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Unformatted text preview: Version 124 Quiz 1 Laude (52455) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 5.0 points When dissolving salts in water which of the following values is always positive? I) H dissolution II) H lattice III) H hydration 1. II, III 2. I only 3. I, II, III 4. III only 5. I, III 6. II only correct 7. I, II Explanation: H lattice describes the ammount of energy required to disurpt the crystal lattice of the salt. Overcoming the coulombic attraction that holds the cystals ions together is en- dothermic, positive. 002 5.0 points Which of the following would not result in a phase transition? b 200 400 600 800 1000 20 40 60 80 100 Pressure,atm Temperature, K 1. at 800 K, decreasing the pressure from 90 to 20 atm correct 2. at 275 K, increasing the pressure from 5 atm to 50 atm 3. at 10 atm, raising the temperature from 0 K to 275 K 4. at 45 atm, lowering the temperature from...
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This note was uploaded on 05/11/2010 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.
- Spring '07