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"Sublimation and Condensation" PPT courseware
Part One Content: Phenomenon Research
What kind of physical state change occurred? Endothermic or exothermic?
1. Spring is warm, flowers are blooming, ice and snow are melting
2. The river freezes in the twelfth lunar month of winter.
3. After the rain, the weather clears and the wetland becomes dry.
4. Open the lunch box and water drops fall down
Phenomenon and thinking
1. During the experiment, the iodine in the glass container was heated. What phenomena were seen in the glass container?
Iodine crystals turn directly into iodine vapor when heated
2. Stop heating. What phenomenon do you see on the inner wall of the other end of the glass container?
Iodine vapor turns directly into iodine crystals when cooled
Sublimation and condensation PPT, part 2 content: Science in life
Where did the mothballs (sanitary balls) sitting in the closet go?
How does needle-like rime form in midwinter?
How is the "white powder" on the surface of popsicles formed?
Why do light bulbs turn black after being used for a long time?
When the temperature is below 0℃, can frozen clothes be dried in a place without sunlight?
Sublimation and sublimation PPT, part 3 content: Class discussion:
Can you use a refrigerator to create fog, dew and frost? Please describe the method.
For example: after taking a beverage bottle out of the refrigerator, small water droplets appear on the outer wall of the bottle, causing condensation; when taking out a popsicle from the refrigerator, there is white powder on the wrapping paper, causing frost; when the refrigerator door is opened, a popsicle appears. fog.
Sublimation and sublimation PPT, part 4 content: Classroom exercises:
1. If we can smell the smell of a certain solid substance, what kind of physical state change has occurred in this solid substance?
It means that molecules run out of the solid material and directly enter the air, that is, the solid material sublimates.
2. As shown in the picture on the right, it is a "dry ice beard". Can you explain the phenomenon of dry ice growing "beards" in the air?
The temperature of dry ice is very low, causing water vapor in the surrounding air to condense on the surface of the dry ice.
3. As shown in Figure 4-83, in very cold areas in the north, frost will grow on masks, hats, and eyebrows when people are outdoors. Talk about how these frosts are formed.
When a person is outdoors, the temperature of the mask, hat, and eyebrows is very low. When gas is exhaled from the mouth, the water vapor in it will condense on the cold mask, hat, and eyebrows and turn into small ice crystals.
Sublimation and sublimation PPT, Part 5 content: Supplementary exercises:
1. The tungsten filament in the light bulb will become very thin after being used for a long time. This is ()
A. Sublimation phenomenon of tungsten wire B. Sublimation phenomenon of tungsten wire
C. Vaporization phenomenon of tungsten wire D. Melting phenomenon of tungsten wire
2. Which of the following phenomena belongs to sublimation ( )
A. The mothballs become smaller B. The formation of dew
C. Wet clothes dry D. Frost on the ground
3. On a cold winter morning, you can find glass windows
There is a layer of ice on the glass, this is due to ( )
A. The water vapor in the cold outdoor air first liquefies into small water droplets, and then solidifies into ice flowers, which adhere to the outer wall of the glass.
B. The water vapor in the room releases heat towards the glass and liquefies into small water droplets, and then solidifies into ice flowers, which adhere to the inner wall of the glass.
C. The water vapor in the room releases heat towards the glass and condenses into ice flowers, which adhere to the inner wall of the glass.
D. The outdoor water vapor releases heat towards the glass and condenses into ice flowers, which adhere to the outer wall of the glass.
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"Sublimation and Condensation" PPT:
"Sublimation and Sublimation" PPT Part One Content: Exploration 1 Activity: Heat the iodine crystals in the glass container and observe what phenomena appear in the glass container? After stopping the heating, what happens to the iodine in the glass container? Thinking: Sublimation What conditions are needed for He Ninghua...
"Sublimation and Sublimation" Temperature and Physical State Changes PPT Courseware 3:
"Sublimation and Sublimation" Temperature and Physical State Changes PPT Courseware 3 Review Review 1. What are the conversion processes between solid and liquid called? Endothermic or exothermic? The change of matter from solid to liquid is called melting, which is an endothermic process. ; The change of substance from liquid to solid is called solidification, which is...
"Sublimation and Sublimation" Temperature and Physical State Changes PPT Courseware 2:
"Sublimation and Sublimation" Temperature and Physical State Changes PPT Courseware 2 1. Review: Changes between physical states 2. Observation and thinking: The tungsten filament in a long-used light bulb will become thinner, and the inner wall of the light bulb will turn black. What questions will students have based on these phenomena? 3. Activity exploration: ..