chemical reactivity

Question 1

When does a reaction occur ?

4 points

Answer 1

1. Correct geometry
2. Required activation energy
3. Orbital overlap
4. Favourable energetics

Question 2

What happens when molecules collide?

Answer 2

A reaction occurs by the transfer of electrons when orbitals overlap; electron transfer from HOMO to LUMO

Question 3

Describe an electrophile

Answer 3

1. They are Lewis acids ( they accept a lone pair of electrons from a nucleophile )
2. They are electron deficient
3. They have a LUMO

Question 4

Describe a nucleophile

Answer 4

1. They have a pair of electrons that they can donate
2. They are electron rich e.g.
   Pi bonds
   Anions
   Lone pairs

Question 5

What direction do curly arrows point in ?

Answer 5

Curly arrows point in the direction of electron movement, so from the electron density ( NUCLEOPHILE ) to the electron deficiency ( ELECTROPHILE )