CH03 MSJ jlm - Chapter 3 Chapter Chemical Compounds Jons J....

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1 Chemical Compounds Chemical Compounds Chapter 3 Chapter 3 Jons J. Berzelius 1779-1848. Accurately determined atomic weights, used in future Periodic Table. Originated modern chemical formulas, including “K” and “Na” for potassium and sodium.
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2 Molecules and Chemical Formulas Molecules and Chemical Formulas Molecules and Molecular Compounds Molecules and Molecular Compounds Molecules are assemblies of two or more atoms bonded together. Each molecule has a chemical formula . The chemical formula indicates: which atoms are found in the molecule, and in what proportion they are found. Compounds formed from molecules are molecular compounds.
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3 Molecular formulas give the actual numbers and types of atoms in a molecule. Examples: Molecules and Molecular Compounds Molecules and Molecular Compounds Molecular and Empirical Molecular and Empirical Formulas Formulas H 2 O, CO 2 , CO, CH 4 , H 2 O 2 , O 2 , O 3 , and C 2 H 4 . Empirical formulas give the relative numbers and types of atoms in a molecule. That is, they give the lowest whole number ratio of atoms in a molecule. Examples: H 2 O, CO 2 , CO, CH 4 , HO, CH 2 .
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4 Picturing Molecules Picturing Molecules Molecules occupy three dimensional space. However, we often represent them in two dimensions. The structural formula gives the connectivity between individual atoms in the molecule. The structural formula may or may not be used to show the three dimensional shape of the molecule. Molecules and Molecular Compounds Molecules and Molecular Compounds
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5 Picturing Molecules Picturing Molecules Molecules and Molecular Compounds Molecules and Molecular Compounds
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6 Different representations of methane (CH 4 )
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7 When an atom or molecule loses electrons, it becomes positively charged. Ions and Ionic Compounds Ions and Ionic Compounds For example, when Na loses an electron, it becomes Na + .
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This note was uploaded on 04/12/2011 for the course CHEM 1420 taught by Professor Acree during the Spring '08 term at North Texas.

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CH03 MSJ jlm - Chapter 3 Chapter Chemical Compounds Jons J....

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