| A | B |
|---|
| crude oil - wide boiling range | mixture |
| contain hydrogen and carbon only | hydrocarbon |
| hydrocarbon long chains have ... | high boiling point |
| hydrocarbon short chains have.. | low boiling point |
| viscosity - long chains | very viscous |
| viscosity short chains | low viscosity |
| fractionating column - top | short chains |
| fractionating column - bottom | long chains |
| fuel gas molecules have ... | 1-4 carbons |
| bitumen chain length is... | very long |
| bitumen used for... | road surfacing |
| kerosene fraction used for ... | aviation fuel |
| fractionnation possible because hydrocarbons have.... | different boiling points |
| the longer the chain length .. | the higher the boiling point |
| the shorter the chain length.... | the lower the boiling point |
| the lower the boiling point | the shorter the chain length |
| the higher the boiling point | the longer the chain length |
| burning time for short chains is ... | short |
| burning time for long chains is .. | long |
| short chains catch fire | quickly |
| long chains catch fire | less quickly |
| short chains evaporation rate is ... | high |
| long chains evaporation rate is... | low |
| diesel evaporates more slowly than petrol because ...... | its chains are longer |
| a fraction is a mixture because... | it boils over a range of temperature |
| in fractionnation the crude oil is vapourised and then | allowed to cool down |
| the gasoline fraction is used for.. | car fuel |
| not enough gasoline to meet world demand so ... | need to crack fractions in lower demand |
