"Melting and Solidification" Changes in State of Matter PPT Courseware 3

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"Melting and Solidification" Changes in State of Matter PPT Courseware 3

1. Three states and changes of matter

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

2. The change of matter from one state to another is called change of state of matter

3． melting and solidification

2. Explore the rules of temperature changes during solid melting

(1) Experimental device:

(2) Precautions during the experiment: Safety in the use of alcohol lamps

(3) Hypo and paraffin melting data table

(4) Melting curve analysis of sea wave and wax:

① What is the state of the sea wave during the period of time corresponding to the AB segment curve? How does the temperature change?

② At which point on the curve does the sea wave begin to melt?

③ What is the state of the sea wave during the period corresponding to segment BC? Does the temperature change? Was the sea wave heated during this time?

④ What is the state of the sea wave in the time period corresponding to the CD segment? How does the temperature change?

3. Melting

Common crystals and amorphous

Crystal: sea wave, ice, salt, naphthalene, various metals

Amorphous: wax, rosin, glass, asphalt

1. Crystals have a certain melting temperature; amorphous materials do not have a certain melting temperature.

2. Melting point: The temperature at which a crystal melts.

3． Crystal melting conditions:

(1) Reach the melting point;

(2) Continue to absorb heat.

4. Solidification

1. There is a definite temperature when a crystal solidifies; there is no definite temperature when a non-crystal solidifies.

2. Freezing point: The temperature at which a liquid crystalline substance solidifies.

For the same crystalline substance, freezing point = melting point.

3． Crystal solidification conditions:

(1) Reach the freezing point;

(2) Continue to release heat.

5. Melting absorbs heat and solidifies releases heat

explain phenomenon

If you take the melting ice into a room with a temperature of 0°C, will the ice continue to melt?

In summer, ice at 0℃ or water of equal mass at 0℃ is used to cool soda. The result is ( )

A. The effect of using ice is better because the temperature of ice is low

B. Using water works well because water absorbs heat more easily than ice

C. The effect of using ice is good because the temperature of ice's heat absorption does not change.

D． Both have the same effect

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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: 2024-08-31

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

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