Exam (elaborations)
CHM 2046L.
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Exam of 6 pages for the course CHM 1100C at CHM 1100C (CHM 2046L.)
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CHM 2046L - FINAL EXAM QUESTIONSAND ANSWERS
True hor hFalse: hIf hyou hare hlate hto hclass, hyou hcan htake hthe hquiz hafter hthe hlab his
hover h- h✔✔False
List h4 hpieces hof hPPE h(personal hprotective hequipment) hthat hmust halways hbe hworn
hin hthe hlab h- h✔✔- hSafety hgoggles
- hLab hcoat
- hLong hpants/skirts
- hNo hcrop htops
- hLong hhair htied hup
True hor hFalse: hThe hvolume hof ha hmixture his halways hthe hsame has hthe hsum hof hthe
hindividual hvolumes h- h✔✔False
Ex. hWhen hmixing h10mL hof hrubbing halcohol hwith h10mL hof hwater, hthe htotal hvolume
hwill hbe hless hthan h20mL
Is hthe hmass hof ha hmixture halways hthe hsum hof hthe hindividual hmasses? hHow his hthat
hdifferent hthan hvolume? h- h✔✔Yes, hdue hto hthe hlaw hof hconsideration hof hmass,
hmasses hare hadditive. hVolumes hare hnot hadditive hdue hto hthe hdifferent hmolecular
hcomponents hof heach hliquid h(size hof hmolecules)
What his hyour hGTA's hname? h- h✔✔Krystal hBaez
Accuracy h- h✔✔How hclose ha hmeasurement his hto hthe htrue/actual hvalue
Precision h- h✔✔How hclose htogether, hor hcommon, hthe hmeasurements hare
How hwould hyou hround ha hgraduated hcylinder hmeasurement? h- h✔✔Ex. h2.65
How hdoes hTD hdictate hhow hglassware his hused hin hthe hlab? h- h✔✔TD h= hTo hdeliver
ha hliquid
Ex. hPipettes, hburets
How hdoes hTC hdictate hhow hglassware his hused hin hthe hlab? h- h✔✔TC h= hTo hcontain
Ex. hBeaker, hvolumetric hflask
Why hare hstudents hexpected hto hdevelop htheir hown hexperimental hprocedures hin hthe
hchemistry hlab? h- h✔✔To hdevelop hcritical hthinking hskills hand hincrease htheir
hunderstanding hof hchemistry hconcepts
, Random hError h- h✔✔Errors hcannot hbe hfixed hand htherefore hcan honly hbe haccounted
hfor
Systematic hError h- h✔✔Errors hthat halways hoccurs hin hthe hsame hdirection; hcan hbe
hfixed
Find hthe hdensity hof ha hsubstance hthat hhas ha hmass hof h49.87g hand ha hvolume hof
h50.0mL h- h✔✔Density h= hMass/Volume
Density h= h49.87g/50.0mL
An haqueous hsolution hof hcalcium hcarbonate h(CaCO3) hdoes hnot hmake hthe hlight
hbulb hlight hup. hUse hchemical hterminology hto hexplain hwhy hthis hmight hbe h-
h✔✔CaCO3 hdoes hnot hconduct helectricity hor hionize hin hsolutions hbecause hit his ha
hnonelectrolyte
Dissociation h- h✔✔Substance hbreaks hdown hinto hcomponents hof hions h(does hnot
hinclude hnonelectrolytes)
Solubility h- h✔✔The hability hof ha hsubstance hto hdissolve hin hanother h(includes hstrong,
hweak, hand hnonelectrolytes); hnot hdependent hon hamount hof hionization
Classify heach hof hthe hfollowing hcompounds has heither hstrong helectrolyte, hweak
helectrolyte, hor ha hnonelectrolyte
a. hSodium hChloride h(NaCl)
b. hHydrochloric hAcid h(HCl)
c. hSugar h(Glycose) h- h✔✔a. hStrong helectrolyte
b. hStrong helectrolyte
c. hNonelectrolyte
Weak hElectrolytes h- h✔✔Compounds hwhose hsolutions hcontain ha hsmall hfraction hof
hthe hsolute hin hthe hform hof hions hand hconduct hsmall hamounts hof hcurrent
Ex. hNH3
Strong hElectrolytes h- h✔✔Compounds hwhose hsolutions hcontain ha hlarge hfraction hof
hthe hsolute hin hthe hform hof hions hand hconduct hlarge hamounts hof hcurrent
Ex. hNaOH, hH2SO4
A hchemical hreaction hwas hcarried hout husing h23.5mL hof h1.2M hacetic hacid. hHow
hmany hmoles hof hCH3COOH hwere hused? h- h✔✔Moles h= hMolarity h(M) hx hVolume h(L)
Moles h= h1.2M hx h0.0235L
Aqueous hSolution h- h✔✔A hsolution hcomposed hof hmultiple hsubstances, htypically ha
hsolute hand hH2O
Pure hSubstance h- h✔✔A hsolution hwith honly h1 hcomponent, hit his h100% hof ha hsingular
hsubstance
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