"Sublimation and Sublimation" State of Matter and Its Changes PPT Courseware 5

Description

"Sublimation and Sublimation" State of Matter and Its Changes PPT Courseware 5

teaching objectives

(1) Understand the concepts of sublimation and sublimation, and know that sublimation needs to absorb heat and sublimation needs to release heat.

(2) Understand the sublimation and sublimation phenomena in life and be able to explain them in physical language.

(3) Learn the thinking method of indirectly analyzing and inferring physical processes based on observation results.

Teaching process

1. Design teaching situations

2. Student activities: Artificial “snow”

3. Student activities: Understand and explain the phenomena of sublimation and sublimation in life

Activity 2.7 Artificial “snow”

The experimental operation of "artificial snow scene" can be improved as follows: put a little mothball powder in a flask, then heat it, and then put a dead branch in. At this time, you can see the gaseous mothballs condense into snowflakes on the dead tree. State. Let students make and watch this "artificial snow scene" at room temperature. It is real and credible, which can stimulate interest in learning and arouse curiosity.

A small experiment on sublimation and condensation of iodine

Because iodine can sublime when slightly heated at room temperature, and iodine vapor can desublimate when it is slightly cooled. In addition, iodine vapor (mixed with air) is purple-red, which is easy to observe, so iodine is used for sublimation and desublimation experiments. , is a relatively ideal substance. However, iodine vapor is poisonous, so it is best to seal it up during experiments to avoid affecting the health of students.

Activity: Research applications of refrigerators

question:

1. Is it better to place the refrigeration freezer on top or bottom?

2. Why is there sometimes fog when I open the refrigerator?

3. Where does the water vapor in the icehouse frost layer come from?

4. How to use a refrigerator to save electricity?

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

"Sublimation and Sublimation" Material Forms and Changes PPT Courseware 3:

"Sublimation and Sublimation" Material Forms and 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..

"Sublimation and Sublimation" Material Form and Its Changes PPT Courseware 2:

"Sublimation and Sublimation" Material Forms and Changes PPT Courseware 2 Learning Objectives 1. Know what sublimation and sublimation are, and understand the phenomena of sublimation and sublimation in life 2. Know that sublimation absorbs heat and sublimation releases heat 3. I am willing to explore the phenomena of sublimation and sublimation in life and appreciate...

"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..

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Update Time: 2024-08-01

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume one industry PPT template

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