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There are 6 indicators of a chemical reaction: 1) change in color ex: iron (grey) +oxygen (colorless) = rust (orange) 2) change in taste ex: burnt toast 3) heat is added or released ex: cooking food (heat added) 4) change in smell ex: rotting milk 5) gas is formed ex: baking soda + vinegar = "mini volcano" 6) formation of a solid ex: rotted milk has clumps

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