when two intermediate chemical equations are combined, the same substance that appears in the same phase can…

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

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

Answer

Brief Explanations:

In chemical equation combination, a substance can be canceled when it is a reactant in one step and a product in another. This is because it is consumed in one reaction and then regenerated in another, not being part of the overall - reaction net result.

Answer:

it is a reactant in one intermediate reaction and a product in the other reaction.