Cracking

What is cracking?

• A process that turns long chain hydrocarbons into short chain hydrocarbons

• A process that turns short chain hydrocarbons into long chain hydrocarbons

Why do we use cracking to get petrol?

• The supply of petrol from cracking is larger than the demand

• The supply of petrol from fractional distillation is larger than the demand

• The supply of petrol from fractional distillation is smaller than the demand

• The supply of petrol from cracking is smaller than the demand

Which is NOT a property of a long chain hydrocarbon?

• Viscous

• Flammable

• Not very volatile

• High boiling point

What is always produce during cracking?

• Alkane + alkane

• Alkane + alkene

• Alkene + alkene

Decane (10 carbons) is cracked into hexane (6 carbons) and an alkene. What is the name of this alkene?

• Ethene

• Propene

• Butene

• Pentene

What type of reaction is cracking?

• Addition

• Displacement

• Thermal decomposition

• Neutralisation

What is the test for alkenes?

• Adding bromine water, if alkene is present it will turn orange

• Adding bromine water, if alkene is present it will turn colourless

• Adding bromine water, if alkane is present it will turn orange

• Adding bromine water, if alkane is present it will turn colourless

Fractional distillation is a separation technique. It is best described as which one of the following?

• A physical change

• A chemical change

Cracking is defined as which one of the following?

• The thermal decomposition of alkAnes.

• The thermal decomposition of alkEnes.

• The separation of a mixture of alkAnes.

• The separation of a mixture of alkEnes.

In the fractional distillation of petroleum (crude oil), the term fraction refers to what?

• A group of compounds with a similar number of carbon atoms.

• A group of compounds with similar boiling points.

• A group of compounds with similar uses.

• A group of compounds with similar molecular masses.