Chemistry 1A Atoms, Ions, and Molecules
Chemistry 1A Atoms, Ions, and Molecules Chem 1A
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This 1 page Class Notes was uploaded by Renee ODonnell on Wednesday September 28, 2016. The Class Notes belongs to Chem 1A at University of California Santa Barbara taught by Price in Summer 2016. Since its upload, it has received 3 views.
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Date Created: 09/28/16
Chemistry 1A Week 2 Lecture 2 Chemistry: the science that seeks to understand what matter does by studying what atoms and molecules do Matter: anything that occupies space and has mass Scientific Method • Phenomena/Question/Problem • Perform Experiments • Identify Pattern • Determine evidence-based explanations for data • Design more experiments • Revise experiment to fit data Law: a summary of an extensive series of observations: explains what happens Theory: a collection of ideas and concepts used to account for a scientific law: explains why it happens Law of Conservation of Mass: reactants(m) = products(m) Law of Definite Proportions: when two or more elements combine to form a compound, their masses in that compound are in a fixed and defined ratio Law of Multiple Proportions: when two elements form a series of compounds, the ratio of the masses of the second element that combined with one gram of the first element can always be reduced to a smaller ratio Dante’s Model 1808 • each element is made up of atoms • each atom of a given element is the same • chemical compounds = many atoms put together Mass of Electrons: 9.109 x 10^-31 Change of Electrons: -1.602 x 10^-19 # of protons = # of electrons # of neutrons can vary Isotope: atoms with same # of protons but different # of neutrons Mass # Atomic ELEMENT SYMBOL
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