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Reactant What is it? A reactant is one of the chemicals that comes together to react with other chemicals. When writing an equation for a chemical reaction, reactants are always to the left of the arrow. Give me an example! Have you ever made chocolate milk using powdered mix? The powder and the milk are the reactants - and the chocolate milk you end up with is the product. Copyright ©2010, PCS Edventures, Inc. All Rights Reserved.