Catalysts - BAMS Cohort 6 Flashcards

Questions and Answers

Which is the best definition of activation energy?

The energy required to re-form bonds in product molecules

The energy required to bind a substrate to an active site

The energy required to break the bonds of reactant molecules (correct)

The energy required to end a chemical reaction

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

The rate would remain the same.

The rate would decrease.

The rate would go up and down.

The rate would increase. (correct)

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

Product

Reactant

Enzyme (correct)

Substrate

What is a substrate?

A reactant that is catalyzed by an enzyme Signup and view all the answers

Photosynthesis is an example of?

An endothermic reaction. Signup and view all the answers

What is the best method for a researcher to determine if substance A affects the reaction rate of liquids X and Y?

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. Signup and view all the answers

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

Enzyme and substrate Signup and view all the answers

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

catalyst Signup and view all the answers

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

The amount of catalyst is the same at the end as at the beginning of the reaction. Signup and view all the answers

Which statement best describes how a catalyst can speed up a chemical reaction?

The catalyst makes lower energy pathways available. Signup and view all the answers

Study Notes

Activation Energy

Activation energy is the energy required to break the bonds of reactant molecules in a chemical reaction.
Lowering activation energy increases the reaction rate.

Enzymes

Lactase and carbonic anhydrase are examples of enzymes, which are catalysts that speed up reactions.
Enzymes bind to substrates through a lock-and-key mechanism, allowing for specific reactions to occur.

Substrates

A substrate is a reactant that is catalyzed by an enzyme, facilitating the conversion into products during a reaction.

Photosynthesis

Photosynthesis is categorized as an endothermic reaction, which absorbs energy rather than releasing it.

Catalyst

A catalyst is a substance that influences a reaction's rate without being consumed in the process; it remains unchanged after the reaction.
The amount of catalyst present at the end of a reaction is the same as at the beginning.

Experimental Methodology

To determine if an inorganic substance (A) affects the reaction rate of colored liquids (X and Y), the time taken for the liquid to become clear should be measured with and without substance A.
This approach identifies whether substance A acts as a catalyst.

Catalyst Mechanism

A catalyst speeds up a chemical reaction by making lower energy pathways available, facilitating the reaction without altering the reactants or products’ concentration directly.

Description

Test your understanding of catalysts and activation energy with these flashcards designed for BAMS Cohort 6. Each card presents definitions and critical concepts related to chemical reactions and their energetic contexts. Perfect for quick reviews and enhancing your grasp of biochemistry.