"Melting and Solidification" PPT courseware on physical states and their changes

Description

"Melting and Solidification" PPT courseware on physical states and their changes

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

Solidification: The process of a substance changing from liquid to solid is called solidification

Question: What conditions are required for the melting and solidification of substances?

question ?

What conditions are required for the melting and solidification of substances?

Are the laws of melting and solidification of different substances the same?

Explore

1·Ask a question: Are the relationships between melting and temperature of different substances the same?

2. Establish hypotheses and conjectures: The melting of different substances is the same or different?

3. Make a plan: Instruments, sea wave experiment, rosin experiment

Like sea waves, those that have a certain melting temperature when melted are called crystals

Like rosin, it does not have a certain melting temperature when melting, it is called amorphous

According to the different melting characteristics of various solids, solids can be divided into two categories: crystalline and amorphous.

Melting point: The temperature at which a crystal melts

remember:

1. Different crystals have different melting points. The melting point is a characteristic of the crystal. Amorphous has no melting point.

2. Solidification: Crystals have a freezing point, and the freezing point and melting point of the same crystal are the same. Amorphous crystals have no freezing point.

Key takeaways from this section:

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

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

2. Solids are divided into crystalline and amorphous.

Crystals have melting points and freezing points when they melt and solidify.

The freezing point and melting point of the same crystal are the same.

Different crystals have different melting points, and the melting point is a characteristic of the crystal.

Amorphous materials have no freezing point or melting point.

3. The melting process must absorb heat, and the solidification process must release heat.

think

1. In Antarctica, the temperature often reaches minus 40 degrees Celsius. Can I use an alcohol thermometer to measure the temperature there? What about a mercury thermometer?

2. There is a saying that "it's not cold when it snows, it's cold when it melts". How do you understand it?

3. A cup of ice has partially melted. Put it in the sun. Before the ice has completely melted, what is the temperature of the ice? If it is placed in a room at -10°C, will all the water not freeze? ?

(greater than 0 oC, equal to 0 oC, less than 0 oC)

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For more information about the PPT courseware "Melting and Solidification States of Matter and Their Changes", please click the Melting and Solidification ppt State of Matter and Its Changes 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: 2024-11-25

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume one industry PPT template

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