unit-3-review-answers

unit-3-review-answers - 1. HCl = 3.0 2.1 = 0.9:...

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1. HCl = 3.0 – 2.1 = 0.9: dipole-dipole, London. H 2 O = 3.5 – 2.1 = 1.4: hydrogen bonding (H with N, O, or F), London. NaCl = 3.0 – 0.9 = 2.1: ionic, London. CH 4 = 2.5 – 2.1 = 0.4: London only. 2. a) Solubility is a balance between attractive forces and the speed of molecules. Oil doesn’t mix with water because the speed of the oil molecules is not sufficient to break through the attractive forces of the water. Water offers less resistance to molecules of HCl since water has a greater attraction for HCl than it has for oil. Thus, the speed of the HCl molecules is sufficient to break through
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warmer water because water molecules move faster at higher temperatures. Unlike solids, dissolved gases can leave the surface of a liquid. The higher the temperature, the faster the gas (and liquid) molecules are traveling. This gives a larger percentage of the gas molecules the speed they need to escape the surface of the liquid (thus, gases have a lower solubility at higher temperatures). 3. 12 % V/V = 12 mL/100 mL, 12 L/100 L, etc.
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This note was uploaded on 11/09/2011 for the course CHEM 110 taught by Professor Sullivan during the Fall '10 term at BYU.

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unit-3-review-answers - 1. HCl = 3.0 2.1 = 0.9:...

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