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February 14, 2012

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  1. February 14, 2012 AGENDA: 1 – Bell Ringer & Part. Log 2 – Cornell Notes: Electronegativity & Polarity 3 – Review Quiz 4 – Work Time Today’s Goal: Students will be able to describe how electronegativity affects polarity of bonds. Homework • Notes Practice Problems • Up-to-date Notebook • Friday is the Last Day to take Last Week’s Quiz • Last Week’s Work is due by this Friday at the latest

  2. Cornell Notes • Topic: Electronegativity and Polarity • Date: 2/14/2012 • Electronegativity (EN) is the relative ability of an atom to attract electrons in a chemical bond. • Trend: EN gets higher as you go across a period, and lower as you go down a group (except for Noble Gases). • Nonmetals are the most EN type of elements. • The most EN element is Fluorine (top right). • The least EN element is Francium (bottom left). • (Fig. 8.20, page 265)

  3. Fig. 8.20, page 265

  4. Cornell Notes (continued) • A polar covalent bondis a covalent bond where the electrons are not shared equally. It results when the elements have different electronegativities. • If the elements are exactly the same (ex: N2), then the bond is nonpolar. • If there is a very large difference in electronegativities, the bond is ionic. • (Table 8.7, page 266)

  5. Cornell Notes (continued) • A polar covalent bond results in a slight positive or negative charge on either end of the bond. • (Example on page 267, Fig. 8.22)

  6. Practice Problems: • HF • NaCl • SF6 • H2O • CH3Cl • NH3 • CS2 • CCl4 • OF2