CollPropPTKey - AP Chemistry Bonding and Colligative...

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AP Chemistry Name:________________ Bonding and Colligative Properties Practice Test 1. Account for each of the following observations about pairs of substances. In your answers, you must make reference to BOTH substances. Use appropriate principles of chemical bonding and/or intermolecular forces in your answers. Lewis dot structures may be helpful in some cases. 2. A 20.0 g sample of methyl alcohol (CH 3 OH, molar mass 32.0 g/mol) was dissolved in 30.0 g of water. What is the mole fraction of CH 3 OH? 3 3 2 2 2 3 20.0 g CH OH 1 mole 0.625 moles of CH OH 32.0 g 30.0 g H O 1 mole 1.67 moles of H O 18.0 g 0.625 moles methanol 0.272 1.67 moles H O +.625 moles CH OH = = = 3. Which of the following concentration measures will change in value as the
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temperature of a solution changes? Answer: d a. mass percent b. mole fraction c. molality d. molarity e. all of these 4. Rank the following compounds according to increasing solubility in water. I. CH 3 -CH 2 -CH 2 -CH 3 II. CH 3 -CH 2 -O-CH 2 -CH 3 III. CH 3 -CH 2 -OH IV. CH 3 -OH Answer: d a. I< III<IV<II b. I<II<IV<III c. III<IV<II<I d. I<II<III<IV e. no order is correct 5. The vapor pressure of water at 25.0 o C is 23.8 torr. Determine the mass of glucose (molar mass = 180 g/mol) needed to add to 500.0 g of water to change the vapor pressure to 23.1 torr. We did this in class. Use the vapor pressure lowering formula to find the mole fraction of glucose in the solution and use that to find the mass of glucose. 6. A solution is prepared from 31.4 g of a nonvolatile, nondissociating solute and 85.0 g of water. The vapor pressure of the solution at 60 o C is 142 torr. The vapor pressure of water at 60 o C is 150. torr. What is the molar mass of the solute? This we did in class also. It’s the same idea as number 5. Use the vapor pressure lowering
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This note was uploaded on 01/15/2012 for the course CHEM 101 taught by Professor Curtis during the Spring '11 term at Austin Community College.

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CollPropPTKey - AP Chemistry Bonding and Colligative...

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