Fractional Distillation & Cracking Process

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

Name the following hydrocarbon

• butane

• hexane

• heptane

• hexene

When testing for alkenes (unsaturation) bromine water turns from...

• orange --> blue/black

• colourless --> pink

• orange --> colourless

• orange --> clear

Which key term is described as the attractive force BETWEEN molecules?

• a) Inner molecular forces
• b) Outer molecular forces
• c) Intermolecular forces
• d) Intramolecular forces

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

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

• At the top

• At the bottom