"Sublimation and Sublimation" PPT Courseware on Changes in State of Matter 7

Description

"Sublimation and Sublimation" PPT Courseware on Changes in State of Matter 7

1. Review the past and learn the new

Gaseous state Liquefaction (exothermic) Liquid state

Liquid Vaporization (endothermic) Gaseous

Solid state Melted (endothermic) Liquid state

Liquid Solidification (exothermic) Solid

2. Exploration activities: Making artificial “snow”

What physical state changes occur to iodine when heated?

When iodine changes into a physical state, does it ever appear in a liquid state?

Is this change of state of iodine endothermic or exothermic?

What changes in the physical state of iodine occur when it cools?

When iodine changes into a physical state, does it ever appear in a liquid state?

Is this change of state of iodine endothermic or exothermic?

concept

Sublimation: the phenomenon of matter changing directly from solid to gaseous state

Sublimation needs to absorb heat

Sublimation: the phenomenon of matter changing from gaseous state directly to solid state

Condensation releases heat

Introduction to dry ice

Dry ice is solid carbon dioxide that exists at minus 78.5 degrees Celsius under atmospheric pressure.

Liquid carbon dioxide forms a solid state when cooled to -21.1°C and the pressure is 0.415Mpa.

Dry ice absorbs heat and can directly sublimate into gas.

Dry ice density 1500Kg/m3

The mystery of stage "smoke"

The dry ice sprayed on the stage instantly sublimates, absorbing heat from the surroundings, causing the temperature to drop; the water vapor in the surrounding air liquefies into small water droplets when cooled, which is the smoke we see.

4. Apply what you learn

Throwing dry ice into the cold clouds…

Dry ice sublimates and absorbs heat, causing the air temperature to drop sharply; water vapor in the air condenses into small ice crystals...

Small ice particles grow larger and fall...

When small ice crystals encounter warm currents, they melt into raindrops and fall...

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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.

"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..

File Info

Update Time: 2024-09-11

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

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