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S  All chemical reactions result in the formation of a new substance. Chemical reactions can be identified by the formation of a new substance. Indicators of a chemical reaction can be Fizz, Aroma, Color change, Temperature Change, and Solid being formed.

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Bubbles are formed when Zinc reacts with Hydrochloric acid. The bubbles and gas are evidence of a chemical reaction
Reactants: HCl and Zn
Product: ZnCl₂ and  H₂

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When mold grows it gives off a smell. When mold grows on bread it creates a musty smell and the temperature also increases a little.
Reactants:
Product

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A color change can be an indicator of a chemical reaction.
When hydrogen peroxide is mixed with a combination of potassium iodide, starch, and sodium thiosulfate the colorless mixture suddenly turns dark blue.
Reactants: H₂O₂ + 2I− + 2H⁺
Product:  I₂ + 2H₂O

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During a chemical reaction there can be a change in temperature.
Air activated hand warmers work by reacting iron with air to form iron oxide.
Reactants:  Fe + O₂
Product: Fe₂O₃

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When a solid is formed as a result fo a chemical reaction it is called a precipitate.
Burning mercury(II) thiocyanate decomposes it into a brown mass that is carbon nitride.
Reactants:  ‎Hg(SCN)2 + Oxygen
Product: C₃N₄