AQA GCSE CHEMISTRY PAPER 1 QUESTIONS WITH CORRECT ANSWERS 2025

AQA GCSE CHEMISTRY PAPER 1 QUESTIONS
WITH CORRECT ANSWERS 2025
WhatBisBanB*atom*?B-BCORRECTBANSWERB-smallestBpartBofBanBelement



WhatBisBanB*element*?B-BCORRECTBANSWERB-aBsubstanceBthatBcontainsBonlyBoneBtypeBofBatom



WhatBareB*chemicalBsymbols*?B-BCORRECTBANSWERB--
BtheBletterBorBpairBofBlettersBthatBrepresentsBanBelement.



-BfirstBletterBisBalwaysBcapitalized



WhatBareB*compounds*?B-BCORRECTBANSWERB-
substancesBinBwhichBatomsBofBtwoBorBmoreBelements,BwhichBareBchemicallyBcombined



WhatBisBaB*chemicalBformula*?B-BCORRECTBANSWERB-
aBcombinationBofBsymbolsBthatBshowsBtheBratioBofBelementsBinBaBcompound



WhyBareB*chemicalBformula*Bused?B-BCORRECTBANSWERB--BtheBdifferentBelementsBinBaBcompound

-BhowBmanyBatomsBofBeachBelementBoneBmoleculeBofBtheBcompoundBcontain



HowBcanB*compounds*BbeBseparated?B-BCORRECTBANSWERB-ThroughBchemicalBreactions



WhatBareB*reactants*?B-BCORRECTBANSWERB-theBstartingBmaterialsBinBaBchemicalBreactionB(onBtheBleft)



WhatBareB*products*?B-BCORRECTBANSWERB-theBendingBmaterialsBinBaBchemicalBreactionB(onBtheBright)



WhatBisBalwaysB*equal*BtoBeachBotherBinBaB*chemicalBreaction*?B-BCORRECTBANSWERB-
productsBtoBreactants

-BnoBatomsBareBlostBorBmade

,WhatBisBaB*mixture*?B-BCORRECTBANSWERB-
consistBofBtwoBorBmoreBelementsBorBcompoundsBwhichBareBnotBchemicallyBcombined



WhatBareBtheB*properties*BofB*mixtures*?B-BCORRECTBANSWERB-
theyBretainBtheirBownBpropertiesBfromBbefore

e.g.Bcolour



HowBcanB*mixtures*BbeBseparated?B-BCORRECTBANSWERB-byBphysicalBprocessesB-
BnoBnewBsubstancesBareBmade




WhatBisB*filtration*?B-BCORRECTBANSWERB--BusedBtoBseparateBsolubleBsolidsBfromBinsolubleBsolids



WhatBisB*crystallisation*?B-BCORRECTBANSWERB--BusedBtoBobtainBaBsolubleBsolidBfromBaBsolution

1.BMixtureBisBgentlyBwarmed

2.BWaterBevaporatesBleavingBcrystalsBofBpureBsalt



WhatBisB*simpleBdistillation*?B-BCORRECTBANSWERB-usedBtoBobtainBaBsolventBfromBaBsolution



*RP*BAnalysisBandBpurificationBofBwaterBsamplesBfromBdifferentBsourcesB-BCORRECTBANSWERB-
1.BUseBaBpHBprobeBorBindicatorBtoBanalyseBtheBpHBofBtheBsample

2.BSetBupBtheBequipment

3.BHeatBaBsetBvolumeBtoB100oCBsoBthatBtheBwaterBchangesBfromBliquidBtoBgas

4.BWaterBcollectsBinBtheBcondenserBandBchangesBstateBfromBgasBtoBliquid

5.BmeasureBtheBmassBofBsolidBthatBremainsBtoBfindBtheBamountBofBdissolvedBsolidsBpresentBinBtheBsample



WhatBisB*fractionalBdistillation*?B-BCORRECTBANSWERB--
BusedBtoBseparateBmixturesBinBwhichBtheBcomponentsBhaveBdifferentBboilingBpoints




