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- 1. Multiple Choice
Systems in nature tend towards
Low entropy, low energy
Low entropy, high energy
high entropy, low energy
high entropy, high energy
- 2. Multiple Choice
Which of the following reactions shows an increase in entropy?
H2O (g) --> H2O (s)
CO2 (s) --> CO2 (g)
H2O (l) --> H2O (s)
CO2 (g) --> CO2 (s)
- 3. Multiple Choice
What is happening to the potential energy at line BC?
Increasing
Decreasing
Staying the same
- 4. Multiple Choice
What line represents the melting point of this substance?
AB
BC
CD
DE
- 5. Multiple Choice
Which of the following would be exothermic?
Melting of gold
Sublimation of iodine
Freezing of water
Boiling of bromine
- 6. Multiple Choice
What phase is potassium at 500K?
Solid
Liquid
Gas
- 7. Multiple Choice
What is the amount of heat, in joules, required to increase the temperature of a 49.5-gram sample of water from 22°C to 66°C?
2200 J
4600 J
9100 J
14000 J
- 8. Multiple Choice
At which temperature will Hg(l) and Hg(s) reach equilibrium.
234 K
273 K
337 K
630 K
- 9. Multiple Choice
A sample of water is boiling as heat is added at a constant rate. Which statement describes the potential energy and the average kinetic energy of the water molecules in this sample?
The potential energy decreases and the average kinetic energy remains the same
The potential energy decreases and the average kinetic energy increases
The potential energy increases and the average kinetic energy remains the same
The potential energy increases and the average kinetic energy increases.
- 10. Multiple Choice
The heat of fusion of a compound is 126 Joules per gram. What is the total number of Joules of heat that must be absorbed by a 15.0-gram sample to change the compound from solid to liquid at its melting point?
111 J
141 J
1,110 J
1,890 J
- 11. Multiple Choice
What is the total number of kiloJoules required to boil 100. grams of water at 100ºC .
22.6 kJ
33.4 kJ
226 kJ
334 kJ
- 12. Multiple Choice
The temperature of 100. grams of water changes from 16.0ºC to 20.0ºC. What is the total number of Joules of heat energy absorbed by the water?
105
168
420
1680
- 13. Multiple Choice
30°C
55°C
90°C
120°C
- 14. Multiple Choice
A person with a body temperature of 37°C holds an ice cube with a temperature of 0°C in a room where the air temperature is 20°C. The direction of heat flow is
from the person to the ice, only
from the person to the ice and air, and from the air to the ice
from the ice to the person, only
from the ice to the person and air, and from the air to the person
- 15. Multiple Choice
100 °C = _____ K
173 K
373K
273 K
0 K
- 16. Multiple Choice
Convert: 186.5 K to °C
-86.4 °C
-50 °C
-68.4 °C
180 K
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