy and matter with surroundings and use that to generate order.
