10 questions🇬🇧English
🛢️ Crude Oil & Fractional Distillation – GCSE
Chemistry · GCSE — hydrocarbons, alkanes, fractional distillation, properties of fractions and cracking
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Questions
Which of these best describes crude oil?
A mixture of carbon and hydrogen elements
A compound of carbon and oxygen
A mixture of many hydrocarbons
A single pure hydrocarbon
20s
What is the name of the alkane with 3 carbon atoms?
Butane
Propene
Ethane
Propane
20s
What is the general formula of the alkanes?
CₙH₂ₙ
CₙH₂ₙ₋₂
CₙH₂ₙ₊₂
CₙHₙ₊₂
20s
An alkane molecule contains 8 carbon atoms. What is its molecular formula?
C₈H₁₄
C₈H₂₀
C₈H₁₆
C₈H₁₈
30s
In a fractionating column, where are the fractions with the lowest boiling points collected?
At the top of the column
In the middle of the column
Just above the furnace
At the bottom of the column
30s
As the carbon chain length of alkanes increases, which change happens?
Flammability increases
They become more volatile
Viscosity increases
Boiling point decreases
30s
Which crude oil fraction is used as fuel for jet aircraft?
Heavy fuel oil
Bitumen
Kerosene
Liquefied petroleum gas
20s
Bromine water is shaken with an alkene. What colour change is seen?
Colourless to orange
Orange to green
It stays orange
Orange to colourless
20s
Decane is cracked: C₁₀H₂₂ → C₈H₁₈ + X. What is product X?
C₃H₆
C₂H₄
C₂H₂
C₂H₆
30s
Why do alkanes with longer chains have higher boiling points?
Stronger intermolecular forces between molecules
More ions are present in the liquid
More double bonds in each molecule
Stronger covalent bonds within molecules
30s