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Chemistry 11 Online
OpenStudy (anonymous):

When two intermediate chemical equations are combined, the same substance that appears in the same phase can be canceled out, provided that A) it is a reactant in one intermediate reaction and a catalyst in the other reaction. B) it is a product in one intermediate reaction and a catalyst in the other reaction. C) it is a reactant in one intermediate reaction and a product in the other reaction. D) it is a reactant in both of the intermediate reactions.

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