WhatBisB*chromatography*?B-BCORRECTBANSWERB-
usedBtoBseparateBtheBdifferentBsoluble,BcolouredBcomponentsBofBaBmixture

,WhatBwereB*atoms*BthoughtBtoBbeBinB*earlyBmodels*?B-BCORRECTBANSWERB-
TinyBspheresBthatBcouldBnotBbeBdividedBintoBsimplerBparticles



WhatBdidB*Thomson*BdiscoverBinB1898?B-BCORRECTBANSWERB-electronsB-
BcausingBtheBrepresentativeBofBatomsBtoBbeBchanged




WhatBmodelBdidB*Thomson*BmakeB?B-BCORRECTBANSWERB-plumBpuddingBmodel



WhatBwasBtheB*plumBpudding*BmodelBmadeBupBof?B-BCORRECTBANSWERB--
BatomBcontainedBtiny,BnegativeBelectrons



-BsurroundedBbyBaBpositiveBcharge



WhatBdidB*GeigerBandBMarsden*Bdo?B-BCORRECTBANSWERB-
measuredBtheBdeflectionBofBalphaBparticlesBbombardingBgoldBfoil



WhatBdidB*GeigerBandBMarsden*BconcludeBaboutBtheirBexperiment?B-BCORRECTBANSWERB--
BsomeBalphaBparticlesBdeflected



-BsomeBwentBstraightBthrough



WhatBdidB*Rutherford*BconcludeBaboutBtheB*alphaBandBgoldBfoil*Bexperiment?B-BCORRECTBANSWERB--
BthereBmustBbeBaBpositiveBchargeBinBtheBcenterBofBeachBatomB(newBmodelBnowBcalledB'nuclear')




WhatBdidB*Bohr*Bdo?B-BCORRECTBANSWERB-
saidBthatBelectronsBwereBarrangedBinBlevelsBorBorbitsBaroundBtheBnucleus



WhatBdidB*JamesBChadwick*Bdiscover?B-BCORRECTBANSWERB-neutronsBinBtheBnucleus



HowBbigBareB*atoms*?B-BCORRECTBANSWERB--BveryBsmall

-B0.1nmBorB1BxB10^-10m



WhatBdoBallB*atoms*Bcontain?B-BCORRECTBANSWERB-protons,Bneutrons,Belectrons

, WhatBisBtheB*relativeBcharge*BandB*mass*BofBaB*proton*?B-BCORRECTBANSWERB-1

+1



WhatBisBtheB*relativeBcharge*BandB*mass*BofBaB*nucleus*?B-BCORRECTBANSWERB-1

0



WhatBisBtheB*relativeBcharge*BandB*mass*BofBanB*electron*?B-BCORRECTBANSWERB-veryBsmall

-1



WhereBisBmostBofBtheB*mass*BofBanB*atom*?B-BCORRECTBANSWERB-nucleus



HowBmuchB*smaller*BisBtheBradiusBofBtheB*nucleus*BcomparedBtoBtheBrestBofBtheBatom?B-
BCORRECTBANSWERB-1/10000




WhyBdoB*atoms*BhaveBnoB*overallBcharge*?B-BCORRECTBANSWERB-
theyBcontainBanBequalBnumberBofBprotonsBandBelectrons



WhatBdoBallBatomsBofBaBparticularB*element*BhaveBinBcommon?B-BCORRECTBANSWERB--
BtheyBhaveBtheBsameBnumberBofBprotons




WhatBisBtheB*atomicBnumber*?B-BCORRECTBANSWERB-numberBofBprotons



WhatBisBtheB*massBnumber*?B-BCORRECTBANSWERB-NumberBofBprotonsBandBneutrons



WhatBareB*isotopes*?B-BCORRECTBANSWERB-
AtomsBofBtheBsameBelementBwithBdifferentBnumbersBofBneutrons



HowBcanB*atoms*BbecomeB*ionic*?B-BCORRECTBANSWERB--BbyBlosingBorBgainingBelectrons