Chemical Reactions, Atomic Structure

Chemical Reactions, Atomic Structure - o Surrounded by...

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Chemical Reactions, Atomic Structure Molecules : Combination of a fixed number of atoms held together in a certain geometric arrangement Chemical formulas : symbolic representations of the elementary composition of chemical compounds Chemical Reactions : atoms are arranged in different compounds: Reactants are transformed into products C+O 2 C0 2 Carbon + Oxygen Carbon Dioxide In any chemical reaction, mass is conserved: Law of Conservation of Mass o CH4+ 2O2 CO2 + 2H2O o C3H8 + 3O2 3CO2+4H20 Characteristics of Chemical Equations Always conserved o Identity of atoms in reactants = identity of atoms in products o Number of atoms in reactants= o Mass of all reactants= May change o Number of molecules in reactants maybe different than products o Physical states Atomic structure Modern view of the atom o Positively charged nucleus
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Unformatted text preview: o Surrounded by negatively charged electrons o Size of atoms • Nucleus: contains two types of subatomic particles: o Protons: positively charged o Neutrons: not charged o Protons and neutrons make up nearly all the mass of an atom, but they accupy only a very small percentage of area Hydrogen In an electrically neutral atom, the number of electrons equals the number of protons The rows and columns are defined by the distribution of electrons in defined shells or energy levels surrounding the nucleus Valence electrons Lewis dot representation: dots represent valence electrons, the electrons that interact with outside environment Same valence electrons= same chemical properties, same column= same number of valence electrons Core electrons = all electrons - valence...
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This note was uploaded on 02/17/2011 for the course CHEM 004 taught by Professor Zysmilich during the Spring '06 term at GWU.

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