Hydrocarbons and crude oil

What term is given to a compound which contains atoms of carbon and hydrogen only?

• alkene

• hydrocarbon

• alkane

• saturated

Alkenes have the general formula:

• CnH2n

• CnH2n+1

• CnH2n+2

• CnHn

What term describes alkene molecules that contain a C=C double bond?

• saturated

• unsaturated

Alkanes have the general formula:

• CnH2n

• CnH2n+1

• CnH2n+2

• CnHn

What term describes alkane molecules that contain C-C single bonds?

• saturated

• unsaturated

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