Homework 4-solutions

# Homework 4-solutions - alexander(jra2623 Homework 4...

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alexander (jra2623) – Homework 4 – sutclife – (51045) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – Fnd all choices be±ore answering. 001 (part 1 of 2) 10.0 points Consider the reaction 22 . 1 kcal + PCl 5 (g) PCl 3 (g) + Cl 2 (g) How does the equilibrium shi±t i± the vol- ume o± the container is decreased? 1. You must know the actual volume to tell. 2. le±t correct 3. right 4. no net shi±t Explanation: A volume decrease is the same as a pressure increase. The equilibrium will shi±t to the side with the ±ewest gas moles which is to the le±t. Also, the value o± Q would be greater than K so the reaction would shi±t le±t. 002 (part 2 of 2) 10.0 points How does the equilibrium shi±t when temper- ature is increased? 1. right correct 2. no net shi±t 3. It depends on whether it is on the Kelvin or Celsius scale. 4. le±t Explanation: Because the reaction is ENDOthermic, an increase in temperature would “push” the reaction ±orward. The equilibrium constant would increase as a result. 003 10.0 points What is the efect o± a volume decrease on the reaction C(s) + H 2 O(g) CO(g) + H 2 (g) ? 1. K decreases. 2. no change 3. K increases. 4. More CO(g) and H 2 (g) are produced. 5. More H 2 O(g) are produced. correct Explanation: 004 10.0 points Predict whether the equilibria I) CO(g) + H 2 O(g) CO 2 (g) + H 2 (g) , Δ H = - 41 kJ II) 2 SO 2 (g) + O 2 2 SO 3 (g) , Δ H = - 198 kJ will shi±t toward products or reactants with a temperature increase. 1. I shi±ts toward products and II shi±ts to- ward reactants. 2. Unable to determine 3. Both I and II shi±t toward reactants. correct 4. Both I and II shi±t toward products. 5. I shi±ts toward reactants and II shi±ts toward products. Explanation: I± a reaction is exothermic, raising the tem- perature will tend to shi±t the reaction toward reactants; whereas i± the reaction is endother- mic, a shi±t toward products will be observed. Reaction I is exothermic; raising the tem- perature should ±avor the ±ormation o± reac- tants. Reaction II is exothermic; raising the temperature should ±avor the ±ormation o± re- actants.

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alexander (jra2623) – Homework 4 – sutclife – (51045) 2 005 10.0 points When the reaction CO 2 (g) + H 2 (g) H 2 O(g) + CO(g)
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Homework 4-solutions - alexander(jra2623 Homework 4...

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