CHMM Practice Exam Questions
and Answers Updated 2026
WhenApoloniumA(atomicAmassA210A&AatomicAnumberA84)AemitsAanAalphaAparticle,AwhichAo
fAtheAfollowingAdecayAproductsAresults?
a.ABismuthA(atomicAmassA209A&AatomicAnumberA83)
b.ALeadA(atomicAmassA206A&AatomicAnumberA82)
c.AThalliumA(atomicAmassA204A&AatomicAnumberA81)
d.AMercuryA(atomicAmassA201A&AatomicAnumberA80)A-
AAnswerAb.ALeadA(atomicAmassA206A&AatomicAnumberA82)
AtomicAMassAis:
a.AtheAnumberAofAprotonsAinAtheAnucleus
b.AtheAtotalAnumberAofAprotonsA&AneutronsAinAtheAnucleus
c.AaAnuclearAparticleAthatAhasAanAatomicAweightAofAoneAandAisAelectricallyAneutral
d.AaAparticleAthatAcontainsAallAtheApositiveAchargeAandAessentiallyAallAtheAweightAofAtheAat
omA-AAnswerAb.AtheAtotalAnumberAofAprotonsA&AneutronsAinAtheAnucleus
WhichAofAtheAfollowingAisAnotAaAchemicalAasphyxiant?
Aa.AcarbonAmonoxide
Ab.AcarbonAdioxide
Ac.AhydrogenAsulfide
Ad.AhydrogenAcyanideA-AAnswerAc.AhydrogenAsulfide
WhichAofAtheAfollowingAdisplacesAoxygenAbutAdoesAnotAactuallyAinterfereAwithA
theAhumanAbody'sAabilityAtoAuseAoxygen?
Aa.AcarbonAdioxide
Ab.Anitrogen
Ac.AnobleAgases
Ad.AallAofAtheAaboveA-AAnswerAd.AallAofAtheAabove
WhichAofAtheAfollowingAstatementsAregardingAoxidationAisAalwaysAcorrect?
,a.AoxygenAmustAbeAaAchemicalAreactantAforAanAoxidationAreactionAtoAoccurA
b.AoxidationAisAaAviolentAreactionAthatAalwaysAproducesAheatAandAlightA
c.AoxidationAalwaysAresultsAinAatAleastAoneAelectronAbeingAtransferredAfromAoneAatomAtoAa
notherA
d.AtheAvalenceAofAtheAatomAisAreducedAoccursAwhenAitAgivesAupAanAoxidationAelectronA-
AAnswerAc.AoxidationAalwaysAresultsAinAatAleastAoneAelectronAbeingAtransferredAfromAoneAa
tomAtoAanother
WhichAofAtheAfollowingAsevenAstepsAforApreparingAhazardousAmaterialsAforAtransportAisAinAt
heAcorrectAorder?
Aa.AproperAshippingAname,Aclassify,Apackage,Amark,Alabel,Apaperwork,Aplacard
Ab.Aclassify,AproperAshippingAname,Apackage,Amark,Alabel,Apaperwork,Aplacard
Ac.Apackage,Aclassify,AproperAshippingAname,Amark,Alabel,Apaperwork,Aplacard
Ad.Apackage,Amark,Alabel,Aclassify,AproperAshippingAname,Apaperwork,AplacardA-
AAnswerAb.Aclassify,AproperAshippingAname,Apackage,Amark,Alabel,Apaperwork,Aplacard
BoilingAPointAisAtheAtemperatureAatAwhich:
a.AtheAvaporApressureAofAaAsolidAjustAequalsAatmosphericApressureA
b.AtheAvaporApressureAofAaAliquidAisAgreaterAthanAatmosphericApressureA
c.AtheAvaporApressureAofAaAliquidAisAlessAthanAatmosphericApressureA
d.AtheAvaporApressureAofAaAliquidAjustAequalsAatmosphericApressureA-
AAnswerAd.AtheAvaporApressureAofAaAliquidAjustAequalsAatmosphericApressure
FlashApointAisAthe:
a.AmaximumAtemperatureAofAaAliquidAatAwhichAitAgiveAoffAvaporsAsufficientAtoAformAanAign
itableAmixtureAwithAair
b.AmaximumAtemperatureAofAaAliquidAatAwhichAitAgivesAoffAvaporsAsufficientAtoAformAanAig
nitableAmixtureAwithAwater
c.AminimumAtemperatureAofAaAliquidAatAwhichAitAgivesAoffAvaporsAsufficientAtoAformAanAig
nitableAmixtureAwithAair
d.AminimumAtemperatureAofAaAliquidAatAwhichAitAgivesAoffAvaporsAsufficientAtoAformAanAig
nitableAmixtureAwithAwaterA-
AAnswerAc.AminimumAtemperatureAofAaAliquidAatAwhichAitAgivesAoffAvaporsAsufficientAtoAfo
rmAanAignitableAmixtureAwithAair
, BLEVEAisAtheAacronymAfor:
a.ABoilingALiquidsAEvaporateAVeryAExpensivelyA
b.ABoilingALiquidsAErodeAVeryAEfficientlyA
c.ABoilingALiquidsAEndAVaporAExplosionsA
d.ABoilingALiquidAExpandingAVaporAExplosionA-
AAnswerAd.ABoilingALiquidAExpandingAVaporAExplosion
Cobalt-60AhasAaA5AyearAhalfAlife.AIfAtheAinitialAactivityAofAaACobalt-
60AsourceAisA20AmCi,AwhatAisAtheAactivityAafterA10AyearsAinAmCi?
