"Sublimation and Condensation" PPT

Description

"Sublimation and Condensation" PPT

Part One Content: Exploration 1

Activity:

Heating iodine crystals in a glass container, what phenomena occurred in the glass container?

What happens to the iodine in the glass container after the heating is stopped?

Thinking: What are the conditions required for sublimation and sublimation?

Sublimation and condensation PPT, part 2 content: phenomena and applications

Do you know what sublimation and sublimation phenomena exist in life?

In the cold winter, ice flowers often form on indoor glass windows?

It is formed when water vapor in the indoor air condenses when it encounters cold glass.

Why do frozen clothes dry out in the shade in winter?

Analysis: Because the ice on the clothes has sublimated!

Sublimation and condensation PPT, the third part: artificial rainfall

When dry ice enters the clouds, it quickly _______ into gas, and absorbs a large amount of heat from the surroundings, causing the temperature of the air to drop sharply. As a result, the water vapor in the high altitude _______ into small ice particles, which gradually become larger and fall. , when encountering warm air currents, they _______ and fall to the ground as raindrops.

white fog on stage

On the stage, dry ice (solid carbon dioxide) is sprayed to create white mist to enhance the atmosphere. Can you explain the reason?

Sublimation and sublimation PPT, part 4: practice

1. In the cold areas of the north, the snow often disappears before melting, exposing the dry ground. This is because the snow ______ at low temperatures. At this time, it requires ( ) a lot of heat, which increases the coldness. Therefore, the snow in the north Often fails to alleviate drought conditions.

2. Which of the following physical state changes belongs to sublimation ( )

A. Open the refrigerator door and see "white gas"

B. The temperature continues to be below 0 degrees Celsius, and the quality of ice sculptures in northern cities is decreasing day by day.

C. The water marks on the ground have dried up

D. On a winter morning, there are ice flowers on the inside of the glass windows of northern houses.

3. Which of the following physical state changes is a sublimation phenomenon ( )

A. The mothballs placed in the closet are getting smaller and smaller

B. The moist soil in the flowerpot dries.

C. In summer, small water droplets appear on the outer wall of the quilt containing cold drinks.

D. In autumn, there is a layer of frost on the roof tiles

Sublimation and sublimation PPT, part 5 content: Practice:

Determine the following physical state change processes

1) In spring, the frozen lake begins to thaw;

2) In summer, when you open the popsicle paper, you will see "white gas";

3) The water sprinkled on the ground dries;

4) In late autumn, there is a layer of frost on the roof tiles;

5) In winter, frozen clothes gradually dry out;

Keywords: Zhejiang Education Edition seventh grade science PPT courseware free download, sublimation and sublimation PPT download, .PPT format;

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"Sublimation and Condensation" PPT courseware:

"Sublimation and Condensation" PPT courseware Part One: Phenomenon Study What kind of change in physical state occurred? Endothermic or exothermic 1. Spring is warm and flowers are blooming and ice and snow melt. 2. Rivers freeze in the cold winter. 3. Wetlands dry up after rain. 4. Water drops fall when you open a lunch box. Phenomenon and thinking 1..

"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: ..

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Update Time: 2024-09-25

This template belongs to science courseware Zhejiang Education Edition Seventh Grade Science Volume 1 industry PPT template

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