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Reactions and Changes (Endothermic Reaction (Absorbs energy (Product…
Reactions and Changes
Physical Changes
Properties change
Freeze
liquid to solid
Boiling
Liquid plus heat
Evaporation
Liquid to gas
Condensation
gas to liquid
Vaporization
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Chemical Change
Reacts
Forms different substance
Common evidence
Production of Gas
Formation of precipitate
Changes Color
Examples
Leaves changing color
Digesting food
Cake being baked
Ripening (Banana Peel)
Photosynthesis
Exothermic Reaction
releases energy
Combustion
Combustion of Methane
Nuclear Bomb
Burning Candles
Condensation
Endothermic Reaction
Absorbs energy
Product Energy
Reactant Energy
Process:
Major Energy
Breaks bonds
Releases
Examples:
Mercury (II)
Heated to 450* C
Breaks down
Mercury and Oxygen
