Chem 103 Exam 1 Questions and Verified Answers 2025

Chem 103 Exam 1 Questions and Verified
Answers 2025
WhatAisAchemistry?A-ACORRECTAANSWERS-
ChemistryAisAtheAstudyAofAtheAphysicalAandAcompositionalAchangesAofAmatter.

ChemistryAisAcalledAtheACentralAScience.
A




AManyAhealthArelatedAareasAofAstudyAareAbasedAonAChemistry.
MatterA-ACORRECTAANSWERS-
MatterAisAanythingAthatAhasAmass,AoccupiesAspaceAandAisAmade-
upAofAatomsAorApartsAofAatoms.
MassA-ACORRECTAANSWERS--MassAisAaAmeasureAofAtheAamountAofAmatterAinAanAobject.
-MassAisAindependentAofAtheAlocationAofAanAobject.
-
AnAobjectAonAtheAearthAhasAtheAsameAmassAasAtheAsameAobjectAonAtheAmoon,AbutAnotAsa
meAweight.
WeightA-ACORRECTAANSWERS--
WeightAisAaAmeasureAofAgravitationalAforceAactingAonAobject.
-WeightAdependsAonAtheAlocationAofAanAobject.
-ForceA=AMassA*AAcceleration,AFA=Ama,AWtA=Am(gravity).
-
AnAobjectAweighingA1.0AlbAonAearth,AweighsAaboutA0.17AlbAonAtheAmoon.AMassAofAobjectAisA
constant.AMoonAhasA1/6AgravityAofAearth,AwhichAreducesAapparentAweightAofAobject.
PhysicalAPropertiesAofAMatterA-ACORRECTAANSWERS--
PhysicalApropertiesAcanAbeAobservedAorAmeasuredAwithoutAchangingAtheAcompositionAofAt
heAmatterAbeingAobserved.

ExamplesAofAphysicalApropertiesAare:Acolor,AshapeAandAmass,AandAallAchangesAofAstateAlik
eAgasAtoAaAliquid.
ChemicalAPropertiesAofAMatterA-ACORRECTAANSWERS--
ChemicalApropertiesAcanAbeAobservedAorAmeasuredAonlyAwhenAtheAcompositionAofAmatter
AisAchanged.




ExamplesAofAchemicalApropertiesAareAflammabilityAandAtheAabilityAtoAreactA(e.g.AwhenAvine
garAandAbakingAsodaAareAmixed).AAtomsAmustAchangeApartners.
PhysicalAchangesAofAMatterA-ACORRECTAANSWERS--PhysicalAchangesAareAreversible.
-
PhysicalAchangesAtakeAplaceAwithoutAaAchangeAinAcomposition.AAtomsAareAnotAchangingA
partners.
-NothingAnewAisAbeingAcreated.
ExamplesAofAphysicalAchangesAareAfreezing,Amelting,AorAevaporationAofAaAsubstanceA(e.g.
Awater).AH2O(s)A→AH2O(l),AiceA→Awater.

, SeparationAofAcompoundsAisAaAphysicalAchange.
ex/AseparatingAironAfilingAfromAsandAisAaAchemicalAreaction
ChemicalAChangesAofAmatterA-ACORRECTAANSWERS--
ChemicalAchangesAareAnotAalwaysAreversible.
-
ChemicalAchangesAareAalwaysAaccompaniedAbyAaAchangeAinAcomposition.AAtomsAareAcha
ngingApartners.
-NewAtypesAofAmatterAareAbeingAcreated,AO2A+A2H2A→A2H2O
ExamplesAofAchemicalAchangesAareAtheAburningAofApaperAandAtheAfizzingAofAaAmixtureAofAv
inegarAandAbakingAsoda.
DemocritusA(Greek,A460-370ABC)A-ACORRECTAANSWERS-
FirstApersonAwhoseAwritingsAsuggested,A
A-basedAonlyAonAlogic,AthatAatomsAwhereAtheA

AbasisAofAmatter.

-AtomsAcomesAfromAtheAwordA'atomos'A
AmeansA"noAcut".

-DemocritusAsaidAthereAwereAdifferentAtypesAofAatoms.
-MatterAwasAmadeAofAatomsAandAspaces,AcallAtheAvoid.
-Aristotle,A(384-
322ABC)AarguedAagainstAtheApossibilityAofAaAvoidAandAtheAatomicAtheoryAwasAlostAforAnearl
yA1500Ayears.
JohnADalton(EnglishA1766-1844)A-ACORRECTAANSWERS--
FatherAofAmodernAAtomicATheory
basedAonAexperimentalAevidenceAwithAgases
DaltonAAtomicAParticulateAModelAOfAMatterA-ACORRECTAANSWERS--
AllAmatterAisAmadeAupAofAtinyAparticlesAcalledAatoms.
-UniqueAtypesAofAatomsAareAcalledAelements.
-MoleculesAareAcollectionsAofAbondedAatoms.
-
CompoundAisAgeneralAtermAthatAincludesAmolecules,AatomsAandAionsA(atomsAnotAhavingAn
ormalAnumberAelectrons).
-CompoundsAhaveAaAfixedAratioAofAatoms.
-ChemicalAreactionsAdoAnotAcreateAorAdestroyAatoms.
-ChemicalAreactionsAcanAcreateAorAdestroyAcompounds.
ChemicalAViewAofAtheAAtomA-ACORRECTAANSWERS--
NucleusAisAtheAcenterAcontainingAprotonsA(+)AandAneutronsA(o).AElectronsA(-
)AareAonAtheAoutside.
-AtomicAnumberA=AnumberAofAprotons,AwhichAdefinesAelement.
-AtomicAmassA=AmassAofAprotonsAandAmassAofAneutrons.
-NumberAofAelectronsA=AnumberAofAprotonsAinAneutralAatom.
-NeutronAmassA=AprotonA+Aelectron.
ElementsA-ACORRECTAANSWERS--
ElementsAareApureAsubstancesAmadeAupAofAhomoatomicAmoleculesAorAindividualAatomsAo
fAtheAsameAkind.