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Chemistry
Chemistry
Chemical Changes
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Burning wood
Baking a cake
Fireworks exploding
Iron rusting
Milk gone sour
Not easily reversible
Substances change
Physical Changes
Changes are reversible
Properties change
Includes changes in states of matter
Substances remain unchanged
Endothermic Reactions
Energy breaking bonds
Reactants + Energy ---> Product
EXAMPLES
Cooking eggs
Melting solid salts
Exothermic Reactions
More energy released
Reactants ---> Products + Energy
EXAMPLES
Crystallizing liquid salt
Nuclear fission
