Home Chemistry Catalysts
Please enter something

Catalysts

avatar
Jul 12th, 2023
4.7 (114 reviews)
10 test answers
question
Which statement best describes how a catalyst can speed up a chemical reaction?
answer
The catalyst makes lower energy pathways available.
question
What is a substrate?
answer
a reactant that is catalyzed by an enzyme
question
How does a catalyst work?
answer
by decreasing the activation energy of a reaction
question
What must happen before a chemical reaction can begin?
answer
The activation energy must be reached.
question
A substance that influences the reaction but does not participate in the reaction is a .
answer
catalyst
question
The lock-and-key mechanism refers to
answer
the complementary shapes of an enzyme and a substrate.
question
Which two substances bind using a lock-and-key mechanism?
answer
enzyme and substrate
question
Lactase and carbonic anhydrase are examples of what type of substance?
answer
enzyme
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
NO The test tube that produces the most bubbles contains the catalyst.
question
A researcher is designing a laboratory experiment to determine whether the inorganic substance A affects the rate of a reaction between two colored liquids, X and Y. When the reaction is complete, the liquid is clear. The reaction between X and Y is similar to one used by manufacturers to produce certain chemicals in factories.Which method would best answer his question about reaction rate and what will he find out about substance A?
answer
First, he should measure how long it takes for the liquid to become clear if X and Y are mixed together. Then, he should measure how long it takes if he also adds substance A to X and Y. He will find out if substance A is a catalyst.
1 of 10
question
Which statement best describes how a catalyst can speed up a chemical reaction?
answer
The catalyst makes lower energy pathways available.
question
What is a substrate?
answer
a reactant that is catalyzed by an enzyme
question
How does a catalyst work?
answer
by decreasing the activation energy of a reaction
question
What must happen before a chemical reaction can begin?
answer
The activation energy must be reached.
question
A substance that influences the reaction but does not participate in the reaction is a .
answer
catalyst
question
The lock-and-key mechanism refers to
answer
the complementary shapes of an enzyme and a substrate.
question
Which two substances bind using a lock-and-key mechanism?
answer
enzyme and substrate
question
Lactase and carbonic anhydrase are examples of what type of substance?
answer
enzyme
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
NO The test tube that produces the most bubbles contains the catalyst.
question
A researcher is designing a laboratory experiment to determine whether the inorganic substance A affects the rate of a reaction between two colored liquids, X and Y. When the reaction is complete, the liquid is clear. The reaction between X and Y is similar to one used by manufacturers to produce certain chemicals in factories.Which method would best answer his question about reaction rate and what will he find out about substance A?
answer
First, he should measure how long it takes for the liquid to become clear if X and Y are mixed together. Then, he should measure how long it takes if he also adds substance A to X and Y. He will find out if substance A is a catalyst.