Cracking fractions of crude oil | Exit Quiz | Oak National Academy

Which of the following fractions are commonly used as fuels for cars?

• petrol

• bitumen

• liquified petroleum gas

• diesel

• kerosene

Answer explanation

Petrol and diesel are commonly used as fuels in cars.

What is the name of the thermal decomposition reaction where larger alkanes are broken down into smaller alkanes and alkenes?

Answer explanation

Cracking is the name of the thermal decomposition reaction where larger alkanes are broken down into smaller alkanes and alkenes.

Which of the following is an example of a hydrocarbon that can be cracked?

• methane

• ethene

• propene

• butane

Answer explanation

Butane is an alkane and an example of a hydrocarbon that can be cracked.

Which process involves heating larger alkanes to vapourise them, mixing with steam and heating to high temperatures to break down the hydrocarbon molecules?

• cracking

• neutralisation

• simple distillation

• fractional distillation

Answer explanation

Steam cracking involves heating larger alkanes to vapourise them, mixing with steam and heating to high temperatures to break down the hydrocarbon molecules into more useful smaller alkanes and alkenes.

Tags

NGSS.HS-PS1-5

Which of the following statements about alkenes is false?

• They have a double bond between carbon atoms.

• They are unsaturated hydrocarbons.

• They react with bromine water.

• Bromine water remains an orange/brown colour when an alkene is added.

Answer explanation

Bromine water does not remain an orange/brown colour with alkenes but turns colourless.

Which statement best describes why different fractions of crude oil have different properties and uses?

• They have the same boiling points but different densities.

• They have different boiling points, viscosities, and flammabilities.

• They have the same chemical structure but different colours.

• They have the same boiling point.

Answer explanation

Different fractions of crude oil have different properties and uses as they have different boiling points, viscosities, and flammabilities.