Compounds and Formulas
Compounds and Formulas Chem 121
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This 2 page Class Notes was uploaded by Pamela Crockett on Wednesday October 5, 2016. The Class Notes belongs to Chem 121 at University of North Dakota taught by David Pierce in Fall 2016. Since its upload, it has received 15 views.
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Date Created: 10/05/16
Atoms and Ionic Bonds Matter: Mixtures and Pure Substances Mixtures: Heterogeneous and Homogeneous Pure Substances: Elements and Chemical (83) Compounds (120 million) A compound is composed of two or more elements in definite proportions held together by chemical bonds…distinguished by its elements and bonds. Molecular Compounds Single neutral group (molecule) Held together by covalent bonds (shared electrons) Usually nonmetals H2: diatomic element…NOT a compound Ionic Compounds Not individual molecules Paired cations (+) and anions (-) Held together by ionic bonds Usually metal and nonmetal Organic Compounds All have C w/ H, O, N, and S Not just from living organisms Inorganic Compounds: All other elements Simple C compounds Molecules = combinations of atoms Compounds = combos of different elements Molecular compounds = greater than/equal to 2 non-metal atoms Ionic = cations + anions Chemical Formulas …How we write the “words” of chemistry… PCl3…CO2…ClO2…H2O2 DOES NOT EQUAL HO Molecular and structural formulas (center element with lines) Ball and stick model (elements as balls with attached sticks to other elements) Space filling model (bubbles) Formulas for ionic compounds… MUST be empirical MUST be neutral overall Mg2+ + Cl- = MgCl2 Al3+ +O2- = Al2O3
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