България. bulgaria physics lesson 9 class
TRANSCRIPT
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БългарияБългария
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Bulgaria
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PhysicsPhysics lesson lesson
9 9 classclass
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EVAPORATION AND BOILINGEVAPORATION AND BOILING
Compare the processes on these Compare the processes on these points:points:
Start and final state of the mattersStart and final state of the matters Conditions necessaryConditions necessary for the processfor the process Temperature changesTemperature changes Internal energyInternal energy
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SPIRITS EVAPORATIONSPIRITS EVAPORATION
Watch the changing of Watch the changing of the temperature during the temperature during spirits evaporation spirits evaporation
Make an inferenceMake an inference
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BOILING OF WATERBOILING OF WATER
How does the How does the temperature change temperature change during the heating of during the heating of the water?the water?
Watch the changes in Watch the changes in the liquid the liquid
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1. 1. EVAPORATIONEVAPORATION EVAPORATION-the process of molecule EVAPORATION-the process of molecule
separation from the free liquid surfaceseparation from the free liquid surface Liquid is changing into vapourLiquid is changing into vapour During evaporation the fastest molecules leave the During evaporation the fastest molecules leave the
free surface and the molecules ,that remain in the free surface and the molecules ,that remain in the liquid ,have smaller kinetic energy. This is way the liquid ,have smaller kinetic energy. This is way the liquid cools down.liquid cools down.
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2. BOILING2. BOILING
Boiling-the process vaporization from the whole volume of Boiling-the process vaporization from the whole volume of the liquidthe liquid
At constant pressure, while the liquid is boiling, despite the At constant pressure, while the liquid is boiling, despite the heat supply, the temperature remains constant /heat supply, the temperature remains constant /boiling boiling pointpoint//
The boiling point is a quantity characteristic of the deferent The boiling point is a quantity characteristic of the deferent liquidsliquids
The boiling point of a liquid depends on external pressure-The boiling point of a liquid depends on external pressure-when the pressure is higher, the boiling point riseswhen the pressure is higher, the boiling point rises
Latent heat of vaporization/Latent heat of vaporization/rr/-the quantity of heat, needed /-the quantity of heat, needed for a unit mass of a given liquid to be turned into vapor at for a unit mass of a given liquid to be turned into vapor at constant temperatureconstant temperature
r=Q/m r=Q/m
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3. CONDENSATION 3. CONDENSATION
Condensation-process Condensation-process of changing vapour of changing vapour into liquidinto liquid
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ON-LINE PHYSICS LAB ON-LINE PHYSICS LAB INDIVIDUAL ACTIVITIES INDIVIDUAL ACTIVITIES INDIVIDUAL ACTIVITIES INDIVIDUAL ACTIVITIES
IN INTERACTIVE EXPERIMENTSIN INTERACTIVE EXPERIMENTS
Fit together the Fit together the necessary equipment necessary equipment and examine the and examine the process under process under following conditions:following conditions:– Constant temperatureConstant temperature– Heating Heating – Cooling Cooling
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4. PUTTING EVAPORATION AND 4. PUTTING EVAPORATION AND BOILING INTO PRACTICE BOILING INTO PRACTICE
Distillation Distillation Separating compositesSeparating composites Autoclaves Autoclaves Vacuum apparatuses Vacuum apparatuses
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EXAMINE YOURSELF EXAMINE YOURSELF
1. 1. You have to watch evaporation at: You have to watch evaporation at:
А) Low temperature
B) High temperature
C) Any temperature
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Mistake!Mistake!
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CorrectCorrect!!
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Examine yourselfExamine yourself
2.2.What is the correlation between waters What is the correlation between waters boiling point in open container at see boiling point in open container at see level /Tlevel /T11/ and on the mountain top/T/ and on the mountain top/T22/? /?
А) Т1 = Т2
B) Т1 > Т2
C) Т1 < Т2
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Examine yourselfExamine yourself
3. 3. What amount of heat is required for the What amount of heat is required for the complete evaporation of 200 g water at complete evaporation of 200 g water at temp.100 temp.100 °°CC? ( r = 2260 kJ/kg)? ( r = 2260 kJ/kg)
А) 4,52.105 J
B)2,26.105 J
C) 4,52.107 J
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THANK YOU FOR YOUR THANK YOU FOR YOUR ATTENTION!ATTENTION!