a.A5A
b.A0A
c.A2A
d.A10A-AAnswerAa.A5
TheAexposureArateAatAaAdistanceAofA1AfootAfromAaAradioactiveAsourceAisA20ArnR/hr.AWhatA
isAtheAexposureArateAinAmR/hr.AatA10Afeet?
a.A0.1A
b.A0.2A
c.A0.3A
d.A0.4A-AAnswerAb.A0.2
WhichAofAtheAfollowingAisAnotAregulatedAbyAEPAAasAanAenvironmentallyAtoxicAmetal?A
a.AarsenicA
b.Alead
c.Acadmium
d.AironA-AAnswerAd.Airon
WhichAofAtheAfollowingAchemicalsAisAheavierAthanAair?
ChemicalANameAVaporADensity
a.AMethaneA0.55
b.ACarbonAMonoxideA0.97
c.ANitrogenA0.97
and Answers Updated 2026
WhenApoloniumA(atomicAmassA210A&AatomicAnumberA84)AemitsAanAalphaAparticle,AwhichAo
fAtheAfollowingAdecayAproductsAresults?
a.ABismuthA(atomicAmassA209A&AatomicAnumberA83)
b.ALeadA(atomicAmassA206A&AatomicAnumberA82)
c.AThalliumA(atomicAmassA204A&AatomicAnumberA81)
d.AMercuryA(atomicAmassA201A&AatomicAnumberA80)A-
AAnswerAb.ALeadA(atomicAmassA206A&AatomicAnumberA82)
AtomicAMassAis:
a.AtheAnumberAofAprotonsAinAtheAnucleus
b.AtheAtotalAnumberAofAprotonsA&AneutronsAinAtheAnucleus
c.AaAnuclearAparticleAthatAhasAanAatomicAweightAofAoneAandAisAelectricallyAneutral
d.AaAparticleAthatAcontainsAallAtheApositiveAchargeAandAessentiallyAallAtheAweightAofAtheAat
omA-AAnswerAb.AtheAtotalAnumberAofAprotonsA&AneutronsAinAtheAnucleus
WhichAofAtheAfollowingAisAnotAaAchemicalAasphyxiant?
Aa.AcarbonAmonoxide
Ab.AcarbonAdioxide
Ac.AhydrogenAsulfide
Ad.AhydrogenAcyanideA-AAnswerAc.AhydrogenAsulfide
WhichAofAtheAfollowingAdisplacesAoxygenAbutAdoesAnotAactuallyAinterfereAwithA
theAhumanAbody'sAabilityAtoAuseAoxygen?
Aa.AcarbonAdioxide
Ab.Anitrogen
Ac.AnobleAgases
Ad.AallAofAtheAaboveA-AAnswerAd.AallAofAtheAabove
WhichAofAtheAfollowingAstatementsAregardingAoxidationAisAalwaysAcorrect?
