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Lecture 2

CHEM H90 Lecture 2: Classifying Matter and Its State (04/05/17)

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University of California - Irvine

LECTURE 2 Wednesday, April 6, 2017 Classifying Matter and Its State Advanced Understanding? You have a lot more information, but its much harder to parse it out Truth is a very complex matter in social sciences o In sciences, its a less complex matter but still has some questions Scientific Method o Observation o (e.g.) Apple falls from the tree Representation o (e.g.) Newton and modern physics, detailed description of phenomena after frank observation Interpretation o (e.g.) Newtons law of gravity o Is interpretation true under all conditions? Models of collecting information, simplifying findings and finding general rules, theories Scientific method? Sherwood Rowland, Nobel Laureate: o Chemicals expelled into the atmosphere can have pronounced climate effects With ultraviolet light, fluorite atoms affect the ozone layer Rush Limbaugh, Radio Host: o Greenhouse effect is utter nonsense Pioneers of Chemical Science Robert Boyle (16271691) o Gas laws o Compounds and mixtures Corpuscular theory of matter Antoine Lavoisier (17431794) o Conservation of mass Add up the mass of the ingredients that went in and figure out the mass of what came out Some of that is gas, but captured in a big bottle Keeping track of everything o Disproving phlogiston theory Before, people had a more alchemycentered theory of chemistry o Hydrogen, oxygen, various elements Regarded as the start of modern chemistry
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