# Calculate the specific heat for this substance as a gas. (Show your work)

**Thermodynamics Self Study Part 2 – Phase Change Activity**

**The above graph shows the heat absorbed by 2,000 g of an unknown substance.**

__Part 1: Identifying the sections__

__Part 1: Identifying the sections__

**Give the actual temperature value for #1 – 4**

1. What is the freezing point temperature of this substance? [ ]

2. What is the condensation point temperature of this substance? [ ]

3. What is the boiling point temperature of this substance? [ ]

4. What is the melting point temperature of this substance? [ ]

**Use either a range of points (a-d = “phase”) or a single point (b = “point”) for #5 – 11.**

5. In what section does melting occur? [ ]

6. In what section does boiling occur? [ ]

7. In what section does freezing occur? [ ]

8. In what section does condensation occur? [ ]

9. What area of the graph represents the vapor, or gas, phase? [ ]

10. What area of the graph represents the solid phase? [ ]

11. What area of the graph represents the liquid phase? [ ]

12. Refer to the __liquid phase__ only for the following questions.

A. What is the temperature change during this phase? [ ]

B. From the graph find the amount of heat added (in Joules) during this phase. [ ]

C. Calculate the specific heat of the substance as a liquid. [ ]

13. Refer to the __phase change between solid and liquid only__ for the following questions.

A. The section that refers to this phase change is from point [ ] to point [ ].

B. From the graph find the amount of heat added during this phase. [ ]

C. Calculate the heat of fusion of the substance. [ ]

**The above graph shows the heat absorbed by 2,000 g of an unknown substance.**

__Part 2: Calculations__

__Part 2: Calculations__

15. Calculate the specific heat for this substance as a solid. (Show your work)

**[enter response]**

16. Calculate the heat of vaporization for this substance. (Show your work)

**[enter response]**

17. Calculate the specific heat for this substance as a gas. (Show your work)

**[enter response]**

18. How much heat would have to be removed to change the substance from a gas at 180 ºC into a solid at 20 ºC?

**[enter response]**

19. During which part(s) of the graph is the kinetic energy constant? (label as from point x to point y for each section).

**[enter response]**

20. During which part(s) of the graph is the potential energy constant? (label as from point x to point y for each section).

**[enter response]**

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