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Topic 9 – Kinetics and Equilibrium
12. Entropy: Recalling concept facts and definitions
1. Entropy measures which of the followings about a chemical system?
1) Activation energy of the system
3) Energy change of the system
2) Intermolecular forces of the system 4) Disorder of the system
2. As a system becomes less random, its entropy
1) Decreases 2) Increases 3) Remains the same
3. As a chemical or physical system becomes more disorder, the entropy of the system
1) Increases 2) Decreases 3) Remains the same
4. As the temperature of a system increases, the entropy of the system
1) Remains the same
3) Increases
2) Decreases
Teacher Preview Copy
Teacher Preview Copy
5. As temperature of a chemical system decreases, the disorder of the system
2) Increases
1) Remains the same
3) Decreases
6. In which of the following forms would a substance has the highest entropy? 4) Aqueous
1) Solid
2) Liquid
3) Gas
7. In which phase would particles of a substance be least random?
1) Solid 2) Liquid 3) Gas 4) Aqueous
8. A system is most likely to undergo a reaction if the system after the reaction has
1) Lower energy and lower entropy 3) Higher energy and higher entropy
2) Lower energy and higher entropy 4) Higher energy and lower entropy
13. Entropy: Determining substance with highest or lowest entropy
1. Which sample of ammonia has the greatest entropy? 3) NH3(s) 4) NH3(aq)
2) NH3(l)
1) NH3(g)
2. Under the same temperature and pressure, which sample of carbon dioxide contains particles with
the lowest entropy?
1) CO2(g) 2) CO2(l) 3) CO2(s) 4) CO2(aq)
3. AT STP, which of the following substances will have the greatest degree of randomness?
1) H2O (s) 2) H2O (l) 3) N2(l) 4) N2(g)
4. A sample of water at which temperature would have molecules with the greatest degree of entropy?
o
o
1) H2O(l) at 25 C 3) H2O(l) at 15 C
o
o
2) H2O(l) at 20 C
4) H2O(l) at 10 C
5. Which sample of a gas at 1 atm has particles with the least degree of disorder?
o
o
1) CH4(g) at 30 C
3) H2S(g) at 40 C
o
o
2) CH4(g) at 20 C 4) H2S(g) at 50 C
6. Which substance will have the lowest entropy?
o
1) O2(g) at 35 C 3) O2(g) at 320 K
o
2) CO(g) at 50 C 4) CO(g) at 280 K
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 279
Topic 9 – Kinetics and Equilibrium
12. Entropy: Recalling concept facts and definitions
1. Entropy measures which of the followings about a chemical system?
1) Activation energy of the system
3) Energy change of the system
2) Intermolecular forces of the system 4) Disorder of the system
2. As a system becomes less random, its entropy
1) Decreases 2) Increases 3) Remains the same
3. As a chemical or physical system becomes more disorder, the entropy of the system
1) Increases 2) Decreases 3) Remains the same
4. As the temperature of a system increases, the entropy of the system
1) Remains the same
3) Increases
2) Decreases
Teacher Preview Copy
Teacher Preview Copy
5. As temperature of a chemical system decreases, the disorder of the system
2) Increases
1) Remains the same
3) Decreases
6. In which of the following forms would a substance has the highest entropy? 4) Aqueous
1) Solid
2) Liquid
3) Gas
7. In which phase would particles of a substance be least random?
1) Solid 2) Liquid 3) Gas 4) Aqueous
8. A system is most likely to undergo a reaction if the system after the reaction has
1) Lower energy and lower entropy 3) Higher energy and higher entropy
2) Lower energy and higher entropy 4) Higher energy and lower entropy
13. Entropy: Determining substance with highest or lowest entropy
1. Which sample of ammonia has the greatest entropy? 3) NH3(s) 4) NH3(aq)
2) NH3(l)
1) NH3(g)
2. Under the same temperature and pressure, which sample of carbon dioxide contains particles with
the lowest entropy?
1) CO2(g) 2) CO2(l) 3) CO2(s) 4) CO2(aq)
3. AT STP, which of the following substances will have the greatest degree of randomness?
1) H2O (s) 2) H2O (l) 3) N2(l) 4) N2(g)
4. A sample of water at which temperature would have molecules with the greatest degree of entropy?
o
o
1) H2O(l) at 25 C 3) H2O(l) at 15 C
o
o
2) H2O(l) at 20 C
4) H2O(l) at 10 C
5. Which sample of a gas at 1 atm has particles with the least degree of disorder?
o
o
1) CH4(g) at 30 C
3) H2S(g) at 40 C
o
o
2) CH4(g) at 20 C 4) H2S(g) at 50 C
6. Which substance will have the lowest entropy?
o
1) O2(g) at 35 C 3) O2(g) at 320 K
o
2) CO(g) at 50 C 4) CO(g) at 280 K
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 279
