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Unformatted text preview: ed yielding an ionic bond (c). Types of Covalent Compounds How can you tell if one molecule is polar and another is not polar? ElectronegaCvity: a measure of an atom’s a>racCon for the electrons it shares in a covalent bond. Polar covalent bond: a covalent bond in which the electrons are not equally shared, but rather displaced toward the more electronegaCve atom. How can you tell if one molecule is polar and another is not polar? All we have done to this point is decide if a bond is polar or nonpolar. Take a close look at the two familiar molecules on the next slide and decide. Both are Covalent Compounds – Are they polar or nonpolar? Rules for deciding if molecules are polar or nonpolar: 1. Determine Lewis structure 2. Determine molecular geometry. 3. IdenCfy polar bonds. 4. Determine molecular symmetry. (hint look for a nonbonding pair of electrons on central atom) 5. If the molecule contains polar bonds and is asymmetric, the molecule is polar. State whether the following molecules are polar or nonpolar: PracCce in small groups. CH4, CH3OH, C6H14, CHCl3, NO2, N2, O3, NH3, H2, HF, NaCl Water as a Solvent Why do polar and nonpolar molecules have diﬀerent physical properCes? Unit 7 Week 5 Lecture 10 PracCce in small groups. CH4, CH3OH, C6H14, CHCl3, NO2, N2, O3, NH3, H2, HF, NaCl Intra‐molecular Forces versus Inter‐molecular Forces Ionic versus Covalent Draw inter vs intra molecular bonds: methane water Intermolecular Forces • All are dependen...
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This note was uploaded on 03/15/2014 for the course CH 305 taught by Professor Sutcliffe during the Spring '08 term at University of Texas at Austin.
- Spring '08