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Phase change and latent heat C ontents: Phases of matter Changing phase Latent heat Graphs of phase change Whiteboard Graph whiteboards.

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Presentation on theme: "Phase change and latent heat C ontents: Phases of matter Changing phase Latent heat Graphs of phase change Whiteboard Graph whiteboards."— Presentation transcript:

1 Phase change and latent heat C ontents: Phases of matter Changing phase Latent heat Graphs of phase change Whiteboard Graph whiteboards

2 4 Phases of Matter TOC Solid Crystalline/non crystalline Liquid Greased marbles Gas Ping pong balls Plasma Electrons no longer bound to particular nucleus

3 Phase changes and latent heat TOC KEPEKEPEKE

4 Melting or boiling a substance TOC Q = mL Q - Heat (in J) m - Mass (in kg) L - Latent heat (in J kg -1 ) of fusion = melting vaporization = boiling Q -> Potential Energy (Temperature does not rise)

5 Melting or boiling a substance TOC Q = mL Some latent heats (in J kg -1 )FusionVaporisation H 2 O 3.33 x 10 5 22.6 x 10 5 Lead 0.25 x 10 5 8.7 x 10 5 NH 3 0.33 x 10 5 1.37 x 10 5 Notice that these are all huge Notice that vaporisation is more

6 Latent Heat 11 | 2 | 3 | 423 TOC

7 Q = mL Q = ??, m = 4.51 kg, L =.25 x 10 5 J kg -1 112,750 J = 1.1 x 10 5 J 1.1 x 10 5 J W Dewey Cheatham melts 4.51 kg of lead. What heat is needed? Some latent heats (in J kg -1 )FusionVaporisation H 2 O 3.33 x 10 5 22.6 x 10 5 Lead 0.25 x 10 5 8.7 x 10 5 NH 3 0.33 x 10 5 1.37 x 10 5

8 Q = mL Q = 45 x 10 6 J, m = ??, L = 22.6 x 10 5 J kg -1 19.91 kg 20. kg W Helen Highwater pumps 45 MJ (45 x 10 6 J) of heat into some water at 100 o C. How much boils away? Some latent heats (in J kg -1 )FusionVaporisation H 2 O 3.33 x 10 5 22.6 x 10 5 Lead 0.25 x 10 5 8.7 x 10 5 NH 3 0.33 x 10 5 1.37 x 10 5

9 Q = mL, power = work/time (= heat/time) Q = ??, m = 12.0 kg, L = 3.33 x 10 5 J o kg -1 3,996,000 J, power = heat/time heat = 3,996,000 J, power = 1500. J/s 2660 seconds W Aaron Alysis has a 1500. Watt heater. What time will it take him to melt 12.0 kg of ice, assuming all of the heat goes into the water at 0 o C Some latent heats (in J kg -1 )FusionVaporisation H 2 O 3.33 x 10 5 22.6 x 10 5 Lead 0.25 x 10 5 8.7 x 10 5 NH 3 0.33 x 10 5 1.37 x 10 5

10 Q = mc ice  T + mL + mc water  T 711022.4 J 7.11 x 10 5 J W Eileen Dover takes 1.42 kg of ice ( c = 2100 J o C - 1 kg -1 ) from -40.0 o C to water ( c = 4186 J o C -1 kg -1 ) at 20.0 o C. What TOTAL heat is needed? Some latent heats (in J kg -1 )FusionVaporisation H 2 O 3.33 x 10 5 22.6 x 10 5

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