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CHEM151Take-home Q8 Key

Chemistry (MasteringChemistry Series)

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Unformatted text preview: Name Take‐Home Quiz #8 (DUE Friday October 24th, 2008) Date Score 1) Identify the intermolecular force in each of the following. (3 points) a. CH3F Polar Compound: IMF = Dipole‐dipole b. C6H14 Nonpolar Compound: IMF = London Dispersion Forces c. MgCl2 Ionic Compound: IMF = Ion‐ion d. CH2O Polar Compound: IMF = Dipole‐dipole e. HF H bonded to F: IMF = H‐bonding f. NaCl in H2O Ionic compound in a polar one: IMF = Ion‐dipole 2) Which member of each pair has a higher boiling point (i.e. stronger intermolecular force)? (2 points) a. CH3OH or CH2O ‐ Has H‐bonding which is stronger than Dipole‐dipole b. HI or HBr ‐ Iodine is bigger c. CH4 or CH3F ‐ Polar versus nonpolar d. CO2 or F2 ‐ Both nonpolar; Carbon dioxide is larger 3) Briefly define the following: ( 5 points) a. Viscosity – resistance to pour b. Surface Tension – Attraction of molecules on surface c. Sublimation – Phase change from solid to gas d. Deposition – Phase change from gas to solid e. Vaporization – Phase change from liquid to gas f. Condensation – Phase change from gas to liquid g. Triple Point – All three phase boundaries meet on phase diagram. All three phases are at equilibrium h. Critical Point – The liquid – gas boundary ends on a phase diagram i. j. Normal Boiling Point – Boiling point at a pressure of 1 atm Normal Melting Point – Melting point at a pressure of 1 atm ...
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