Homework 4-solutions

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

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Unformatted text preview: alexander (jra2623) – Homework 4 – sutcliffe – (51045) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – find all choices before 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 shift if the vol- ume of the container is decreased? 1. You must know the actual volume to tell. 2. left ← correct 3. → right 4. no net shift Explanation: A volume decrease is the same as a pressure increase. The equilibrium will shift to the side with the fewest gas moles which is to the left. Also, the value of Q would be greater than K so the reaction would shift left. 002 (part 2 of 2) 10.0 points How does the equilibrium shift when temper- ature is increased? 1. → right correct 2. no net shift 3. It depends on whether it is on the Kelvin or Celsius scale. 4. left ← Explanation: Because the reaction is ENDOthermic, an increase in temperature would “push” the reaction forward. The equilibrium constant would increase as a result. 003 10.0 points What is the effect of 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 shift toward products or reactants with a temperature increase. 1. I shifts toward products and II shifts to- ward reactants. 2. Unable to determine 3. Both I and II shift toward reactants. correct 4. Both I and II shift toward products. 5. I shifts toward reactants and II shifts toward products. Explanation: If a reaction is exothermic, raising the tem- perature will tend to shift the reaction toward reactants; whereas if the reaction is endother- mic, a shift toward products will be observed. Reaction I is exothermic; raising the tem- perature should favor the formation of reac- tants. Reaction II is exothermic; raising the temperature should favor the formation of re- actants. alexander (jra2623) – Homework 4 – sutcliffe – (51045) 2 005 10.0 points When the reaction CO 2 (g) + H 2 (g) ⇀ ↽ H 2 O(g) + CO(g) is at equilibrium at 1800...
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This note was uploaded on 10/20/2011 for the course CH 302 taught by Professor Holcombe during the Fall '07 term at University of Texas.

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

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