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Cooling Curves

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Cooling Curves Answer Key

Use the cooling curve below to answer the questions that follow.
Cooling Curve
1. 
Which of the following is represented by the cooling curve shown below?
  1. Changes in temperature over time in going from a gas to a liquid to a solid
  2. Changes in temperature over time in going from a solid to a liquid to a gas
  3. Changes in temperature over time involved in phase changes, only
  4. Changes in temperature over time involved in phases, only
2. 
Which of the following exists at t=1 min?
  1. liquid
  2. solid
  3. gas
  4. melting
3. 
Which of the following represents the temperature range involved in the solid phase?
  1. 150ºC-208ºC
  2. 140ºC
  3. 90ºC
  4. 50ºC-90ºC
4. 
Which of the following is represented at time t=5 min?
  1. melting
  2. condensation
  3. evaporation
  4. freezing
5. 
Which of the following phase changes would occur as an endothermic process during time t=2 min to time t=6 min?
  1. condensation
  2. evaporation
  3. freezing
  4. melting
6. 
Which of the following exists at time t=13 minutes?
  1. The liquid phase, only
  2. The solid phase, only
  3. An equilibrium between the solid and the liquid phases
  4. None of the above
7. 
Which of the following represents the temperature range involved in the liquid phase?
  1. 90ºC-150ºC
  2. 140ºC
  3. 90ºC
  4. 50ºC-90ºC
8. 
Which of the following is represented at time t=13 min?
  1. gas
  2. liquid
  3. solid
  4. freezing
9. 
During time t=5 min, kinetic energy remains the same, while potential energy decreases.
10. 
Identify the intervals during which the average kinetic energy is decreasing.
  • Interval 1: Time t=0 min to t=2 min
    Interval 2: Time t=6 min to t=11 min
    Interval 3: Time t=14 min to t=16 min

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