B. The following is a cooling curve showing the release of heat at a constant rate of 500.0 joules/minute from a 3.00 gram sample of water vapor at 140.0°C. The final temperature of the ice is -20.0°C
2
TO
T
E
M
P
E
R
A
т
3
R
E
ec
4
0
5
10 11
12
13
14
15
16
17
18
19
20
21
22
23 24
TIME (Minutes) Heat removed at a constant rate
7
Questions
1. During which segments is kinetic energy decreasing? L: 3,5
2. During which segments does kinetic energy remain the same? 2.4
3. During which segments is potential energy decreasing? 2,4
4. During which segments does potential energy remain the same? 13,5
5. During which segments is one phase only present? 3
6. During which segments are two phases present? 24
At what time does the liquid phase first appear? 3 minutes
8. At what time does the solid phase first appear? 19 minutes
9. At what time do the particles have the highest average kinetic energy? minute
10. Phase changes that occur with a release of energy are Exothermia
11.
and
are exothermic phase changes.
12. How long does it take to completely freeze the sample at its freezing point?
13. How long does it take to completely condense the sample at its condensation point?
14. During which segment is the substance entirely in the solid state?
15. During which segment is the substance entirely in the liquid state?
16. During which segment is the substance entirely in the gas state?
17. How long is the solid state in equilibrium with the liquid state?
The temperature of the sample at this point is
Kelvin
18. How long is the liquid state in equilibrium with the gas state?
The temperature of the sample at this point is
Kelvin