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Physical ChangesChapter 7 Lesson 3
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Physical ChangeA change in size, shape, form, or state of
matterMatter’s identity stays the sameMatter does not become something different
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State of MatterMovement of particles must changeThermal energy (heat) is added or removed
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Adding Thermal EnergyParticles move fasterTemperature increasesSolid to Liquid
Particles move too fast for attractive force to hold them together – reaches melting point
Liquid to GasParticles move too fast for attractive force to
hold them together – reaches boiling point
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SublimationSolid changes directly into a gas without first
being a liquid Example: dry ice (frozen carbon dioxide), solid
iodine
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Removing Thermal EnergyParticles slow downTemperature decreasesGas to liquid
Particles slow down enough for attractive forces to pull the particles close together – condensation
Liquid to solidParticles slow down enough for attractive
forces to pull the particles close together - freezing
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Freezing and meltingReverse processesOccur at the same temperature
Boiling and condensationReverse processesOccur at the same temperature
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DepositionGas changes directly into a solid without first
being a liquid Example: frost
Opposite of sublimation
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DissolvingPhysical change because the identities of the
substances have not changedExample: salt water
Can be reversed by boiling
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Conservation of MassMass is conserved because it remains the
same after a change, such as a physical change
The particles of matter that are present before a physical change are the same as those present after the physical change
If a sample of water has a mass of 200 g and the final solution has a mass of 230 g, how much solute dissolved in the water?