phase changes. kinetic theory of matter matter is made up of particles which are in continual random...
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PHASE CHANGES
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KINETIC THEORY OF MATTER
Matter is made up of particles which are in continual random motion.
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WHAT ARE THE 4 STATES OF MATTER?
SolidSolidPlasmaPlasma
GasGas
LiquidLiquid
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SOLIDS:• Solids have a definite shape and volume
• usually organized, crystalline solidcrystalline solid
• Softer solids will have no pattern, amorphous solidamorphous solid.
• packed tightly together• Vibrate in place
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PARTICLES IN LIQUIDS:• Liquids have a definite volume
• Liquids take the shape of their container.
• Liquids are a fluid • Far enough apart to slide over one another
• Energy level is greater than in solids
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PARTICLES IN GASES:• No definite volume or
shape.• Gasses spread out to fill the entire space given.
• Can be squeezed together• Particles are very far apart and move freely
• Collide frequently• Have LOTS of energy
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PARTICLES IN PLASMA:
• Plasma is a lot like a gas, but the particles are electrically charged.
• Have indefinite shape and volume.
• EXTREMELY energetic• Lightning is a plasma.• Used in fluorescent light
bulbs and Neon lights.
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STATES OF MATTER
SOLID LIQUID GAS PLASMA
Tightly packed, in a regular
patternVibrate, but do not move from place to place
Close together with no regular arrangement.Vibrate, move
about, and slide past each other
Well separated with no regular arrangement.Vibrate and
move freely at high speeds
Has no definite volume or shape
and is composed of electrical charged
particles
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WHAT IS A PHASE CHANGE?
• A change from one state of matter to another
• Phase changes are physical changes because they do not affect the chemical make up of a substance.
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WHAT HAPPENS DURING A PHASE CHANGE?
• During a phase change heat energy is either absorbed or released
• Heat energy is released as molecules slow down and move closer together- exothermicexothermic
• Heat energy is absorbed as molecules speed up and expand-endothermicendothermic
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MELTING
• Phase change from a solid to a liquid
• Molecules speed up, move farther apart, and absorb heat energy
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FREEZING
• Phase Change from a liquid to a solid
• Molecule slow down, move closer together and release heat energy.
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VAPORIZATION (BOILING)
• Phase change from a liquid to gas. It occurs at the boiling point of matter.
• Molecules speed up, move farther apart, and absorb heat energy.
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EVAPORATION
• Phase change from a liquid to a gas on the surface of a liquid (type of vaporization).
• Molecules speed up, move farther apart, and absorb heat energy.
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CONDENSATION
• Phase change from a gas to a liquid.
• Molecule slow down, move closer together and release heat energy.
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SUBLIMATION
• Phase change from a solid to a gas.
• Molecules speed up, move farther apart, and absorb heat energy.
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DEPOSITION
• Phase change from a gas to a solid.
• Molecules slow down, move closer together and release heat energy.
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PHASE CHANGE OF WATER1. Why is there no
change in temperature during a phase change?
2. Define melting and boiling point.
3. What is the melting and boiling point of water?
4. At what temperature does water freeze and become a solid?