Pleasewriteclearlyinblockvcapitals.
Centrenumber Candidatenumber
Surname v
Forename(s) v
Candidatesignature
GCSE
COMBINEDSCIENCE:TRILOGY
FoundationvTierChemistry
F
vPaper1F
Monday19May2025 Morning Timeallowed:1hour15minutes
b
Materials For Examiner’s Use
b b
Forthispapervyoumusthave:
Question Mark
aruler
ascientific calculator
b
1
theperiodictable (enclosed).
b
2
3
Instructions
Useblackinkvorvblackball-pointvpen. 4
b b b b
Pencilshouldonlybe usedforv drawing.
b 5
Fillvintheboxesat thetopofvthis page.
b b
6
Answervallvquestionsinthespaces provided. b
Ifvyouneedextraspaceforvyourvanswer(s),vusethelinedpagesvatvtheendofvthisvb
b b
7
ook.vWritethequestionvnumbervagainstvyourvanswer(s). TOTAL
Dovallvroughwork inthisbook.vCrossthroughanyvworkvyoudonot want tobevmark
b b b
evd.
Inallcalculations,v showclearlyhowyouworkout yourv answer. b
Information
Themaximummarkforthis paperv is70. b
Themarksforvquestionsarevshowninbrackets.
Youareexpectedtouseavcalculatorvwhereappropriate.
Youareremindedof vthe needforgoodEnglishandclearvpresentationinyour vanswers.
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IB/M/Jun25/G4007/E9 8464/C/1F
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v outsideth
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0 1 Thisquestionisaboutatomsandions. e
Themodelof vtheatomvhaschangedovervtime
.
0 1 . 1 Inanearlymodel,vscientiststhought theatomvwasatinyspherethat couldvnot
b b
bevdivided.
Figure 1representsthisearlymodelofv theatom.
b
Figurev1
Thediscoveryofva subatomic particlevledtoachange inthemodelinFigure 1.
b b b b
Whichwasthefirstvsubatomicvparticletobediscovered?vTi
[1mark]
cvk () onevbox.
b b
Electron
Neutron
vProton
IB/M/Jun25/8464/C/1F
, 3
Do notwrite
b b
v outsideth
box
0 1 . 2 e
Inalatervmodelofvtheatom,vmost ofvthemassvwas concentratedint
b b
hevcentrvevofvthevatom.
What is thename ofvthecentre ofvanvatom?
b b b b [1mark]
0 1 . 3 Atomscontainthreetypes ofvsubatomicvparticle.
b
Drawonevlinefromveachsubatomic particle totherelativechargeofvtheparticle.
b b
[2marks]
0 1 . 4 What is meantbythe ‘atomic numberofvanatom’?vTick (
b b b b b
[1mark]
) onevbox.
b
Thenumbervofvneutronsonly
Thenumbervofvprotonsonly
Thenumbervofvneutronsv +v thenumberofvprotons
Question1continuesonvthenext page b
Turnover►
IB/M/Jun25/8464/C/1F
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v outsideth
box
0 1 . 5 Table 1showsvinformationvaboutvtwoisotopesofanelement.
b e
Table 1 b
Percentage(%)va
Mass number
bundance
b
IsotopevA 10 19.7
IsotopevB 11 80.3
Calculatetherelativeatomicmass(Ar) oftheelement.vUsevth
b
v evequation:
(mass number×percentage)ofvisotopevA+(massnumber×percentage)of visotopeB
b
Arv
= 100
Giveyourvanswerto1decimalplace.
[3marks]
Arv (1vdecimalvplace) =v
b
IB/M/Jun25/8464/C/1F
Centrenumber Candidatenumber
Surname v
Forename(s) v
Candidatesignature
GCSE
COMBINEDSCIENCE:TRILOGY
FoundationvTierChemistry
F
vPaper1F
Monday19May2025 Morning Timeallowed:1hour15minutes
b
Materials For Examiner’s Use
b b
Forthispapervyoumusthave:
Question Mark
aruler
ascientific calculator
b
1
theperiodictable (enclosed).
b
2
3
Instructions
Useblackinkvorvblackball-pointvpen. 4
b b b b
Pencilshouldonlybe usedforv drawing.
b 5
Fillvintheboxesat thetopofvthis page.
b b
6
Answervallvquestionsinthespaces provided. b
Ifvyouneedextraspaceforvyourvanswer(s),vusethelinedpagesvatvtheendofvthisvb
b b
7
ook.vWritethequestionvnumbervagainstvyourvanswer(s). TOTAL
Dovallvroughwork inthisbook.vCrossthroughanyvworkvyoudonot want tobevmark
b b b
evd.
Inallcalculations,v showclearlyhowyouworkout yourv answer. b
Information
Themaximummarkforthis paperv is70. b
Themarksforvquestionsarevshowninbrackets.
Youareexpectedtouseavcalculatorvwhereappropriate.
Youareremindedof vthe needforgoodEnglishandclearvpresentationinyour vanswers.
b
IB/M/Jun25/G4007/E9 8464/C/1F
, 2
Do notwrite
b b
v outsideth
box
0 1 Thisquestionisaboutatomsandions. e
Themodelof vtheatomvhaschangedovervtime
.
0 1 . 1 Inanearlymodel,vscientiststhought theatomvwasatinyspherethat couldvnot
b b
bevdivided.
Figure 1representsthisearlymodelofv theatom.
b
Figurev1
Thediscoveryofva subatomic particlevledtoachange inthemodelinFigure 1.
b b b b
Whichwasthefirstvsubatomicvparticletobediscovered?vTi
[1mark]
cvk () onevbox.
b b
Electron
Neutron
vProton
IB/M/Jun25/8464/C/1F
, 3
Do notwrite
b b
v outsideth
box
0 1 . 2 e
Inalatervmodelofvtheatom,vmost ofvthemassvwas concentratedint
b b
hevcentrvevofvthevatom.
What is thename ofvthecentre ofvanvatom?
b b b b [1mark]
0 1 . 3 Atomscontainthreetypes ofvsubatomicvparticle.
b
Drawonevlinefromveachsubatomic particle totherelativechargeofvtheparticle.
b b
[2marks]
0 1 . 4 What is meantbythe ‘atomic numberofvanatom’?vTick (
b b b b b
[1mark]
) onevbox.
b
Thenumbervofvneutronsonly
Thenumbervofvprotonsonly
Thenumbervofvneutronsv +v thenumberofvprotons
Question1continuesonvthenext page b
Turnover►
IB/M/Jun25/8464/C/1F
, 4
Do notwrite
b b
v outsideth
box
0 1 . 5 Table 1showsvinformationvaboutvtwoisotopesofanelement.
b e
Table 1 b
Percentage(%)va
Mass number
bundance
b
IsotopevA 10 19.7
IsotopevB 11 80.3
Calculatetherelativeatomicmass(Ar) oftheelement.vUsevth
b
v evequation:
(mass number×percentage)ofvisotopevA+(massnumber×percentage)of visotopeB
b
Arv
= 100
Giveyourvanswerto1decimalplace.
[3marks]
Arv (1vdecimalvplace) =v
b
IB/M/Jun25/8464/C/1F
