AQA GCSE CHEMISTRY REVISION- C1.4 CRUDE OIL AND
FUELS QUESTIONS WITH CORRECT ANSWERS 2025
HydrocarbonB-BCORRECTBANSWERB-ABcompoundBcontainingBonlyBhydrogenBandBcarbon
AlkaneB-BCORRECTBANSWERB-ABsaturatedBhydrocarbon.
SaturatedBHydrocarbonB-BCORRECTBANSWERB-ThereBisBaBsingleBcarbon-
carbonBbondBandBnoBmoreBhydrogenBatomsBcanBbeBadded.
WhereBdidBcrudeBoilBcomeBfrom?B-BCORRECTBANSWERB-
AnimalsBandBplantsBsinkBtoBtheBbottomBofBtheBseaBwhenBtheyBdie,BbutBdoBnotBdecayBasBtheirBisBnoBoxygenBf
orBtheBbacteriaBtoBfeedBon.BTheyBareBkeptBunderBhighBpressureBandBhighBtemperaturesBsoBbecomeBcrudeBo
il.BThisBprocessBtakesBmillionsBofByears.
ExplainBFractionalBDistillationB-BCORRECTBANSWERB-
HotBcrudeBoilBvapourBisBpumpedBintoBtheBbottomB(theBhottestBpart)BofBtheBfractionatingBcolumn.BAsBcrudeB
oilBisBaBmixtureBofBhydrocarbons,BasBtheBvapourBrises,BandBtheBtemperatureBdecreasesBdifferentBhydrocarb
onsBwithBhigh-lowBboilingBpointsBcondenseBandBareBpumpedBoutBofBtheBcolumn.
PropertiesBofBHydrocarbonsB-BCORRECTBANSWERB-LongBchainBhave:
highBboilingBpoints
lowBflammability
highBviscoity
lowBvolatillity
aBsmokyBflame
ShortBchainBhave:
lowBboilingBpoints
highBflammability
lowBviscosity
highBvolatillity
FUELS QUESTIONS WITH CORRECT ANSWERS 2025
HydrocarbonB-BCORRECTBANSWERB-ABcompoundBcontainingBonlyBhydrogenBandBcarbon
AlkaneB-BCORRECTBANSWERB-ABsaturatedBhydrocarbon.
SaturatedBHydrocarbonB-BCORRECTBANSWERB-ThereBisBaBsingleBcarbon-
carbonBbondBandBnoBmoreBhydrogenBatomsBcanBbeBadded.
WhereBdidBcrudeBoilBcomeBfrom?B-BCORRECTBANSWERB-
AnimalsBandBplantsBsinkBtoBtheBbottomBofBtheBseaBwhenBtheyBdie,BbutBdoBnotBdecayBasBtheirBisBnoBoxygenBf
orBtheBbacteriaBtoBfeedBon.BTheyBareBkeptBunderBhighBpressureBandBhighBtemperaturesBsoBbecomeBcrudeBo
il.BThisBprocessBtakesBmillionsBofByears.
ExplainBFractionalBDistillationB-BCORRECTBANSWERB-
HotBcrudeBoilBvapourBisBpumpedBintoBtheBbottomB(theBhottestBpart)BofBtheBfractionatingBcolumn.BAsBcrudeB
oilBisBaBmixtureBofBhydrocarbons,BasBtheBvapourBrises,BandBtheBtemperatureBdecreasesBdifferentBhydrocarb
onsBwithBhigh-lowBboilingBpointsBcondenseBandBareBpumpedBoutBofBtheBcolumn.
PropertiesBofBHydrocarbonsB-BCORRECTBANSWERB-LongBchainBhave:
highBboilingBpoints
lowBflammability
highBviscoity
lowBvolatillity
aBsmokyBflame
ShortBchainBhave:
lowBboilingBpoints
highBflammability
lowBviscosity
highBvolatillity