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Notes: Thermal Energy and Phase Changes. 150 100 50 0. Temperature (°C). 0 1 2 3 4 5 Thermal Energy (Heat). Adding Thermal Energy to H 2 0. 150 100 50 0. Temperature (°C). Ice.

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Presentation Transcript
slide1

Notes: Thermal Energy and Phase Changes

150

100

50

0

Temperature (°C)

0 1 2 3 4 5

Thermal Energy (Heat)

slide2

Adding Thermal Energy to H20

150

100

50

0

Temperature (°C)

Ice

0 1 2 3 4 5

Thermal Energy

slide3

Adding Thermal Energy to H20

150

100

50

0

Temperature (°C)

Melting

Ice

0 1 2 3 4 5

Thermal Energy

slide4

Adding Thermal Energy to H20

150

100

50

0

Temperature (°C)

Water

Melting

Ice

0 1 2 3 4 5

Thermal Energy

slide5

Adding Thermal Energy to H20

150

100

50

0

Vaporization

Temperature (°C)

Water

Melting

Ice

0 1 2 3 4 5

Thermal Energy

slide6

Adding Thermal Energy to H20

150

100

50

0

Vapor

Vaporization

Temperature (°C)

Water

Melting

Ice

0 1 2 3 4 5

Thermal Energy

slide7

Taking Thermal Energy from H20

150

100

50

0

Vapor

Temperature (°C)

0 1 2 3 4 5

Thermal Energy

slide8

Taking Thermal Energy from H20

150

100

50

0

Vapor

Condensation

Temperature (°C)

0 1 2 3 4 5

Thermal Energy

slide9

Taking Thermal Energy from H20

150

100

50

0

Vapor

Condensation

Temperature (°C)

Water

0 1 2 3 4 5

Thermal Energy

slide10

Taking Thermal Energy from H20

150

100

50

0

Vapor

Condensation

Temperature (°C)

Water

Freezing

0 1 2 3 4 5

Thermal Energy

slide11

Taking Thermal Energy from H20

150

100

50

0

Vapor

Condensation

Temperature (°C)

Water

Freezing

Ice

0 1 2 3 4 5

Thermal Energy

slide12

Thermal Energy and Phase Changes

150

100

50

0

Gas

Vaporization

Condensation

Temperature (°C)

Liquid

Melting

Freezing

Solid

0 1 2 3 4 5

Thermal Energy

rules of thumb
Rules of Thumb

1) Horizontal lines are phase changes

2) Diagonal lines are changes in temperature

3) Adding heat causes different phase changes than removing it!

vaporization liquid gas
VAPORIZATION (Liquid-Gas)
  • evaporation – a change in phase from liquid to gas at the surface.
    • this cools the remaining liquid!
  • boiling – a change in phase from liquid to gas below the surface.
    • this cools the remaining liquid!
  • boiling point – the temperature that an object vaporizes or condenses.
condensation gas liquid
Condensation (Gas  Liquid)
  • this is a warming process for the liquid.
  • gas molecules strike surface of liquid and give up so much energy that they can’t stay in gaseous phase
  • examples

droplets forming on mirror

droplets on glass of water

phase change process s l
Phase Change Process (S & L)
  • melting – thermal energy is used to break bonds
    • the bonds that hold molecules in vibrating lattice structure are breaking.
        • the intermolecular forces lessen
  • freezing – thermal energy is used to create bonds and hold molecules in place
    • the bonds that will hold molecules in position are forming
        • the intermolecular forces increase
    • melting point – the temperature at which an object either melts or freezes.