"Sublimation and Sublimation" PPT Courseware on Changes in State of Matter 2

Description

"Sublimation and Sublimation" PPT Courseware on Changes in State of Matter 2

teaching objectives

1. Understand the concepts of sublimation and sublimation.

2. Know that sublimation needs to absorb heat and sublimation needs to release heat.

3. Understand the phenomena of sublimation and sublimation in life.

1. Sublimation and sublimation

Sublimation: The process by which a substance changes directly from a solid state to a gaseous state. Absorbs heat during sublimation

Sublimation: The process in which a substance changes from gaseous state directly to solid state. Releases heat during condensation

2. Sublimation, condensation and application in life

If the sanitary balls are placed in a box, they will become smaller or disappear after a few months. What is the phenomenon?

A light bulb that has been used for a long time will turn black. What happens to the tungsten filament?

rime

1. How is "Rime" formed?

Rime is tiny ice crystals or ice particles formed by the condensation of water vapor.

Water vapor in the air condenses directly into small ice crystals when encountering cold glass.

Frost is formed when water vapor condenses when it encounters condensation. If the temperature is high, no frost will form. Therefore, "cold before frost" is inevitable.

The "cold after snow" is because snow needs to absorb a lot of heat from the air when it melts, causing the temperature to drop and making people feel cold.

Classroom training

1. Sublimation is a phenomenon in which matter changes directly from _______ to ________. During the sublimation process, ______ heat is required.

2. Sublimation is a phenomenon in which matter changes directly from ______ to ____. The process of sublimation requires ____ heat.

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

A. In winter, clothes that are frozen outside become dry.

B. In summer, the water sprinkled on the ground indoors dries.

C. In the morning of early spring, frost appears on the tiles

D. On late autumn nights, fog appears in the air

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

A. The "white air" exhaled by people outdoors in winter

B. The amount of water placed in a glass with an open mouth will decrease over time.

C. The mothballs placed in the closet slowly become smaller and even disappear.

D. Window grilles appear on window glass in cold winter

5. After the fluorescent tube is used for a long time, both ends will turn black. This is caused by the tungsten filament ( )

A. The result of sublimation B. The result of sublimation first and then sublimation

C. The result of sublimation D. The result of first sublimation and then sublimation

Summary of this lesson

1. Sublimation: The process in which a substance changes directly from a solid state to a gaseous state is called sublimation. Sublimation absorbs heat.

Sublimation phenomenon: camphor tablets become smaller, frozen clothes dry, and light bulb filaments become thinner

2. Sublimation: The process of matter changing directly from gaseous state to solid state is called sublimation. Sublimation releases heat.

Condensation phenomena: formation of frost, formation of ice flowers on window panes, formation of rime, darkening of light bulbs

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For more information about the PPT courseware "Sublimation and Sublimation Changes in the State of Matter", please click the Sublimation and Sublimation ppt Changes in the State of Matter ppt tag.

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"Sublimation and Sublimation" Material Forms and Changes PPT Courseware:

"Sublimation and Sublimation" Material Forms and Changes PPT Courseware Teaching Objectives 1. Know what sublimation and sublimation are, and understand the phenomena of sublimation and sublimation in life. 2. Know that sublimation needs to absorb heat and sublimation needs to release heat. 3. Understand and sublimate through experiments, observation and analysis..

File Info

Update Time: 2024-10-09

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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