Physical and Chemical Changes
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Transcript of Physical and Chemical Changes
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1. Which picture below represents atoms/molecules in a solid?
2. Which picture below represents atoms/molecules in a liquid?
3. Which picture below represents atoms/molecules in a gas?
A.
B.C.
C
B
A
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ReviewReviewStates of matter
Solid Liquid Gas Plasma
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Physical ChangePhysical Change
Change in matter that Change in matter that does notdoes not produce new produce new productsproductsMay look different, but itMay look different, but it’’s s notnot a new substance a new substance““EasilyEasily”” reversed reversed
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Physical ChangePhysical ChangeChemical properties are Chemical properties are notnot changed changedNo energy given or No energy given or taken taken unlessunless there is a there is a change of statechange of state
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Change of StateChange of StateMolecules gain or lose kinetic Molecules gain or lose kinetic energyenergyMelting/freezing, Melting/freezing, evaporating/condensation evaporating/condensation
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Change of StateChange of StateSublimationSublimation
Going from a solid to a Going from a solid to a gasgas
Skips the liquid stateSkips the liquid state
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Chemical ChangeChemical ChangeMatter changes from one Matter changes from one kind of material to anotherkind of material to anotherThe atoms The atoms do notdo not change changeThey rearrange themselvesThey rearrange themselvesNot Not ““easilyeasily”” reversed reversed
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Chemical ChangeChemical ChangeThe new substances The new substances have new propertieshave new propertiesChemical change takes Chemical change takes place during a chemical place during a chemical reactionreaction
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EnergyEnergyAlways a part of a Always a part of a chemical changechemical change
Given or takenGiven or taken