5.9 I can describe the trend in boiling point and viscosity of the main fractions

a. What is the trend in boiling point of the fractions?
The fractions nearer to the top of the column have a lower boiling point than the ones at the bottom.

b. Define viscosity (source your definition)
Viscosity is the quantity that describes a fluid's resistance to flow. (physics.info)

c. What is the trend in viscosity of the fractions?
The more viscous fractions are collected nearer to the bottom.


d. What is the trend in colour of the fractions?
As we go down the fractions, the colour of each fraction gets darker.

e. Why is crude oil separated into fractions?
So it can be used, and serve a purpose.

f. What process is used to separate crude oil into fractions?
Fractional distillation.

g. What physical property allows this process to work?
The different boiling points of each fraction.