CH102 Mock Exam 1 Spring 2009

CH102 Mock Exam 1 - Clemson University CH102 Spring 2009 Mock Exam 1 1 What phase(s exists at point A in the phase diagram below 4 Use the

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Page 1 of 6 A Clemson University CH102 Spring 2009 Mock Exam 1 1. What phase(s) exists at point A in the phase diagram below? A. Solid D. Solid & Liquid B. Liquid E. Liquid & Gas C. Gas 2. The following phase diagram of elemental carbon has three different solid phases in the region shown. How many triple points does carbon have based on the phase diagram given? A. 1 B. 2 C. 3 D. 4 3. Which of the following solids has a very high melting point and as a liquid is non-conducting? A. Na 2 SO 4 B. H 2 SO 4 C. SiC D. Na 4. Use the solubility curve for sodium nitrite, NaNO 2 , to answer the following question. A solution is prepared by dissolving 60 kg of sodium nitrite in 50 kg of water at 80 ° C and the resulting solution is cooled to 30 ° C. Which of the following is true? A. The cooled solution is unsaturated. B. 90 kg of sodium nitrate is contained in the cooled solution. C. 60 kg of sodium nitrate is contained in the cooled solution. D. 45 kg of sodium nitrate is contained in the cooled solution. E. The amount of solute in solution cannot be determined. 5. Which one of the following substances crystallizes as a molecular solid? A. KI D. CH 3 OH B. SiO 2 E. Al 2 (SO 4 ) 3 C. Sn 6. What is the freezing point of a solution prepared from 50.0 g ethylene glycol (C 2 H 6 O 2 ) and 85.0 g H 2 O? A. 17.6 ° C D. 1.50 ° C B. 176 ° C E. 17.6 ° C C. 1.50 ° C 7. Which molecule has the highest melting point? A. HOCH 2 CH 2 CH 2 OH B. CH 3 (CH 2 ) 5 CH 3 C. CH 3 CH 2 CH 2 CH 2 OH D. CH 3 OCH 2 CH 2 CH 3
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Page 2 of 6 8. How much heat must be removed to completely convert 27.0 g of steam at 100 ° C to ice at 0 ° C? For water: H 2 O (s): C s = 2.09 J/(g • ° C) H 2 O (l): C s = 4.18 J/(g • ° C) H 2 O (v): C s = 2.01 J/(g • ° C) Δ H fus = 6.02 kJ/mol Δ H vap = 40.67 kJ/mol A. 70.0 kJ D. 1270 kJ B. 71.0 kJ E. 1280 kJ C. 81.3 kJ 9. Which of the following represents a carboxylic acid? A. CH 3 CH 2 -O-CH 3 B. CH 3 CH 2 CH 2 -OH C. CH 3 CH 2 COOH D. CH 3 CH 2 -NH 2 10. Which of the following increases the solubility of a gas in a given solvent? A. increasing the partial pressure of the gas B. increasing the temperature of the solvent C. both A and B D. decreasing the temperature of the solvent E. both A and D 11. Which of the following statements about water, H 2 O, is true?
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This note was uploaded on 04/03/2009 for the course CH 102 taught by Professor Staff during the Spring '08 term at Clemson.

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CH102 Mock Exam 1 - Clemson University CH102 Spring 2009 Mock Exam 1 1 What phase(s exists at point A in the phase diagram below 4 Use the

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