reactions of organic molecules

Question 1

what is the purpose of the ozone layer

Answer 1

filters UV rays to stop skin cancer

Question 2

define fission

Answer 2

breaking of a covalent bond to give 2 atoms

Question 3

define homolytic fission

Answer 3

breaking of a covalent bond with one of the bond electrons going to each atom

Question 4

what does homolytic fission produce

Answer 4

2 free radicals

Question 5

define heterolytic fission

Answer 5

the breaking of a covalent bond with both of the bonded electrons going to one of the atoms forming a cation (+) and an anion (-)

Question 6

what does heterolytic fission produce

Answer 6

2 ions

Question 7

define radical

Answer 7

a species with an unpaired electron

Question 8

what are the 3 stages of a chain reaction

Answer 8

1. initiation
   (1 equation)
2. propagation
   (2 equations)
3. termination
   ( 3 equations)

Question 9

what happens during initiation

Answer 9

homolytic fission of halogen molecule to form radicals

Question 10

what happens during propagation

Answer 10

radicals attack the alkane

Question 11

what happens during termination

Answer 11

2 radicals combine to form a molecule and the reaction ends

Question 12

what is needed during the initiation stage to allow the 2 radicals to be formed

Answer 12

UV light

Question 13

what type of reaction is this

C6H14 + Br2 –> C6H13Br + HBr

Answer 13

free radical substitution