Reaction Mechanisms

Question 1

how many shared pairs of electrons are there when there is a covelant bond between 2 atoms?

Answer 1

a shared pair of electrons

Question 2

how many shared pairs of electrons are there when there is a double bond between 2 atoms?

Answer 2

two shared pairs of electrons

Question 3

what do mechanisms show?

Answer 3

1- bond breaking
2-bond making
3-movement of electrons

Question 4

what does a single headed curly arrow mean?

Answer 4

indicates one electron moving

involved radical reactions

Question 5

what does a double headed curly arrow mean?

Answer 5

indicates two electrons moving

reactions do not involve radicals

Question 6

where can curly arrows only be drawn from?

Answer 6

• a bond

- an electron or electron pair

Question 7

where can curly arrows be drawn to?

Answer 7

• the region between two atoms (i.e when two electrons become shared)
• an atom
  (i. e.when an atom takes sole possession of electron or electrons)

Question 8

does bond formation have to involve two ions?

Answer 8

no

Question 9

how many curly arrows can be drawn in a single mechanistic step?

Answer 9

usually 2 pairs but can be more

Question 10

do mechanisms need to be balanced in terms of charges?

Answer 10

yes