"Sublimation and Sublimation" PPT Courseware on Changes in State of Matter 5

Description

"Sublimation and Sublimation" PPT Courseware on Changes in State of Matter 5

learning target

1. Know the phenomena of sublimation and sublimation.

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

3. Can simply explain the common phenomenon of sublimation and heat absorption.

Research experiment: sublimation and condensation of iodine

Experimental equipment: flask, rubber stopper, alcohol lamp, iron stand

1. Before the experiment, guess: heating iodine will cause ＿＿＿＿＿＿＿＿

2. During the experiment, when the iodine in the flask was heated, what phenomena were seen in the cup? Is there any liquid iodine present?

3. Stop heating. What phenomena are seen on the wall of the flask?

4. What conclusions can you draw from the experiment?

5. Why do you need to use an alcohol lamp for heating? Is it okay without heating?

sublimation

The phenomenon of matter changing directly from solid to gaseous state

Sublimation requires heat absorption

Sublime

The phenomenon of matter changing directly from gaseous state to solid state

Sublimation requires heat release

rime

It appears in the severe cold winter and is formed by the condensation of water vapor in the air on the surface of cold objects (easy to shake off).

Standard training

1. Talk about the changes in the state of matter in each of the following phenomena and explain the absorption and release of heat.

A. Iodine turns into purple gas (sublimation absorbs heat)

B. The sanitary ball has become smaller (sublimation and heat absorption)

C. Frost formation (sublimation heat release)

D. Formation of fog and dew (heat generated by liquefaction)

E. Water freezes (freezing heat)

F. Clothes are dried in the sun in summer (vaporization and heat absorption)

G. Ice turns into water (melting absorbs heat)

H. White breath exhaled from the mouth in winter (liquefaction and heat release)

I. In winter, a layer of ice forms on the inner surface of the glass window (condensation releases heat)

2. Thinking questions: As the saying goes, "It's cold before frost, and it's cold after snow." Use the relevant knowledge you have learned to explain it.

Because frost is small ice particles formed by the condensation of water vapor in the air. The condensation process requires heat release. The condition for water vapor to release heat into the air is that the temperature is lower than the water vapor temperature. Therefore, it can only be achieved when the temperature is low enough. , water vapor will condense into frost, because the temperature is low when frost occurs, and people often feel cold. The temperature in snowy weather is already low. After it snows, the snow absorbs heat from the surrounding air when it melts, causing the originally low temperature to further drop, so it is cold after snow.

think

Clouds, rain, snow, dew, fog, and frost are very common natural phenomena. Do you know how they are formed?

The formation process of precipitation

water vapor rises

At high altitudes, water vapor condenses into small water droplets

Small water droplets gather to form clouds

When the small water droplets become larger, it rains

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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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File Info

Update Time: 2024-11-24

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

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