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Authoritative PPT Summary
"Vaporization and Liquefaction" Temperature and Physical State Changes PPT Courseware
learning target:
1. Master the definition of vaporization and know the two ways of vaporization
2. Understand the phenomenon of evaporation, know that evaporation needs to absorb heat and have a cooling effect, and be able to grasp the influencing factors of evaporation.
3. Understand the phenomenon of liquid boiling, record data, and draw images
4. Be able to distinguish the similarities and differences between evaporation and boiling
Vaporization: The change of a substance from a liquid state to a gaseous state is called vaporization.
There are two ways of vaporizing: evaporation and boiling.
1. Evaporation
1. (1) Evaporation: The vaporization phenomenon that occurs only on the surface of a liquid is called evaporation.
It is a slow vaporization phenomenon.
(2) Evaporation can occur at any temperature
(3) Liquid needs to absorb heat when evaporating (having a refrigeration effect).
2. Factors affecting evaporation speed
(1) The temperature of the liquid
(2) Size of liquid surface area
(3) Flow rate of air above the liquid surface
(4) Liquid type
2. Boiling
Activity 2.4 Observe the boiling of water
Compare before boiling and when boiling
1. Look at:
(1) How many bubbles are there in the water?
(2) Changes in size of bubbles as they rise
2. Listen: changes in sound volume
3. Note: Record the reading of the thermometer every 0.5 minutes after reaching 90°C until the water boils and stops reading after 2 minutes.
Possible reasons why water takes too long to go from heating to boiling:
1. The initial temperature of the water is too low
2. More water
3. No lid
4. The firepower is too small
(or not heated with external flame)
3. Practice in class
1. The phenomenon of matter changing from _____ to _____ is called vaporization. This process requires _____ heat. There are two ways of vaporization: _____ and _____.
2. The following measures can slow down evaporation: ( )
A. Sweep away the water on the classroom floor and it will dry easily.
B. In summer, people use electric fans to fan themselves
C. Spread the wet clothes to dry in a ventilated and sunny place
D. Wrap vegetables in plastic bags and put them in the refrigerator
3. Xiao Li boiled the same dumplings in water and fried them in oil. After a period of time, he took out the dumplings and found that the fried dumplings turned yellow and charred, while the boiled dumplings did not turn yellow and charred. This means ( )
A. Water is colorless and oil is yellow.
B. The heat transfer performance of oil is stronger than that of water
C. The boiling point of oil is higher than the boiling point of water.
D. Oil has no boiling point, but water has a boiling point.
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