"Vaporization and Liquefaction" Changes in State of Matter PPT (Evaporation and Boiling in Lesson 1)

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"Vaporization and Liquefaction" Changes in State of Matter PPT (Evaporation and Boiling in Lesson 1)

Part One: Preview Perception

1. Vaporization

The process by which matter changes from ________ to ________.

2. Boiling

1. Concept: ________ vaporization phenomenon of liquid ________ and ________ occurring at the same time.

2. Phenomenon: A large number of bubbles formed continue to ________, bursting when the water surface reaches the surface, and the ________ inside is dispersed into the air.

3. Characteristics: Continuously absorbing heat, temperature ________.

4. Boiling point: Various liquids have a certain ________ when they boil.

3. Evaporation

1. Concept: Vaporization phenomenon that can occur at ________ temperature.

2. Occurrence site: only in liquid ________.

3. Influencing factors: ___________ of the liquid, ___________ of the liquid, and the flow of air near the liquid surface___________.

4. Characteristics: The liquid ________ heat during evaporation, causing the temperature of the liquid and objects in contact with the liquid to ________.

Vaporization and liquefaction PPT, part 2: interactive classroom understanding

Comparison of evaporation and boiling

[Example] Which of the following statements about evaporation and boiling is correct ()

A. Both evaporation and boiling require the absorption of heat from the outside world

B. Both evaporation and boiling can occur at any temperature

C. Evaporation releases heat and boiling absorbs heat.

D. The speed of evaporation has nothing to do with temperature. The temperature remains unchanged during boiling.

Tip: This question examines the similarities and differences between the two methods of vaporization. The key to solving the problem is to understand the concepts of evaporation and boiling. Evaporation is a vaporization phenomenon that can occur at any temperature and only occurs on the surface of a liquid. Boiling is a violent vaporization phenomenon that occurs simultaneously inside and on the surface of a liquid at a certain temperature. Both are vaporized and both absorb heat.

Analysis: Evaporation and boiling are both vaporization phenomena and both absorb heat. A is right and C is wrong. Evaporation is a vaporization phenomenon that occurs on the surface of a liquid at any temperature. Boiling occurs at a certain temperature on the surface and inside of a liquid at the same time. The vaporization phenomenon, B is wrong; the factors that affect the speed of evaporation are: the temperature, the size of the liquid surface area, and the air flow speed on the liquid surface, D is wrong.

Answer:A

Vaporization and liquefaction PPT, Part 3: Try the application

1. Boiling

1. The experiment to observe the boiling of water is as shown in the figure. During the heating process, which of the following statements is not true ()

A. Before water approaches boiling, no bubbles are produced in the water.

B. The faster the water temperature rises, the more “white gas” is produced

C. During the boiling process of water, the bubbles in the water continue to rise and grow until the water surface bursts.

D. During the process of water boiling, the water temperature does not change

2. The boiling of water is a violent ________ (fill in the name of the change in the state of matter) phenomenon. During the boiling process, water continues to absorb heat, but the temperature ________ (please fill in "increase", "decrease" or " constant").

2. Evaporation

3. The following measures can slow down evaporation: ()

A. Blow dry wet hair with an electric hair dryer

B. Use a broom to sweep away the accumulated water on the ground

C. Wrap the vegetables in plastic wrap and put them in the refrigerator

D. Drink boiling water and blow on the water surface to avoid scalding your mouth.

4. In summer, people feel cool when blowing air from an electric fan. This is because ()

A. The electric fan blows cold air

B. Electric fan blowing can lower the indoor temperature

C. Electric fan blowing can accelerate the evaporation of human sweat and take away the heat from the skin.

D. All the above statements are correct

5. (2018·Shandong Jinan Experimental Middle School Mid-term) Before giving the patient an injection, the nurse usually uses alcohol cotton balls to disinfect the injection site. At this time, the patient will feel _________(optional "hot" or "cold") ), the reason is that ________ (fill in the name of the change in physical state) will occur when alcohol is applied there.

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Update Time: 2024-10-17

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

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