Crude oil, pollution and cracking

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

• distillation

• fractional distillation

• cracking

• polymerisation

Where in the fractionating column are shorter chain hydrocarbon molecules obtained?

• At the top

• At the bottom

Fractional distillation separates crude oil based on the different __________ of the molecules in the mixture

• melting point

• boiling point

• freezing point

• chemical reactivity

Molecules collected at the bottom of the fractionating column tend to be...

• more viscous, less flammable and less volatile

• less viscous, more flammable and more volatile

• more viscous, more flammable and less volatile

• less viscous, less flammable and more volatile

Molecules collected at the top of the fractionating column tend to be...

• more viscous, less flammable and less volatile

• less viscous, more flammable and more volatile

• more viscous, more flammable and less volatile

• less viscous, less flammable and more volatile

What are the 2 products of complete combustion?

• carbon dioxide + hydrogen

• carbon dioxide + water

• carbon monoxide + water

• carbon monoxide + hydrogen

What are the products of incomplete combustion?

• carbon monoxide

• water

• carbon

• hydrogen

What does a fuel react with when it burns?

• oxygen

• water

• carbon dioxide

• methane

What is the term given to the process by which longer chain hydrocarbons are broken down into shorter length alkanes and alkenes?

• fractional distillation

• evaporation

• cracking

• polymerisation

What conditions are needed for cracking?

• high temperature

• high pressure

• catalyst

• low temperature

Tags

NGSS.HS-PS1-5