write the evidences of chemical reaction
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⇒Change of odor.
⇒Change of color (for example, silver to reddish-brown when iron rusts).
⇒Change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat.
⇒Change of composition - paper turning to ash when burned.
⇒Light and/or heat given off.
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A color change, formation of a precipitate or a gas, or temperature changes are the evidences of a chemical reaction.
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