Chemistry: Catalysts Flashcards

Questions and Answers

Which statement correctly describes a chemical reaction?

Bonds between atoms break and reform.

Photosynthesis is an example of

an endothermic reaction

The lock-and-key mechanism refers to

the complementary shapes of an enzyme and a substrate.

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 decreases the reaction energy needed. Signup and view all the answers

Which is the best definition of activation energy?

the energy required to form or break the bonds of reactant molecules Signup and view all the answers

How does a catalyst work?

by decreasing the activation energy of a reaction Signup and view all the answers

How can the student identify the catalyst in the experiment?

The test tube that stops bubbling first contains the catalyst. Signup and view all the answers

Which term describes an enzyme?

catalyst Signup and view all the answers

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

enzyme Signup and view all the answers

Study Notes

Chemical Reactions

Chemical reactions involve breaking and reforming bonds between atoms.
The amount of a catalyst remains unchanged before and after the reaction.

Photosynthesis

Photosynthesis is categorized as an endothermic reaction, meaning it absorbs energy.

Enzyme Function

The lock-and-key mechanism illustrates how enzymes and substrates fit together due to their complementary shapes.
Enzymes act as catalysts, accelerating reactions without being consumed.

Reaction Dynamics

Catalysts enhance the speed of a reaction by lowering the activation energy required for the reaction to occur.
Activation energy is defined as the energy needed to break or form bonds of reactant molecules.

Experimental Methodology

In an experiment involving substances X, Y, and Z, only one serves as a catalyst in the reaction between A and B to produce C.
The effectiveness of the catalyst can be determined by identifying which test tube stops bubbling first during the reaction.

Examples of Enzymes

Lactase and carbonic anhydrase are specific types of enzymes, which are biological catalysts that facilitate various chemical reactions.

Description

Test your knowledge of catalysts and chemical reactions with these flashcards. Each card presents important concepts such as photosynthesis, enzyme mechanisms, and the role of catalysts. Perfect for students looking to reinforce their understanding of chemistry.