"Sublimation and Sublimation" Temperature and Physical State Changes PPT Courseware 2

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"Sublimation and Sublimation" Temperature and Physical State Changes PPT Courseware 2

1. Review:

changes between states of matter

2. Observation and thinking:

The tungsten filament in the bulb will become thinner after being used for a long time, and the inner wall of the bulb will turn black. What questions will students have based on these phenomena?

3. Activity exploration:

Investigate the sublimation and desublimation phenomena of iodine

Equipment: 1. Alcohol lamp 2. Iodine hammer 3. Clamp

4. Think while doing:

1. Before the experiment, what state did you observe of iodine in the iodine hammer? What color is it?

2. During the experiment, when the iodine in the iodine hammer was heated, what phenomena did you see? What is the temperature of the iodine hammer at this time?

3. Stop heating. After a period of time, what phenomena are seen on the inner wall of the iodine hammer? What is the temperature of the iodine hammer at this time?

4. What conclusions can you draw from this experiment?

Notice:

1. During the heating process of this experiment, the hammer is heated evenly!

2. Pay attention to experimental safety and prevent burns!

1. Sublimation:

1. Definition: The direct change of a substance from a solid state to a gaseous state is called sublimation.

2. Conditions: Sublimation and heat absorption

2. Condensation:

1. Definition: The direct change of matter from gaseous state to solid state is called sublimation.

2. Conditions: (When exposed to cold) Condensation releases heat.

Explanation:

1. Why does the filament become thinner?

Solid tungsten is heated and sublimates into tungsten vapor.

2. Why does the inner wall of the light bulb turn black?

When tungsten vapor condenses, it turns into solid tungsten and adheres to the inner wall of the bulb.

7. Apply the knowledge learned to explain some phenomena

1. How is "frost" formed?

Water vapor in the air condenses when it encounters

2. Why do ice flowers appear on window glass in winter?

The water vapor in the room condenses when it encounters cold glass

3. Frozen clothes dry out in the winter.

Ice in clothes sublimates into water vapor

4. The hard popsicles are stained with white "powder"

The water vapor in the refrigerator condenses when it encounters condensation

9. Consolidation exercises:

1. The direct change of matter from ______ to ______ state is called sublimation. Sublimation requires ______ heat; direct change from ______ state to ______ state is called sublimation. Sublimation requires ______ heat.

2. Drying clothes washed in the summer is a ______ phenomenon;

It is a ______ phenomenon that frozen clothes can be dried in the winter.

3. Which of the following phenomena belongs to the sublimation phenomenon ( )

A. Clothes that are frozen outside in winter are dry.

B. There is a layer of frost on the ground

C. There is thick fog in the morning

D. The water sprinkled on the ground has dried up

4. Among the following phenomena, which one belongs to sublimation phenomenon ( )

A. The formation of dew B. The formation of rain.

C. The formation of frost D. The filament of the light bulb becomes smaller

5. When the fluorescent lamp is used for a long time, the wall of the tube turns black because ()

A. The filament sublimates when heated, and the gas in the filament condenses on the tube wall.

B. Glass decomposes to produce black substances

C. The filament is evaporated by heat and then solidified when cooled.

D. The filament heats up, causing the glass near the filament to melt and turn black.

10. Class summary

1. Sublimation: The direct change of a substance from a solid state to a gaseous state is called sublimation, and sublimation absorbs heat.

Sublimation phenomenon: camphor tablets become smaller, frozen clothes dry, and the filament of light bulbs becomes thinner.

2. Sublimation: Substance directly changes from gaseous state to solid state, which is called sublimation. Sublimation releases heat.

Sublimation phenomenon: the formation of frost, ice flowers on window panes, and the formation of rime.

Applications of Dry Ice Sublimation: Artificial Rainfall

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Update Time: 2024-10-20

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