CHM 2045 WK13 HO1 Dalia Soueid Answers PDF PDF

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chem 1 week 13 review...

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CHM 2045 Week 13 SI Handout 1 SI Leader: Dalia Soueid [email protected]

Sessions:

M 7:00-7:50pm in PA 101 T 4:00-4:50pm in PS109 W 1:30-2:20pm GS226 & 11:00-11:50am GS222 R 4:00-4:50pm GS222 & 6:30-7:20pm GS222

Bond Polarity and Electronegativity When two dissimilar atoms form a covalent bond, the electron pair will be unequally shared resulting in a dipole moment a bond in which the two atoms have partial charges. Ex. HI When two atoms do not equally share electrons, one atom has the larger share of electrons (partially negative, d) and the other atom is depleted of the electrons (partially positive, d+) this is called a polar bond. In ionic bonds the displacement of the electrons to one of the two atoms is essentially complete. + and – symbols are written alongside the atoms. Ex. LiF

Electronegativity is the ability of an atom in a molecule to attract electrons to itself.

Which bond listed below is the most polar? C – Cl B – Cl Al – Cl Si – Cl

Molecular Polarity Most molecules have polar bonds, molecules can also be polar. 1. Symmetrical molecules with no lone pairs are always nonpolar 2. Symmetrical molecules with different atoms are polar 3. If one position is occupied by a lone pair in a molecule, the molecule will be polar 4. If there are two or more lone pairs, sometimes the molecule is polar and sometimes it is nonpolar

Decide whether the following molecules contain any polar bonds, then whether the molecule as a whole is polar or nonpolar. NOBr CSe2

SF6

Which of the hydrogen halides is the most polar? A) HF B) HCl C) HBr D) HI

Which molecules listed below is nonpolar? A) BCl3 B) PCl3 C) POCl3 D) SO2Cl2

SeH2...