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what is a reaction (chemistry)
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A reaction or chemical reaction is a chemical change which forms new substances. In other words, reactants react to form products that have a different chemical formula. Indications a reaction has occurred include temperature change, color change, bubble formation, and/or precipitate ᎰᎾᏒᎷᎯᎿᎨᎾᏁ.
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A chemical reaction is one in which a chemical change took place.
for eg burning of magnesium
digestion of food etc.
2Mg+O2 -2 MgO
in this reaction the element on the left side are called reactant and right side are called product
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