AQA GCSE CHEMISTRY REVISION- C1.4 CRUDE OIL AND
FUELS QUESTIONS WITH CORRECT ANSWERS 2026
Hydrocarbon - CORRECT ANSWER -A compound containing only hydrogen and carbon
Alkane - CORRECT ANSWER -ABsaturated hydrocarbon.
Saturated Hydrocarbon - CORRECT ANSWER -There is a single carbon-
carbon bond and no more hydrogen atoms can be added.
Where did crude oil come from? - CORRECT ANSWER -
Animals and plants sink to the bottom of the sea when they die, but do not decay as their is no oxygen f
or the bacteria to feed on. They are kept under high pressure and high temperatures so become crude o
il. This process takes millions of years.
Explain Fractional Distillation - CORRECT ANSWER -
Hot crude oil vapour is pumped into the bottom (the hottest part) of the fractionating column. As crude
oil is a mixture of hydrocarbons, as the vapour rises, and the temperature decreases different hydrocarb
ons with high-low boiling points condense and are pumped out of the column.
Properties of Hydrocarbons - CORRECT ANSWER -Long chain have:
high boiling points
low flammability
high viscoity
low volatillity
a smoky flame
Short chain have:
low boiling points
high flammability
low viscosity
high volatillity
FUELS QUESTIONS WITH CORRECT ANSWERS 2026
Hydrocarbon - CORRECT ANSWER -A compound containing only hydrogen and carbon
Alkane - CORRECT ANSWER -ABsaturated hydrocarbon.
Saturated Hydrocarbon - CORRECT ANSWER -There is a single carbon-
carbon bond and no more hydrogen atoms can be added.
Where did crude oil come from? - CORRECT ANSWER -
Animals and plants sink to the bottom of the sea when they die, but do not decay as their is no oxygen f
or the bacteria to feed on. They are kept under high pressure and high temperatures so become crude o
il. This process takes millions of years.
Explain Fractional Distillation - CORRECT ANSWER -
Hot crude oil vapour is pumped into the bottom (the hottest part) of the fractionating column. As crude
oil is a mixture of hydrocarbons, as the vapour rises, and the temperature decreases different hydrocarb
ons with high-low boiling points condense and are pumped out of the column.
Properties of Hydrocarbons - CORRECT ANSWER -Long chain have:
high boiling points
low flammability
high viscoity
low volatillity
a smoky flame
Short chain have:
low boiling points
high flammability
low viscosity
high volatillity