,a.AoxygenAmustAbeAaAchemicalAreactantAforAanAoxidationAreactionAtoAoccurA
b.AoxidationAisAaAviolentAreactionAthatAalwaysAproducesAheatAandAlightA
c.AoxidationAalwaysAresultsAinAatAleastAoneAelectronAbeingAtransferredAfromAoneAatomAtoAa
notherA
d.AtheAvalenceAofAtheAatomAisAreducedAoccursAwhenAitAgivesAupAanAoxidationAelectronA-
AAnswerAc.AoxidationAalwaysAresultsAinAatAleastAoneAelectronAbeingAtransferredAfromAoneAa
tomAtoAanother
WhichAofAtheAfollowingAsevenAstepsAforApreparingAhazardousAmaterialsAforAtransportAisAinAt
heAcorrectAorder?
Aa.AproperAshippingAname,Aclassify,Apackage,Amark,Alabel,Apaperwork,Aplacard
Ab.Aclassify,AproperAshippingAname,Apackage,Amark,Alabel,Apaperwork,Aplacard
Ac.Apackage,Aclassify,AproperAshippingAname,Amark,Alabel,Apaperwork,Aplacard
Ad.Apackage,Amark,Alabel,Aclassify,AproperAshippingAname,Apaperwork,AplacardA-
AAnswerAb.Aclassify,AproperAshippingAname,Apackage,Amark,Alabel,Apaperwork,Aplacard
BoilingAPointAisAtheAtemperatureAatAwhich:
a.AtheAvaporApressureAofAaAsolidAjustAequalsAatmosphericApressureA
b.AtheAvaporApressureAofAaAliquidAisAgreaterAthanAatmosphericApressureA
c.AtheAvaporApressureAofAaAliquidAisAlessAthanAatmosphericApressureA
d.AtheAvaporApressureAofAaAliquidAjustAequalsAatmosphericApressureA-
AAnswerAd.AtheAvaporApressureAofAaAliquidAjustAequalsAatmosphericApressure
FlashApointAisAthe:
a.AmaximumAtemperatureAofAaAliquidAatAwhichAitAgiveAoffAvaporsAsufficientAtoAformAanAign
itableAmixtureAwithAair
b.AmaximumAtemperatureAofAaAliquidAatAwhichAitAgivesAoffAvaporsAsufficientAtoAformAanAig
nitableAmixtureAwithAwater
c.AminimumAtemperatureAofAaAliquidAatAwhichAitAgivesAoffAvaporsAsufficientAtoAformAanAig
nitableAmixtureAwithAair
d.AminimumAtemperatureAofAaAliquidAatAwhichAitAgivesAoffAvaporsAsufficientAtoAformAanAig
nitableAmixtureAwithAwaterA-
AAnswerAc.AminimumAtemperatureAofAaAliquidAatAwhichAitAgivesAoffAvaporsAsufficientAtoAfo
rmAanAignitableAmixtureAwithAair
, BLEVEAisAtheAacronymAfor:
a.ABoilingALiquidsAEvaporateAVeryAExpensivelyA
b.ABoilingALiquidsAErodeAVeryAEfficientlyA
c.ABoilingALiquidsAEndAVaporAExplosionsA
d.ABoilingALiquidAExpandingAVaporAExplosionA-
AAnswerAd.ABoilingALiquidAExpandingAVaporAExplosion
Cobalt-60AhasAaA5AyearAhalfAlife.AIfAtheAinitialAactivityAofAaACobalt-
60AsourceAisA20AmCi,AwhatAisAtheAactivityAafterA10AyearsAinAmCi?
a.A5A
b.A0A
c.A2A
d.A10A-AAnswerAa.A5
TheAexposureArateAatAaAdistanceAofA1AfootAfromAaAradioactiveAsourceAisA20ArnR/hr.AWhatA
isAtheAexposureArateAinAmR/hr.AatA10Afeet?
a.A0.1A
b.A0.2A
c.A0.3A
d.A0.4A-AAnswerAb.A0.2
WhichAofAtheAfollowingAisAnotAregulatedAbyAEPAAasAanAenvironmentallyAtoxicAmetal?A
a.AarsenicA
b.Alead
c.Acadmium
d.AironA-AAnswerAd.Airon
WhichAofAtheAfollowingAchemicalsAisAheavierAthanAair?
ChemicalANameAVaporADensity
a.AMethaneA0.55
b.ACarbonAMonoxideA0.97
c.ANitrogenA0.97
