Hydrocarbons Revision

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

• alkene

• hydrocarbon

• alkane

• saturated

Alkenes have the general formula:

• C_nH_2n

• C_nH_2n+1

• C_nH_2n+2

• C_nH_n

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

• saturated

• unsaturated

Alkanes have the general formula:

• C_nH_2n

• C_nH_2n+1

• C_nH_2n+2

• C_nH_n

What term describes molecules that contain only 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 fractional distillation 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 column in fractional distillation tend to be...

• more viscous, less flammable and darker in colour

• less viscous, more flammable and lighter in colour

• more viscous, more flammable and darker in colour

• less viscous, less flammable and lighter in colour

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

• more viscous, less flammable and darker in colour

• less viscous, more flammable and lighter in colour

• more viscous, more flammable and darker in colour

• less viscous, less flammable and lighter in colour