IMF Problems - Intermolecular Forces and Physical...

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Intermolecular Forces and Physical Properties – Some Practice Problems
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Rank the Intermolecular Force (IMF) strength of the following compounds from strongest to weakest. PCl 3 , NiCl 2 , I 2 , HF
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Ranking according to ion-ion > hydrogen bond > dipole-dipole > dispersion, the ranking of the four substances is • NiCl 2 > HF > PCl 3 > I 2
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Rank the following ionic compounds according to the strength of their ion-ion forces of attraction (these are not intermolecular forces, but are intramolecular forces of ionic bonding): NiCl 2 , Fe 2 O 3 , MgO, KI, CrCl 3
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First, look at the charges on the ions that make up each compound. • NiCl 2 = Ni 2+ and Cl Fe 2 O 3 = Fe 3+ and O -2 MgO = Mg 2+ and O -2 KI = K + and I -1 • CrCl 3 = Cr 3+ and Cl -1
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Ranking according to charge, the order is • Fe 2 O 3 > MgO > CrCl 3 > NiCl 2 > KI • Note that MgO is greater than CrCl 3 , even though +3 > +2. If you multiply the charges, 2(2) = 4, which is greater than 3(1) = 3. The subscripts do not contribute to this decision.
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Rank the following from strongest to weakest intermolecular forces. • Cl 2 , CH 4 , BF 3 , SCl 2 , CO 2
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• All these compounds, except SCl 2 , are nonpolar. SCl 2 has two lone pairs on the central atom of sulfur. Its molecular geometry is bent. Consequently, this compound has dipole-dipole forces of attraction and will be stronger than the other choices. The other choices are ranked based on molar mass. The molar mass of Cl 2 = 70.91 g/mol, CH 4 = 16.05 g/mol, BF 3 = 67.81 g/mol, CO 2 = 44.01 g/mol. The higher molar mass will be stronger, so • SCl 2 > Cl 2 > BF 3 > CO 2 > CH 4
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Which of the following compounds have a high solubility in water? • SCl 2 O 2 NaCl • CO 2 • PH 3
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SCl 2 is a polar molecule with a bent geometry. Therefore it will dissolve well in water . O
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This note was uploaded on 07/15/2011 for the course CHEM 2045 taught by Professor Gower during the Spring '11 term at University of Florida.

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IMF Problems - Intermolecular Forces and Physical...

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