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Worksheet: Cracking of Hydrocarbons

Q1:

In which of the following properties is an increase observed when hydrocarbon fuels undergo cracking?

  • AMelting point
  • BMolecular size
  • CViscosity
  • DVolatility
  • EIgnition temperature

Q2:

Which type of chemical reaction is cracking an example of?

  • AAddition
  • BHydrolysis
  • CCondensation
  • DDecomposition
  • EDisplacement

Q3:

In catalytic cracking, a gaseous hydrocarbon flows over a heated catalyst and is converted to more valuable products. Which of the following catalyst properties cannot be increased to produce a higher reaction rate?

  • A Surface area
  • B Porosity
  • C Mass
  • D Particle size
  • E Temperature

Q4:

The cracking of a nonane molecule can produce a range of products.

If the cracking of a nonane molecule produces two molecules including propene, what is the name of the second product?

  • AHexene
  • BPentane
  • CPentene
  • DHexane
  • EHeptene

Which of the following pairs of molecules can be produced by the cracking of a nonane molecule, assuming there are no other products?

  • AButane + pentene
  • BOctane + methane
  • CHexene + propene
  • DPropane + heptene
  • EEthene + hexene

Which of the following groups of molecules can be produced by the cracking of a nonane molecule, assuming there are no other products?

  • APropene + propene + propene
  • BEthene + ethane + pentane
  • CPropane + ethene + butene
  • DHexene + propane + ethene
  • EButene + propane + methane

Q5:

Cracking may be used to convert one fraction of crude oil to a mixture of hydrocarbons with the properties of a different fraction. Which of the following fuels can be replicated via the cracking of kerosene?

  • ADiesel oil and gasoline
  • BGasoline only
  • CLPG only
  • DGasoline and LPG
  • EDiesel oil, gasoline, and LPG

Q6:

Which of the following statements is true?

  • ACracking is a method of polymerization.
  • BCracking increases the chain length of the hydrocarbon.
  • CCracking is exothermic.
  • DCracking is possible without a catalyst.
  • ECracking always generates gaseous products.

Q7:

In which range of temperatures is catalytic cracking usually performed?

  • A 1 0 0 3 0 0 C
  • B 0 1 0 0 C
  • C 3 0 0 5 0 0 C
  • D 5 0 0 7 0 0 C
  • E 7 0 0 9 0 0 C