Halogenid, del 1:
https://www.youtube.com/watch?v=QeAa7_7km-E
Halogenid, del 2
https://www.youtube.com/watch?v=P6TGSaBHsZk
Øvelse 4, del 1:
https://www.youtube.com/watch?v=lainfSIcc6c
Øvelse 4, del 2:
https://www.youtube.com/watch?v=2pssDggP42w&t=38s