ModelQuestion_Ch20

ModelQuestion_Ch20 - Model Questions: Chapter 20 1. A...

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Model Questions: Chapter 20 1. A reaction is spontaneous at low temperatures but nonspontaneous at high temperatures. What are the signs of the reaction’s H and S? a. H is positive and S is positive b. H is negative and S is negative c. H is negative and S is positive d. H is positive and S is negative 2. Which substance below should have the highest standard molar entropy at 298K? a. 4H 2 O (g) b. 7NH 3(l) c. 1H 2 SO 4(g) d. 5H 2(g) 3. What is the 2 nd law of thermodynamics? a. All spontaneous reactions result in the increase of the entropy of the system b. All spontaneous reactions result in the increase of the entropy of the surrounding c. All spontaneous reactions result in the increase of the entropy of the universe d. All spontaneous reactions result in the increase of the entropy of the reaction container 4. Which of the following reactions result in an increase in entropy? a. 2KClO 3(s) 2KCl (s) + 3O 2(g)
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b. NH 3(g) + HCl (g) NH 4 Cl (s) c. H 2 O (g) H 2 O (l) d. NaCl (aq) + AgNO 3(aq) NaNO 3(aq) + AgCl (s) 5. Which of the following processes result in a decrease in entropy? a. Stirring a cup of coffee b. Expanded a piston c. Melting ice cream d. Condensation of water vapors 6. Predict the sign of S for the following reactions CaCO 3 (s) CO 2 (g) + CaO (s) 2 NiS (s) + 3 O 2 (g) 2 NiO (s) + 2 SO 2 (g) O 2 (g) + H 2 O (l) O 2 (aq) H 2 (1atm) H 2 (100atm) 7. Rank the standard molar entropy of the following from lowest to highest: NH 3 (aq), NO(g), Li(s), N 2 O 2 (g), NO 2 (g) a. NH 3 (aq) < NO(g) < Li(s) < N
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ModelQuestion_Ch20 - Model Questions: Chapter 20 1. A...

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