Catalysts

Question 1

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?

Revolt · Accepted 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.

Question 2

If the activation energy required for a chemical reaction were reduced, what would happen to the rate of the reaction?

Revolt · Accepted Answer

The rate would increase.

Question 3

A student wants to create a liquid volcano. The student observes bubbles in the soft drink prior to opening it. The student first proceeds to open the soft drink bottle and place it on the floor.Next the student drops candy tablets into the drink at a continuous pace. The student notices a very powerful reaction in which the candies, still intact, are pushed out of the soda as the drink fizzes and starts to bubble.In this scenario, what would be the catalyst?

Revolt · Accepted Answer

The candy tablets being added to the drink.

Question 4

Which two substances bind using a lock-and-key mechanism?

Revolt · Accepted Answer

enzyme and substrate

Question 5

A substance that influences the reaction but does not participate in the reaction is a

Revolt · Accepted Answer

catalyst

Question 6

Which statement correctly describes a chemical reaction?

Revolt · Accepted Answer

Bonds between atoms break and reform.

Question 7

Which is the best definition of activation energy?

Revolt · Accepted Answer

the energy required to form or break the bonds of reactant molecules

Question 8

Which statement best describes the amount of catalyst that remains at the end of a reaction?

Revolt · Accepted Answer

The amount of catalyst is the same at the end as at the beginning of the reaction.

Question 9

Lactase and carbonic anhydrase are examples of what type of substance?

Revolt · Accepted Answer

enzyme

Question 10

Which component is released from the active site of an enzyme during a chemical reaction?

Revolt · Accepted Answer

product

Catalysts Answers

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