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? 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 catalys
Answers
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: The test tube contains the catalyst. The test tube that bubbles out contains the catalyst
Reason for the answer: The reaction would proceed only in the presence of the catalyst. So from the test tube where the bubbles came out contains the Catalyst.
The test tube that stops bubbling first contains the catalyst.
The job of the catalyst is to speed the reaction and finish it at the earliest.
When the catalyst is added, due to the release of heat it becomes exothermic reaction which results in bubbles.
The test tube that stops bubbling first contains the catalyst as the reaction is over the earliest which means there is catalyst due to which the speed of the reaction has improved.