CHM 2045 Lecture Notes - Lecture 1: Bromine, Molecule, Diatomic Molecule
14 Jan 2016
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Addition and subtraction: the answer cannot have more digits past the decimal point than the factor being added/subtracted with the least amount. Ex) 20 + 2. 8 = 23 not 22. 8 because 20 does not have any numbers past the decimal point. Multiplication and division significant figures: the answer cannot exceed the factor with the lowest number of. Scientific notation: 1 x 10^-2 = 1 significant figure, 1. 0 x 10^-2 = 2 significant figures, 0. 01 x 10^-2 = 1 significant figure, 0. 010 x 10^-2 = 2 significant figures. Came up with the atomoic model with indivisible atoms . Laws of multiple proportions and definite composition: compounds had to have whole numbers, h2o not h(1. 97)o. Said that there had to be conservation of mass in reactions. Said that atoms are divisible: protons, neutrons, electrons (subatomic particles) Mass and charge ratio of electrons is -1. 76 x 10^-19. Offered the plum pudding model for the atom.
