Cracking and Alkenes

What is crude oil primarily composed of?

• A single type of hydrocarbon

• Water and hydrocarbons

• A mixture of lots of different hydrocarbons

• Minerals and gases

What process is used to separate different hydrocarbons in crude oil?

• Condensation

• Filtration

• Evaporation

• Fractional distillation

Which hydrocarbons are the most flammable?

• Medium-length hydrocarbons

• Shortest hydrocarbons

• All hydrocarbons equally

• Longest hydrocarbons

What is the process called that breaks down longer hydrocarbons into shorter ones?

• Condensation

• Filtration

• Evaporation

• Cracking

What does 'thermal decomposition' mean?

• Combining molecules by heating them

• Combining molecules by cooling them

• Breaking down molecules by heating them

• Breaking down molecules by cooling them

What is used as a catalyst in catalytic cracking?

• Hot water

• Hot powdered aluminium oxide

• Cold powdered aluminium oxide

• Steam

What happens to long hydrocarbons during steam cracking?

• They split apart into shorter hydrocarbons

• They dissolve in steam

• They combine into even longer hydrocarbons

• They remain unchanged

What must be true for a balanced chemical equation?

• The number of molecules must be the same on each side

• The number of carbons and hydrogens on each side must be the same

• The equation must only include liquids

• The equation must start with a hydrocarbon

What is the structural difference between alkanes and alkenes?

• Alkanes have a single bond, while alkenes have a double bond

• Alkanes have a double bond, while alkenes have a single bond

• Alkanes have a triple bond, while alkenes have a double bond

• There is no structural difference

What happens when bromine water is added to alkenes?

• It turns from orange to colorless

• Nothing happens

• It explodes

• It turns from colorless to orange