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CHEM TEST 4 (got 96%)

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Department
Chemistry
Course
CHEM 1001
Professor
All Professors
Semester
Winter

Description
CHEMTEST4CHAPTER7ChemicalreactionthetransformationofoneormoresubstancesintodifferentsubstancesReactionsthatoccurinliquidsandformagasaregasevolutionreactionsReactionsinwhichasubstancereactswithoxygenemittingheatandformingoneormoreoxygencontainingcompoundsarecombustionreactionsTheyareasubcategoryofoxidationreductionreactionsinwhichelectronsaretransferredfromonesubstancetoanotherReactionsthatformsolidsubstancesinwaterareprecipitationreactionsChemicalreactionsproducechangesinthearrangementsofthemoleculesandatomsthatcomposematterColorchangesareevidencethatachemicalreactionhasoccurredOtherchangesthatidentifychemicalreactionsincludetheformationofasolidortheformationofagasHeatabsorptionoremissionaswellaslightemissionarealsoevidenceofreactionsWhilethesechangesprovideevidenceofachemicalreactiontheyarenotdefinitiveevidenceOnlychemicalanalysisshowingthattheinitialsubstanceshavechangedintoothersubstancesconclusivelyprovesthatachemicalreactionhasoccurredWerepresentchemicalreactionswithchemicalequationsSubstancesontheleftarereactionsandthesubstancesontherightsideareproductsgRepresentsgasSincechemicalequationsrepresentrealchemicalreactionsatomscannotsimplyappearordisappearinchemicalequationsbecauseatomsdontsimplyappearordisappearinnatureWemustaccountfortheatomsonbothsidesoftheequationWemustcreatebalancedequationsoneinwhichthenumbersofeachtypeofatomonbothsidesoftheequationareequalTobalanceanequationweinsertcoefficientsinfrontofthechemicalformulasasneededtomakethenumberofeachtypeofatominthereactantsequaltothenumberofeachtypeofatomintheproductsWhenwebalancechemicalequationsbyinsertingcoefficientsasneededinfrontoftheformulasofthereactantsandproductsitchangesthenumberofmoleculesintheequationbutitdoesnotchangethekindsofmoleculesThenumberofaparticulartypeofatomwithinachemicalformulaembeddedinanequationisobtainedbymultiplyingthesubscriptfortheatombythecoefficientforthechemicalformulaAnaqueoussolutionisahomogeneousmixtureofasubstancewithwaterSubstancesthatcompletelydissociateintoionsinsolutionarecalledstrongelectrolytesandtheresultantsolutionsarecalledstrongelectrolytesolutionsWhenpolyatomicionsdissolvethepolyatomicionsdissolveasintactunitsNotallioniccompoundsdissolveinwaterAcompoundissolubleinaparticularliquidifitdissolvesinthatliquidacompoundisinsolubleifitdoesnotdissolveintheliquid
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