

Phase changes and Latent Heat
Presentation
•
Physics
•
11th Grade
•
Easy
+1
Standards-aligned
Seth Harris
Used 2+ times
FREE Resource
6 Slides • 6 Questions
1
Phase changes and Latent Heat
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2
Equilibrium
two opposing changes happen at an equal rate
Pressure helps to characterize gas. P= F/A. unit=N/m2
1 atm, 101.325 kPa,101325 Pa,760 torr, 760 mm Hg- all pressure units
Equilibirum vapor pressure- pressure of a gas in equilibrium with a liquid
Boiling Point- vapor pressure= atmospheric pressure
3
4
Open Ended
Discussion: Does water boil at 100 degrees C at the top of a mountain? Why?
5
Open Ended
Why does evaporation keep you cool?
6
Latent heat
thermal energy required to change 1 kilogram of a substance from one phase to another, Lf
Latent heat of fusion- heat needed to freeze a liquid
Latent heat of vaporization- heat needed to boil, Lv
Latent heat of sublimation- heat needed to boil a solid into a gas, Ls
heat needed to change phase= mass x latent heat or Q= mL
7
Open Ended
Does temperature change while something is inequilibrium between two states?
8
9
Open Ended
Does boiling water or steam produce a more severe burn?
10
Fill in the Blanks
How much thermal energy must be removed from .72 kg of water at 0 degrees C to make ice cubes at 0 degrees C? Latent heat of fusion for water is 33.5 x104 J/kg
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11
Calculate the thermal energy required to change .55 kg of ice at -20 C to liquid water at 20 C
specific heat of ice is= 2090 J( kgx C)
latent heat of fusion for water= 33.5 x 104 J/kg
specific ehat of water= 4186 J(kgxC)
12
Open Ended
Why is placing an ice cream mixture in a bag in a bowl filled with ice and salt effective at freezing the mixture
Phase changes and Latent Heat
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