chem107f09wk1S

chem107f09wk1S - Roots of Chemistry Alchemy...

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Roots of Chemistry Alchemy
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Chemistry Physics, Astronomy Materials Engineering Medicine Earth Sciences Life Sciences Interdisciplinary Nature of Chemistry The Central Science
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Chemists observe macroscopic systems and try to visualize the events at the molecular level that are responsible for the observed properties or changes. Chemistry can be divided into 5 sub disciplines: organic chemistry inorganic chemistry physical chemistry biological chemistry analytical chemistry Chemistry: Definition Chp. 1.2
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Compounds Elements Matter Mixtures Pure Substances Heterogeneous Mixtures Homogeneous Mixtures (Solutions) separation by physical methods separation by chemical methods Classification of Matter Chp. 1.2
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+ Chemical and Physical Changes Chp. 1.2 A B S Fe D C
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Solid gas Liquid States of Matter Chp. 1.2
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Physical Properties can be measured or observed without changing the composition or identity of the substance. ex: density, conductivity, melting point, color, hardness Chemical Properties – describe the way a substance may change or react to form other substances ex: flammability, corrosivity, reactivity Chemical equations describe chemical changes (reactions). Physical and Chemical Properties of Matter Chp. 1.2
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electron cloud is not drawn to scale Particle Mass (g) Charge (C) Charge Unit Electron 9.10939 x 10 -28 -1.6022 x 10 -19 -1 Proton 1.67262 x 10 -24 +1.6022 x 10 -19 +1 Neutron 1.67493 x 10 -24 00 Atomic Structure Chp. 2.2
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Ti 22 48 X Z A Atomic Number Z = number of protons (p) In a neutral atom the number of electrons (e) = the number of protons (p)
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This note was uploaded on 02/23/2010 for the course CHEM 107 taught by Professor Generalchemforeng during the Fall '07 term at Texas A&M.

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chem107f09wk1S - Roots of Chemistry Alchemy...

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