CHEM 101 Lecture Notes - Lecture 2: Dimensional Analysis, Binding Energy, Molar Mass
13 Oct 2016
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Intensive physical property= does not depend on the amount of matter in substance. Extensive physical property= does depend on the amount of matter in a substance. Chemical property=quality that can only be established by changing a substance"s chemical identity (ex. Physical property= used to describe the original composition of a substance (ex. Unit equations convert from one unit of measurement to another. Information given x conversion factor(s) = information sought. Avogadro"s number: an approximation based on carbon-12. ^conversion factor used in chemistry usually references x mol of atoms. 1 mol k atoms (the conversion factor) ^^^same thing works for molecules, but mass is the molar mass aka the combined atomic masses of the molecule multiplied by their frequency in the molecule (ex. In water, hydrogen appears twice and oxygen appears once) Use atomic mass for 1 element or an atom. Use molar mass for compounds, molecules, diatomics, etc. Main idea: microscopic/nanoscopic particles behave much differently than macroscopic particles.
