"Sublimation and Sublimation" PPT download of changes in the state of matter

"Sublimation and Sublimation" PPT download of changes in the state of matter

The first part: sorting out new knowledge

1 Sublimation and sublimation

1. Sublimation: The process of matter changing directly from ______ state to ______ state is called sublimation. Sublimation ______ heat.

2. Sublimation: The process of matter changing directly from ______ state to ______ state is called sublimation. Ninghua ______ hot.

[Explanation]Dry ice (solid carbon dioxide), iodine, ice, naphthalene, and metallic tungsten are easy to sublime, while gaseous iodine, gaseous naphthalene, and gaseous tungsten are easy to sublime.

2. Water cycle in nature

1. The transformation between the three states of water and the absorption and release of heat

2. The differences and connections between the six physical state changes

Sublimation and condensation PPT, part 2: application examples

Type 1 Sublimation phenomenon and its characteristics

Example 1: Figure 3-4-2 shows the "Locomotive" ice sculpture in the ice sculpture exhibition. The temperature in the exhibition area has been below -10 ℃, but the ice sculptures have become smaller day by day. The changes in physical state during this process are ()

A． Sublimation B. melt

C. Vaporization D. Sublime

[ Analysis for the sake of.

[Error-prone warning]Sublimation is the direct change of a substance from a solid state to a gaseous state without going through a liquid process in the middle. Sublimation absorbs heat and refrigeration. The phenomenon of sublimation is involved in the shrinking of mothballs and artificial rainfall.

Type 2: Sublimation phenomenon and its characteristics

Example 2: Figure 3-4-3 shows the rime scene in a certain place in my country. Rime is formed when water vapor is cooled ()

A． LiquefactionB. Sublime

C. Vaporization D. sublimation

[Error-prone warning] ①Rime and fog are different. Fog is small droplets formed by the liquefaction of water vapor in the air when it is cooled, while rime is formed by the condensation of water vapor in the air. ② The "ice flowers" and "water mist" on the window glass are formed by the condensation and liquefaction of water vapor with "higher" temperature respectively, so they appear on the side with higher temperature. For example, "ice flowers" appear on the glass in winter. the inside of.

Type 3 Water cycle in nature

Example 3 Please read the following passage and answer the questions.

Little water droplets roaming the world

With water, everything can survive. Under certain conditions, water changes its shape, creating various unique natural landscapes. The ethereal clouds, fog, crystal dew, heavy frost, soft snow, rain, and hail in nature are all "masterpieces" of small water droplets.

Liquid water in rivers, rivers, lakes, seas and the surface of the earth continues to evaporate into water vapor under the sunlight. The air containing water vapor rises to high altitude, liquefies into small water droplets or ①__________ into small ice crystals when cooled, and is lifted up by the rising hot air to form clouds. Clouds move with the wind, and under certain conditions, the small water droplets in the clouds continue to change into water vapor and then into small ice crystals. When an ice crystal becomes too large to be lifted up by rising air currents, it has to fall. As the ice crystals fall, they either ②________ into small water droplets that fall to the ground as rain, or as snow that falls to the ground.

"Artificial rainfall" is based on the physical characteristics of different clouds, choosing the right time to use aircraft to sow dry ice into the clouds to cause precipitation or increase precipitation, so as to relieve or alleviate farmland drought, increase reservoir irrigation or water supply capacity, or increase the amount of water for power generation. wait. my country's earliest artificial rainfall experiment was in 1958. Jilin Province suffered a severe drought that had not been experienced in 60 years in the summer, and artificial rainfall was successful.

(1) Please fill in the appropriate names of physical state changes in the horizontal lines in the passage: ①____________; ②____________.

Sublimation and sublimation PPT, part three: classroom feedback

1. Figure 12-1 shows four phenomena that occur in cold winter, among which the ones that belong to sublimation are ()

2. Among the natural phenomena shown in Figure 12-2, what is formed by sublimation is ()

3． As shown in Figure 12-3, fill in the name of the physical state change and the absorption and release of heat in the brackets.

4. Figure 12-4 is a schematic diagram of the water cycle. In the figure, the physical state changes occurring in process ① are vaporization, accompanied by ______ heat; the physical state changes occurring in process ② are sublimation and _______, accompanied by heat release.

Keywords: Free download of PPT courseware for eighth-grade physics volume 1 of the People's Education Press, download of sublimation and sublimation PPT, download of PPT on changes in the state of matter, .PPT format;

For more information about the PPT courseware "Sublimation and Sublimation of Changes in the State of Matter", please click on the Sublimation and Sublimation ppt tab of "Changes of the State of Matter" ppt.

"Sublimation and Sublimation" PPT teaching courseware on changes in physical states:

"Sublimation and Sublimation" PPT teaching courseware on changes in the state of matter Part 1: Knowledge points Basic knowledge point 1 Sublimation 1. Xiaojie designed a fire-extinguishing bomb with dry ice inside. When the fire-extinguishing bomb was thrown into the fire scene, the shell ruptured and the dry ice quickly Sublimation (fill in the name of the state of matter) into...

"Sublimation and Sublimation" Changes in Physical State PPT:

"Sublimation and Sublimation" PPT on Changes in State of Matter Part One: Preview of Perception 1. Sublimation 1. Concept. The process by which matter is produced by _______________. 2. Features. ________ calories. 3. Application. Sublimation is commonly used in production to obtain ________ to refrigerate food..

"Vaporization and Liquefaction" PPT courseware on changes in states of matter (Lesson 2: Liquefaction):

"Vaporization and Liquefaction" PPT courseware on changes in the state of matter (Lesson 2: Liquefaction) Part One: Knowledge Points Basic Knowledge Points Liquefaction 1. In winter, students who wear glasses always have a problem when eating noodles, that is, looking at them while eating. We no longer see each other. This is because of the water vapor in the noodles.