What property of hexane, dichloromethane and water allowed us to layer them?

Project description
Write a discussion on Solubility and Miscibility by addressing the following points
1.Existing knowledge, research and views:
How is polarity determined?
What are the rules for solubility and miscibility?
What property of hexane, dichloromethane and water allowed us to layer them?

2.Limitations and implications:
Why doesnt hexane mix with water?
Why doesnt dichloromethane mix with water?
Why does dichloromethane mix with hexane?
Why does I2 dissolve in hexane? What about dichloromethane? Why doesnt it dissolve in water?
Why does KI dissolve in water and not hexane?