Phase Changes (Changes of State). CA State Content Standards 3e. Students know that in solids the...
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Transcript of Phase Changes (Changes of State). CA State Content Standards 3e. Students know that in solids the...
![Page 1: Phase Changes (Changes of State). CA State Content Standards 3e. Students know that in solids the atoms are closely locked in position and can only vibrate;](https://reader036.fdocuments.us/reader036/viewer/2022062306/5a4d1b8d7f8b9ab0599bfd0b/html5/thumbnails/1.jpg)
Phase Changes(Changes of State)
![Page 2: Phase Changes (Changes of State). CA State Content Standards 3e. Students know that in solids the atoms are closely locked in position and can only vibrate;](https://reader036.fdocuments.us/reader036/viewer/2022062306/5a4d1b8d7f8b9ab0599bfd0b/html5/thumbnails/2.jpg)
CA State Content Standards3e. Students know that in solids the atoms are closely locked in position and
can only vibrate; in liquids the atoms and molecules are more loosely connected and can collide with and move past one another; and in gases the atoms and molecules are free to move independently, colliding frequently.
5d. Students know physical processes include freezing and boiling, in
which a material changes form with no chemical reaction.
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Melting
SolidLiquidAs particles heat up, they gain kinetic energy and break loose and slide past one another.
•In most pure substances, melting occurs at a specific temperature, called the melting point. The melting point depends on how strongly its particles are attracted.
Ex: Melting candle wax
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Freezing
Liquid SolidWhen the temperature is lowered, its
particles lose energy and move more slowly. The attractions as they move slowly cause them to become a solid.
ICE
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Freezing
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Vaporization
• LiquidGasThe particles become too spread out and the attractive forces are too weak to keep
the particles close together.
![Page 7: Phase Changes (Changes of State). CA State Content Standards 3e. Students know that in solids the atoms are closely locked in position and can only vibrate;](https://reader036.fdocuments.us/reader036/viewer/2022062306/5a4d1b8d7f8b9ab0599bfd0b/html5/thumbnails/7.jpg)
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Condensation
• GasLiquid• Occurs when thermal energy is removed,
particles move closer, and attractive forces hold them together.
![Page 9: Phase Changes (Changes of State). CA State Content Standards 3e. Students know that in solids the atoms are closely locked in position and can only vibrate;](https://reader036.fdocuments.us/reader036/viewer/2022062306/5a4d1b8d7f8b9ab0599bfd0b/html5/thumbnails/9.jpg)
Sublimation
• Solid directly to a gas (skips the liquid stage)
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Deposition (desublimation)
• Gas to a solid without going through the liquid state
• An example is water vapor changing directly to ice as frost on leaves.
![Page 11: Phase Changes (Changes of State). CA State Content Standards 3e. Students know that in solids the atoms are closely locked in position and can only vibrate;](https://reader036.fdocuments.us/reader036/viewer/2022062306/5a4d1b8d7f8b9ab0599bfd0b/html5/thumbnails/11.jpg)
Adding thermal energy (heat)
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Taking away thermal energy (heat)
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Brainpop
• Matter changing states
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How can matter change from one state to another?
• Particles are constantly moving• Change in energy changes particle motion• Higher temperature causes particles to
move faster
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