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"Melting and Solidification" PPT courseware
Part One: Three States of Matter:
Take water as an example:
Ice rain, white gas, fog, dew, frost, snow, hail, water vapor
Solid: ice frost snow hail
Liquid: rain, fog, dew, white gas
Gaseous state: water vapor (invisible to the human eye)
Melting and solidification PPT, part 2 content: step-by-step learning
1. Melting: The process in which a substance changes from solid to liquid.
2. Solidification: The process of matter changing from liquid to solid
3. What conditions are needed for substances to melt and solidify? Are the laws of melting and solidification of different substances the same?
Explore questions:
1. What conditions are needed for the melting and solidification of substances? Are the laws of melting and solidification of different substances the same?
2. Does a solid turn into a liquid all at once during the melting process or is there a process?
3. How does the temperature of a solid change during the melting process?
FAQ:
1. Why use the outer flame of an alcohol lamp for heating?
The outer flame of the alcohol lamp has the highest temperature.
2. What is the role of asbestos net?
Let the beaker heat evenly.
3. Why should the test tube be placed in the beaker of water?
Medium heat?
Allow the test tubes to heat as evenly as possible. (water bath method)
Melting and Solidification PPT, Part 3: Melting and Solidification
1. The concepts of melting and solidification:
1. Melting: The process by which a substance changes from solid to liquid.
2. Solidification: The process by which a substance changes from liquid to solid.
2. Explore the changing rules of temperature when solid melts:
1. The sea waves continue to absorb heat during the melting process, and the temperature remains constant.
2. Paraffin wax continues to absorb heat during the melting process, and the temperature gradually rises.
3. Understand the melting curve of solids.
3. Melting point and freezing point:
1. Crystal: A solid with a certain melting temperature.
2. Melting point: The temperature at which a crystal melts.
3. Amorphous: A solid that does not have a definite melting temperature.
4. Freezing point: The temperature at which a crystal solidifies.
5. The melting point and freezing point of the same substance are the same, while the melting points of different substances are different.
4. Melting absorbs heat and solidifies releases heat:
Any substance absorbs heat when it melts and releases heat when it solidifies.
Melting and Solidification PPT, Part 4 Contents: Table Reading:
1. Remember the melting points of sodium thiosulfate (commonly known as sea wave) and ice.
2. Among common metals, tungsten has the highest melting point (3410°C)
Exercise: 1. Can aluminum be melted in a tin pot?
2. Check the table to determine the states of the following substances at the following temperatures?
Ocean waves at 47ºC _______. Mercury at -38ºC_______.
-15ºC water ________. Pure iron at 1536ºC_______.
Ocean waves at 48ºC___________________________.
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"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..
"Exploring the Characteristics of Melting and Solidification" Material Forms and Their Changes PPT Courseware:
"Exploring the Characteristics of Melting and Solidification" Material Forms and Changes PPT Courseware Teaching Objectives 1. Know what melting and solidification are, and understand the heat absorption of melting and the heat release of solidification. 2. Know the melting and solidification characteristics of crystals and amorphous crystals. Understand the physical meaning of melting curves. ..