AQA GCSE CHEMISTRY ORGANIC CHEMISTRY QUESTIONS WITH CORRECT ANSWERS 2025

AQA GCSE CHEMISTRY: ORGANIC CHEMISTRY
QUESTIONS WITH CORRECT ANSWERS 2025
WhyNisNcrudeNoilNaNfiniteNresource?N-NCORRECTNANSWERN--NitNwillNeventuallyNrunNout



WhatNisNcrudeNoilNtheNremainsNof?N-NCORRECTNANSWERN--
NcrudeNoilNisNtheNremainsNofNanNancientNbiomassNconsistingNmainlyNofNplanktonNthatNwasNburiedNinNmud




WhatNisNcrudeNoilNaNmixtureNof?N-NCORRECTNANSWERN--
NcrudeNoilNisNaNmixtureNofNaNveryNlargeNnumberNofNcompounds



-NmostNofNtheNcompoundsNinNcrudeNoilNareNhydrocarbons



WhatNareNhydrocarbons?N-NCORRECTNANSWERN--
NmoleculesNthatNareNmadeNupNofNhydrogenNandNcarbonNatomsNonly




WhatNareNmostNofNtheNhydrocarbonsNinNcrudeNoil?N-NCORRECTNANSWERN-alkanes



WhatNisNtheNgeneralNformulaNforNtheNhomologousNseriesNofNalkanes?N-NCORRECTNANSWERN-CₙH₂ₙ₊₂



HowNareNsingleNcovalentNbondsNshownNinNchemicalNformulas?N-NCORRECTNANSWERN-
aNsingleNlineNjoiningNtwoNatoms



WhatNisNtheNstructureNandNformulaNofNmethane?N-NCORRECTNANSWERN-CH₄



WhatNisNtheNstructureNandNformulaNofNethane?N-NCORRECTNANSWERN-C₂H₆



WhatNisNtheNstructureNandNformulaNofNpropane?N-NCORRECTNANSWERN-C₃H₈



WhatNisNtheNstructureNandNformulaNofNbutane?N-NCORRECTNANSWERN-C₄H₁₀

, WhatNdoesNitNmeanNifNalkanesNareNsaturatedNmolecules?N-NCORRECTNANSWERN--
NtheNcarbonNatomsNareNfullyNbondedNtoNhydrogenNatoms



-NallNofNtheNbondsNareNsingle



WhatNdoesNviscosityNmean?N-NCORRECTNANSWERN-thicknessNofNaNfluidN(e.g.NhoneyNisNveryNviscous)

-NfluidsNwithNaNhighNviscosityNflowNslowly



HowNdoesNtheNsizeNofNtheNhydrocarbonNmoleculesNaffectNtheirNviscosity?N-NCORRECTNANSWERN--
NasNtheNsizeNofNtheNhydrocarbonNmoleculesNinceases,NtheNmoleculesNgetNmoreNviscous




WhatNdoesNflammabilityNmean?N-NCORRECTNANSWERN-howNeasilyNaNhydrocarbonNcombustsN(burns)



HowNdoesNtheNsizeNofNtheNhydrocarbonNmoleculesNaffectNtheirNflammability?N-NCORRECTNANSWERN--
NshortNchainNhydrocarbonsNareNextremelyNflammable



-NincreasingNtheNsizeNofNtheNhydrocarbonNmoleculeNdecreasesNitsNflammabilityN(theyNgetNharderNtoNburn)



HowNdoesNtheNsizeNofNtheNhydrocarbonNmoleculesNaffectNtheirNboilingNpoint?N-NCORRECTNANSWERN--
NshortNchainNhydrocarbonsNhaveNlowNboilingNpoints



-
NasNtheNsizeNofNtheNhydrocarbonNmoleculeNincreases,NtheirNboilngNpointsNgetNhigherN(theyNrequireNaNhighe

rNtemperatureNtoNbreakNtheNintermolecularNforces)



WhatNdoesNboilingNpointNmean?N-NCORRECTNANSWERN-theNtemperatureNatNwhichNaNliquidNturnsNtoNaNgas



WhyNareNhydrocarbonsNusedNasNfuels?N-NCORRECTNANSWERN--NtheyNreleaseNenergyNwhenNcombusted



WhatNhappensNduringNtheNcombustionNofNhydrocarbons?N-NCORRECTNANSWERN--
NduringNcombustion,NtheNcarbonNandNhydrogenNatomsNreactNwithNoxygenN(theNcarbonNandNhydrogenNareN

oxidised)



WhatNdoesNcompleteNcombustionNmean?N