1. Homework # 6 Heating and Cooling Curve WS AIMS: 4-9
TEST: NEXT THURSDAY (10/20/16)

2. Aim 6: How can we construct a heating/cooling curve?

3. GAS LIQUID SOLID VAPORIZATION CONDENSATION SUBLIMATION DEPOSITION
MELTING
FREEZING
SOLID

4. 1. TEMPERATURE VS KINETIC ENERGY

5. HEATING CURVE: ENDOTHERMIC
GAS KE
E N D O T H E R M I C
BOILING PE
LIQUID KE
MELTING
SOLID PE KE

6. 1. Heating Curve: Endothermic
Solid:
Increase the kinetic energy

7. B. Melting: 0°C Potential energy increases.
 The temperature remains the same, no change in the kinetic energy
Potential energy increases.

8. C. Liquid
Increase the Kinetic energy

9. D. Boiling/Vaporization: 100°C
The temperature remains the same, no change in kinetic Energy.
Potential energy increases.

10. E. Gas
Kinetic energy increases

11. 2. Cooling Curve: Exothermic

12. HEATING CURVE: ENDOTHERMIC
GAS KE PE
CONDENSATION
LIQUID
E X O T H E R M I C KE PE
SOLID
FREEZING KE

13. COOLING CURVE: EXOTHERMIC

16. SUMMARY: Melting: Solid to Liquid Vaporization: Liquid to Gas
Condensation: Gas to Liquid.
Solidification/ crystallization: Liquid to solid.
Deposition: Gas to solid.
Sublimation: Solid to Gas.
Heat of Vaporization: 2260 J/g
Heat of Fusion: 334 J/g

17. Vaporization: Liquid to Gas
Open container

18. Condensation: Gas to Liquid

19. VaporizationL Liquid to Gas

20. Condensation: Gas to Liquid

21. Solidification: Liquid to Solid

22. Sublimation: Iodine, I 2
I2(s)  I2(g)

23. Sublimation:
CO2 (s)  CO2 (g)

24. Why is called CO2 dry ice?
Dry ice is compressed carbon dioxide. Due to its particularly low temperature (around -78.5 °C)
Dry ice is an effective coolant as it is much cooler than ice and leaves no moisture as it changes its state.
It is suitable for storage of food and substances that require very low storage temperature, in particular certain pharmaceutical, medical and chemical products.

25. Deposition:
Laird Hot Springs BC, Canada Distinction between hoarfrost and rime ice is that in formation of hoarfrost, the water vapour condenses through deposition directly to solid ice, while the rime ice is formed following initial condensation into liquid droplets. Thus, hoarfrost is formed when the dew point is warmer than surface but colder than the air temperature, and colder than freezing point. The opposite of sublimation is deposition. The formation of frost is an example of meterological deposition. 

26. Test your knowledge of Chemistry

27. Review 2 1. The flat lines on a heating curve represent
1) a temperature change
2) a constant temperature
3) a change of state 2

28. 2. The sloped lines on a heating curve represent 1) a temperature change 2) a constant temperature 3) a change of state 1

29. 3. Water condenses at a temperature of
1) 0°C 2) 50°C 3) 100°C 3

30. 4. At a temperature of 0°C, water
1) freezes 2) changes to a gas 1

31. 5. When a gas condenses, heat is
1) released 2) absorbed 1

32. 6. Freezing is
1) endothermic 2) exothermic 2

33. Use the heating and Cooling Curve diagram:
Is energy absorbed (1) or released (2) in each of the following:
____7. Ice to liquid water
____8. Water vapor to rain
____9. Water to ice
Absorbed
Released
Released

34. End of the show

35. C

36. B

37. C

38. C

39. B

40. D

41. A

42. D

43. D