What chapter is it in Janet Fitch's White Oleander where Davey and Astrid talk about how to commit suicide?

There's a part where her and Davey are talking about suicide, and how the best way to do it would be to stick a syringe in one of your veins and insert an air bubble.

What chapter is it in Janet Fitch's White Oleander where Davey and Astrid talk about how to commit suicide?
in the movie i think its when they are in the home together.