Quiz 1 - Version 124 Quiz 1 Laude(52455 This print-out...

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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) Δ H dissolution II) Δ H lattice III) Δ 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: Δ H lattice describes the ammount of energy required to disurpt the crystal lattice of the salt. Overcoming the coulombic attraction that holds the cystal’s ions together is en- dothermic, positive. 002 5.0 points Which of the following would not result in a phase transition? 0 200 400 600 800 1000 0 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 475 K to 50 K Explanation: 003 5.0 points Consider dissolving gases in water. Which of
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