chapter: chemical reaction and equation
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Dear Curious I am sorry to say but your picture does not seems in good quality so it's pretty hard to understand it
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A chemical reaction is described by a chemical equation, an expression that gives the identities and quantities of the substances involved in a reaction. A chemical equation shows the starting compound(s)—the reactants—on the left and the final compound(s)—the products—on the right, separated by an arrow.
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