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A student designs an experiment to test substances X, Y, and Z, to determine which one is a catalyst for the reaction: A + B ® C. Only one of the unknown substances is a catalyst, and the others are nonreactive with A, B, or C. When 10 mL of A is added to 10 mL of B, the reaction takes twenty seconds. Bubbles form when the product C is created. The student prepares three test tubes, each containing both reactants A and B. She adds unknowns X, Y, and Z to test tubes 1, 2, and 3, respectively. She then times the reaction in each test tube from the point when the unknown is added until bubbling stops. How can the student identify the catalyst?

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meerkat18
The student can identify the catalyst by taking note of which among test tubes 1, 2, and 3 will produce bubbles in the shortest amount of time. This is because catalysts are added to reactions to speed up the process. If the ordinary reaction without a catalyst takes 20 seconds to proceed, it should be expected that the reaction with a catalyst will proceed faster than 20 seconds.

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