CHEM 1103 Study Guide - Midterm Guide: Valence Bond Theory, Trigonal Bipyramidal Molecular Geometry, Molecule
27 Nov 2016
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The mass percent composition of a compound indicates each element"s percentage of the total compound"s mass. We can determine the mass percent composition from the compound"s chemical formula and the molar masses of its elements. If we know the mass percent composition and molar mass of a compound, we can determine its empirical and molecular formulas. The shared electrons in a covalent bond are not always equally shared; when two dissimilar nonmetals form a covalent bond, the electron density is greater on the more electronegative element. The result is a polar bond, with one element carrying a partial positive charge and the other a partial negative charge. Electronegativity the ability of an atom to attract electrons to itself in chemical bonding increases as we move across a period to the right in the periodic table and decreases as we move down a column.
