Question

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?

Answer 1

The way that the student can identify the catalyst is by finding out the test tube that stop bubbling first
The catalyst that added will speed up the reaction and will speed up the bubbling process

hope this helps

Answer 2

Thank you for posting your question here. Below are the choices:

The test tube that stops bubbling first contains the catalyst.
The test tube that produces the most bubbles contains the catalyst.
The test tube that bubbles the longest contains the catalyst.
The test tube that does not bubble contains the catalyst.

The answer is "The test tube that stops bubbling first contains the catalyst."