"Melting and Solidification" Changes in State of Matter PPT Courseware 8

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"Melting and Solidification" Changes in State of Matter PPT Courseware 8

How to use a thermometer

Third look: range, graduation value, zero scale

One no: the glass bubble cannot touch the bottom or wall of the container.

Four essentials:

The glass bubble must be completely immersed in the substance being measured;

Wait until the indication stabilizes before taking a reading;

The glass bubble should remain in the substance being measured when reading;

The line of sight should be level with the upper surface of the liquid column.

Review the past and learn the new:

1. Temperature is a physical quantity that expresses the _________ degree of an object.

2. Commonly used thermometers are made by utilizing the properties of _________.

3. The Celsius temperature is 0oC. At one standard atmospheric pressure, the temperature of boiling water is _________.

4. The measuring range of the thermometer is __________, and the graduation value is _______.

5. As shown in the picture on the right, the measuring range is ________, the graduation value is ________, and the temperature currently represented is ________.

In this lesson you want

1. Understand the three states of matter, the changes in physical states, and what melting and solidification are.

2. Know what crystals and amorphous are, and what melting point and freezing point are. Understand the meaning of images of melting and solidification of crystals.

3. Understand melting endotherm and solidification exotherm.

Self-study guide one

There are 53 pages of self-study textbook. Answer the following questions after 2 minutes:

1. What are the states of matter?

There are three states of matter: solid, liquid, and gas.

2. What is the change of state of matter? What are the conditions for changes in the state of matter?

When the temperature changes, the changes between various states of matter are called changes in state of matter.

3. What is melting? What is solidification?

The process of a substance changing from solid to liquid is called melting.

The process of matter changing from liquid to solid is called solidification.

Observe images

What characteristics can you detect in the temperature changes of two substances during the melting process?

Cooperation and exchange

Crystal melting curve:

(1) The material in segment AB is in _____, indicating the crystal _____ process.

(2) The material in the BC segment is in the _____ state, indicating the crystal _____ process, absorption _____, and temperature _____.

(3) The material in segment CD is in _____, indicating the liquid _____ process.

(4) Point B means that the material has reached _____, but has not started to melt, and the material is completely in _____; Point C means that the crystal has just completely melted, and the material is in _____.

Apply what you learn

1. Use an electric soldering iron to solder the disconnected circuit. During this process, the physical state change of the solder is ( )

A. Melt B. Melt first and then solidify

C. Solidification D. First solidify and then melt

2. To heat the ice-water mixture, then ( )

A. The temperature of ice increases, but the temperature of water remains unchanged.

B. The temperature of the ice remains unchanged and the temperature of the water increases.

C. The temperature of the ice water increases together

D. When ice melts into water, the temperatures of both ice and water remain unchanged.

Summary experience

What did you learn in this lesson?

Have you accomplished your learning objectives?

1. What are melting and solidification?

2. What are crystals and amorphous?

3. What are melting point and freezing point? Understand the meaning of images of melting and solidification of crystals.

4. Understand melting endotherm and solidification exotherm.

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For more information about the "Melting and Solidification Changes in State of Matter" PPT courseware, please click the Melting and Solidification ppt Changes in State of Matter ppt tag.

"Melting and Solidification" PPT courseware:

Contents of the first part of the PPT courseware "Melt and Solidify": Three states of matter: Take water as an example: ice rain, white gas, fog, dew, frost, snow, hail Water vapor Solid state: ice, frost, snow and hail Liquid state: rain, fog, dew, white gas Gaseous state: water Vapor (invisible to the human eye) ... ...

"Melting and Solidification" PPT:

"Melt and Solidification" PPT Part 1 Content: State Changes Solid, liquid, and gaseous states are the three common states of matter. Solid state: such as aluminum, gold, silver, copper, iron, etc. are usually solid. Liquid state: such as water, vinegar, oil, etc. are usually liquid. Gaseous state: such as oxygen, hydrogen,...

"Exploring the Characteristics of Melting and Solidification" Material Forms and Their Changes PPT Courseware 2:

"Exploring the Characteristics of Melting and Solidification" Material Form and Its Changes PPT Courseware 2 Learning Objectives 1. Know what melting and solidification are. Understand the endotherms of melting and the exotherms of solidification. Know the characteristics of crystalline and amorphous melting and solidification. Understand the physical meaning of melting curves. 2. know..

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Update Time: 2024-07-30

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

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