CHEM 107 Lecture 1: Chapter 1 - Matter and Energy
25 Jul 2016
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Document Summary
Matter and energy: the origin of the universe. Pure substance: same chemical/physical properties, can"t be separated by physical process: elements, compound: 2+ pure substances bonded, broken into individual elements by chemical means. Law of constant composition: all samples of particular compound contain the same elements in same proportions (ex. Separating mixtures: isolated by physical means: filtration, distillation: separate volatile components (ex. alcohol/water, alcohol has lower boiling point) vaporized and condense, separates more volatile and less volatile components. September 3-9, 2015: atom: smallest, retains chemical characteristics of that element, molecule: collection of chemically bonded atoms, chemical formula: notation to represent elements/compounds, symbols to represent elements, subscripts to identify number of atoms of each element. States of matter: solids: de nite shape/volume, liquids: de nite volume, gasses (vapors): no de nite shape or volume. Scienti c method: hypothesis: tentative and testable explanation for observation, scienti c theory: general explanation of widely observed phenomena.
