Lesson Worksheet: Fractional Distillation of Crude Oil Chemistry

In this worksheet, we will practice describing the use of fractional distillation in separating crude oil and identifying the properties and uses of key fractions.

Q1:

In which of the following are crude oil fractions arranged in order of increasing viscosity?

  • AGasoline < kerosene < diesel oil
  • BKerosene < gasoline < diesel oil
  • CDiesel oil < gasoline < kerosene
  • DKerosene < diesel oil < gasoline
  • EGasoline < diesel oil < kerosene

Q2:

Which of the following is the molecular formula of a hydrocarbon likely to be found in LPG?

  • ACH614
  • BCH1226
  • CCH70142
  • DCH2450
  • ECH410

Q3:

Which of the following is the molecular formula of a hydrocarbon likely to be found in gasoline?

  • ACH2450
  • BCH60122
  • CCH1634
  • DCH818
  • ECH38

Q4:

Which of the following statements is false?

  • ALubricating oils ignite more easily than diesel oil.
  • BLPG contains shorter hydrocarbon molecules than diesel oil.
  • CKerosene is distilled at a lower temperature than diesel oil.
  • DHeavy fuel oils have higher viscosities than diesel oil.
  • EGasoline has a lower boiling point than diesel oil.

Q5:

Crude oil fractions collected at lower temperatures during fractional distillation exhibit higher values for which of the following physical properties?

  • AMolecular size
  • BVolatility
  • CViscosity
  • DMelting point
  • EIgnition temperature

Q6:

Selected melting and boiling points of compounds extracted from three crude oil fractions are shown in the table.

CompoundMelting Point (C)Boiling Point (C)
X13040
Y48391
Z1401

In which fraction of crude oil would compound X be found?

  • ADiesel oil
  • BLPG
  • CGasoline
  • DBitumen
  • EHeavy fuel oil

In which fraction of crude oil would compound Y be found?

  • ADiesel oil
  • BGasoline
  • CBitumen
  • DHeavy fuel oil
  • ELPG

In which fraction of crude oil would compound Z be found?

  • ALPG
  • BBitumen
  • CHeavy fuel oil
  • DGasoline
  • EDiesel oil

Q7:

Why are crude oil fractions described as non-renewable resources?

  • ACrude oil use is not sustainable because it is no longer naturally produced.
  • BCrude oil use is not sustainable because its production is very slow.
  • CProducts made from crude oil fractions are non-recyclable.
  • DCrude oil fractions cannot be reused after combustion.
  • EProducts made from crude oil fractions are non-biodegradable.

Q8:

In which application is kerosene used as the primary fuel?

  • APower stations
  • BAircraft
  • CDomestic heating
  • DTrains
  • ECars

Q9:

Which of the following statements is true?

  • AAll fractions of crude oil are used as fuels.
  • BMost fractions of crude oil are liquids at room temperature.
  • CFractional distillation involves a chemical reaction.
  • DFractional distillation involves the separation of crude oil into pure compounds.
  • EFractional distillation involves the separation of compounds using a pressure gradient.

Q10:

Which variable physical property of crude oil fractions enables their separation by fractional distillation?

  • ASolubility
  • BMelting point
  • CBoiling point
  • DFlammability
  • EViscosity

This lesson includes 13 additional questions and 3 additional question variations for subscribers.

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