Chemistry is the study of matter and the changes it undergoes. Here you can browse chemistry videos, articles, and exercises by topic. We keep the library ...Ifyou'reseeingthismessage,itmeanswe'rehavingtroubleloadingexternalresourcesonourwebsite.Ifyou'rebehindawebfilter,pleasemakesurethatthedomains*.kastatic.organd*.kasandbox.orgareunblocked.CoursesSearchDonateLoginSignupSearchforcourses,skills,andvideosMaincontentScienceChemistrylibraryScienceChemistrylibraryWelcometotheChemistrylibrary!Chemistryisthestudyofmatterandthechangesitundergoes.Hereyoucanbrowsechemistryvideos,articles,andexercisesbytopic.Wekeepthelibraryup-to-date,soyoumayfindneworimprovedmaterialhereovertime.CoursesummaryAtoms,compounds,andionsIntroductiontotheatom:Atoms,compounds,andionsIonsandcompounds:Atoms,compounds,andionsNamesandformulasofioniccompounds:Atoms,compounds,andionsMoreaboutatomsMolesandmolarmass:MoreaboutatomsIsotopes:MoreaboutatomsMoreaboutmolecularcompositionPuresubstances:MoreaboutmolecularcompositionMixtures:MoreaboutmolecularcompositionMassspectrometryMassspectrometry:MassspectrometryChemicalreactionsandstoichiometryBalancingchemicalequations:ChemicalreactionsandstoichiometryStoichiometry:ChemicalreactionsandstoichiometryLimitingreagentstoichiometry:ChemicalreactionsandstoichiometryMolecularcomposition:ChemicalreactionsandstoichiometryTypesofchemicalreactions:ChemicalreactionsandstoichiometryMoreaboutchemicalreactionsNetionicequations:MoreaboutchemicalreactionsRepresentationsofreactions:MoreaboutchemicalreactionsPhysicalandchemicalchanges:MoreaboutchemicalreactionsMoreaboutstoichiometry:MoreaboutchemicalreactionsElectronicstructureofatomsHistoryofatomicstructure:ElectronicstructureofatomsBohr'smodelofthehydrogenatom:ElectronicstructureofatomsQuantumnumbersandorbitals:ElectronicstructureofatomsElectronconfigurations:ElectronicstructureofatomsPeriodictableIntroductiontotheperiodictable:PeriodictablePeriodictabletrends:PeriodictableChemicalbondsTypesofchemicalbonds:ChemicalbondsBonden