The sentence best describes how the concentration of the reactant changed is it decreased gradually as the reaction progressed.
The correct option is B.
The chemical reaction is the reaction between two reactants which led to the formation of products.
The products are substances which forms after reaction. The reactants are the substances which are original materials.
This graph shows how the concentration of a reactant changed during a chemical reaction.
The sentence best describes how the concentration of the reactant changed is it decreased gradually as the reaction progressed.
Thus, the correct option is B.
Learn more about chemical reaction.
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