Submicroscopic Models of Chemical Change

Question 1

Reaction mechanism

Answer 1

the step by step sequence of simple reactions by which an overal reaction occurs

Question 2

Elementary reaction

Answer 2

a chemical reaction that has only a single transition state

Question 3

Unimolecular elementary reactions

Answer 3

involves the rearrangement of single reactant molecule to produce one or more product molecules

Question 4

Bimolecular elementary reactions

Answer 4

the collision and reaction of 2 molecules/atoms in an elementary reaction

Question 5

Example of unimolecular elementary reactions

Answer 5

bond breaking, isomerization

Question 6

Example of bimolecular elementary reactions

Answer 6

concerted bond breaking/forming

Question 7

Trimolecular Elementary Reactions

Answer 7

simultaneous collision of 3 atoms/molecules

Question 8

Are trimolecular elementary reactions likely

Answer 8

No, and they would be very slow

Question 9

Reaction intermediate

Answer 9

an atom or molecule that is a product in an earlier step and reacts away in a later step

Question 10

Exergonic

Answer 10

free energy of the products is lower than reactants

Question 11

Endergonic

Answer 11

products are higher free energy than reactants

Question 12

Coupled reactions

Answer 12

occur simultaneously and there is a means of exchanging energy between them

Question 13

When will a coupled reaction be product favored?

Answer 13

when ∆Gºoverall<0