chapter 12

Question 1

effect of chain length on bp (alkanes)

Answer 1

• as the chain length increases, there is a larger surface area so more surface contact is possible
• London forces will be greater so more energy is required to overcome the forces

Question 2

effect of branching on bp (alkanes)

Answer 2

-fewer surface contact- fewer London forces

Question 3

radical substitution, bromine & CH4

Answer 3

-inititation Br–Br –> Br* + Br*

-propagation 1 CH4 + Br* –> *CH3 + HBr
2 CH3 + Br2 –> CH3Br + Br

• termination Br* + *Br –> Br2
• CH3 + *CH3 –> C2H6
• CH3 + *Br –>CH3Br