102Stoichiometry

102Stoichiometry - Stoichiometry Chapters 1, 2, 3 and 4...

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1 Lesson 2 Stoichiometry Chapters 1, 2, 3 and 4 (Petrucci et al.) Lesson 2 Review of basic definitions Element: composed of identical atoms that cannot be decomposed into simpler substances by chemical methods. Ex: carbon, gold, chlorine. Atom: the smallest unit that maintains the properties of the element. Isotope: atoms of the same element having different atomic masses, i.e. same number of protons (atomic number), but different number of neutrons. Ex: 12 C, 13 C, 14 C Compound: atoms bonded together in fixed proportions . Compounds can be decomposed into elements by chemical methods. Ex: water - H 2 O, sodium chloride - NaCl, acetic acid - CH 3 COOH Substance: can not be separated by physical means into portions that have different properties. Substances are formed of elements or compounds. Mixture: formed by the physical combination of two or more compounds or elements (substances). Mixtures can be homogeneous (single-phase) or heterogeneous (multi-phase). Lesson 2
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This note was uploaded on 11/29/2011 for the course CHE 102 taught by Professor Simon during the Fall '08 term at Waterloo.

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102Stoichiometry - Stoichiometry Chapters 1, 2, 3 and 4...

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