CHEM 11H Lecture Notes - Lecture 8: State Function, Thermal Energy, Electric Light
1 Nov 2017
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Document Summary
World population consumes ~18 tw (terawatts) in 2013 (t = 1012) 1 tw = 10 billion 100 w lightbulb at the same time. 80% from fossil fuel produces co2 greenhouse gas. Need to understand relationship between chemical change and energy. Thermodynamics: study of energy and its transformations. Thermochemistry: about heat absorbed/released during chemical change. Energy: capacity to do work or to produce heat, units joule (j) or calorie (cal) Work = force acting over a distance, w = f x d. Heat: transfer of energy between 2 objects due to temperature difference. Potential energy: due to position of composition (gravitational, elastic, chemical, electrostatic) Kinetic energy: due to motion, depends on mass, ke = mv2. Thermal energy: motions of atoms & molecules temperature. 1st law of thermodynamics: energy can be converted to one form to another, but can be neither created nor destroyed. Systems vs. surroundings - track energy changes (no energy lost in transfer)
