Remember the pattern in the fractionating column with this phrase:
Small molecules = low BP = rise to TOP | Big molecules = high BP = stay at BOTTOM
Think of hot air balloons — lighter, smaller balloons (molecules) rise to the top; heavier, larger ones stay at the bottom.
Properties going UP the column — remember the acronym FILMS:
- F — more Flammable
- I — fewer (weaker) forces between molecules
- L — Less viscous (runnier)
- M — smaller Molecule size
- S — lower boiling point (Smaller Bp)
This memory aid covers Memory Aid: Size and Position within Crude Oil for GCSE Chemistry. Topic 37: Crude Oil It is section 10 of 13 in this topic. Use it for quick recall, then test yourself straight afterwards so the memory aid becomes usable in an answer.
Practice questions for Crude Oil
A hydrocarbon is a compound that contains only:
Explain how fractional distillation separates crude oil into different fractions.
Quick recall flashcards
What is a hydrocarbon?
A molecule made of hydrogen and carbon atoms ONLY
What is crude oil?
A mixture of many different hydrocarbons