CHM 131 Study Guide - Final Guide: Van Der Waals Force, Molar Mass, Chemical Formula
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19 Dec 2016
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Atomic number: # of protons, determines what type of element. Mass number: # of protons + # of neutrons. It is actually the average of the elements isotopes. Isotopes: the same element with a varying amount of neutrons, most have similar properties. Isomers: the same molecular formula but a different structure, giving it different properties. Ions: charged atoms: cations positively charged atoms; anions negatively charged atoms. Interaction of non-polar substance in the presence of polar 1 2. Ionic and polar molecules are caused by en. Trend: more protons, more en; further the electron being shared, the less en. Controlled experiment: manipulates variables to see effect. Comparative experiment: compares un-manipulated data from many sources: determine statistical significance. Greeks talking about the four elements; the big question was whether mass was infinitely divisible or whether there were atomos (atoms) Next 2000 years, alchemy these were phonies, but did discover how to prepare mineral acids.
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