"Sublimation and Sublimation" State of Matter and Its Changes PPT Courseware 3

Description

"Sublimation and Sublimation" State of Matter and Its Changes PPT Courseware 3

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.

self-study guide

1. What is sublimation?

2. What is condensation?

3. Which phenomena in life are sublimation phenomena?

4. What phenomena in life are sublimation phenomena?

5. Do sublimation and sublimation need to absorb or release heat respectively?

Quiz

1. The change of substance from solid _____ to gaseous state is called ______.

2. The change of substance from gaseous _____ to solid state is called ______.

3. Like ____ and ____, sublimation requires _____.

4. Like ____ and ____, sublimation requires _____.

5. The following are sublimation phenomena: _______;

The following are sublimation phenomena: _______.

A. Spring is here, the ice and snow melt;

B. The moth balls in the closet disappeared;

C. "Frost" on flowers and plants in the early morning;

D. The water in the pot has boiled dry;

E. "Ice flowers" on the glass window.

Research experiment---sublimation and condensation of iodine

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

1. Before the experiment, I 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?

Experimental research records

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?

Purple iodine vapor fills the flask and no liquid iodine appears.

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

The purple iodine vapor gradually disappeared, and a layer of solid iodine was seen attached to the wall of the flask.

4. What conclusions can you draw from the experiment?

When heated, iodine sublimates from solid to gaseous state directly;

On cooling, iodine condenses from gaseous state directly to solid state.

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

Sublimation needs to absorb heat, and sublimation needs to release heat.

Common physical phenomena in life

a. In the severe cold winter, clothes that have been frozen can be dried.

b. Mothballs placed in the kitchen will become smaller and smaller and eventually disappear.

c. In cold winter, there will be ice flowers on the inner surface of the glass window.

d. The "white powder" on the surface of the popsicles

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

B. The sanitary ball has become smaller.

C. Frost formation

D. Formation of fog and dew

E. Water freezes

F. Summer clothes are dried in the sun

G. Ice turns into water

H. The white breath exhaled from the mouth in winter

I. There is a layer of ice on the inner surface of the glass window in winter

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.

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

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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..

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Update Time: 2024-08-01

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