R04-A - CHEM 111 Recitation Week 9 March 25th & 27th,...

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CHEM 111 Recitation Week 9 Name: March 25 th th , 2008 (10 points) Section: Some possibly useful information Selected electronegativity values: B: 2.0; N: 3.0; O: 3.5; P: 2.1; S: 2.5; Cl: 3.0 1.000 lb = 453.6 g; Avogadro’s number (N A ): 6.022 x 10 23 1. For each substance below, first label its bonds as ionic (I), polar covalent (PC), or nonpolar covalent (NC). Then indicate whether the molecules that make up the substance are polar (P) or nonpolar (N). If the substance does not contain molecules, write “X” in the corresponding space. (2 points) SrCl 2 POCl 3 BCl 3 SO 2 RbF N 2 bonds: _______ _______ _______ _______ _______ _______ molecules: _______ _______ _______ _______ _______ _______ 2. For the following bonds, indicate the polarity using polar arrows or δ +/ δ - symbols. Then rank the bonds in order of increasing polarity, with 1 being the least polar and 3 being the most polar. (1 point) Se—F Te—F Br—F 3. Intermolecular forces we have focused on include London dispersion forces (LD), dipole-
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R04-A - CHEM 111 Recitation Week 9 March 25th & 27th,...

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