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Reactions and Changes (Physical Changes (Actions (Cutting, Crumpling),…
Reactions and Changes 
Physical Changes
Some properties change, substances stay the same
Ex: butter melting :
Some can be reversed
Ex: braiding hair
Some cannot
Ex: cutting hair
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Endothermic Changes
more energy is required to break the bonds in the reactants than is released by the formation of the products.
Ex: A ice cube melting
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Exothermic Reactions
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examples
formation of ice cube
fire