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QUANTITATIVE CHEMICAL ANALYSIS EXAM #1 PRACTICE PROBLEMS QUESTIONS AND CORRECT ANSWERS

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QUANTITATIVE CHEMICAL ANALYSIS EXAM #1 PRACTICE PROBLEMS QUESTIONS AND CORRECT ANSWERS

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QUANTITATIVE CHEMICAL ANALYSIS
EXAM #1 PRACTICE PROBLEMS
QUESTIONS AND CORRECT ANSWERS
What'sA2theA2differenceA2betweenA2qualitativeA2andA2quantitativeA2analysis?A2-A2Ans--
QualitativeA2analysisA2tellsA2usA2whatA2isA2present,A2andA2quantitativeA2tellsA2usA2howA2m
uchA2isA2present

ListA2theA2stepsA2inA2aA2chemicalA2analysis.A2-A2Ans--FormulateA2theA2question
•A2SelectA2anA2analyticalA2procedure
•A2ObtainA2samples
•A2SampleA2preparation
•A2Analysis
•A2ReportingA2andA2interpretation
•A2DrawingA2conclusions

WhatA2doesA2itA2meanA2toA2maskA2anA2interferingA2species?A2-A2Ans--
ToA2maskA2anA2interferingA2speciesA2isA2theA2transformationA2ofA2theA2interferingA2species
A2intoA2aA2non-interferingA2species


WhatA2isA2theA2purposeA2ofA2aA2calibrationA2curve?A2-A2Ans--
AA2graphA2detectorA2responseA2asA2aA2functionA2ofA2analyteA2concentration.

WhatA2isA2theA2differenceA2betweenA2aA2homogeneousA2materialA2andA2aA2heterogeneou
sA2material?A2-A2Ans--HomogeneousA2=A2compositionA2isA2theA2sameA2everywhere.
HeterogeneousA2=A2oneA2whoseA2compositionA2differsA2fromA2placeA2toA2place

WhatA2areA2theA2SIA2unitsA2forA2length,A2mass,A2time,A2electricA2current,A2temperature,A2a
ndA2amountA2ofA2substanceA2(writeA2theirA2abbreviations)A2-A2Ans--
MeterA2(m),A2kilogramA2(kg),A2secondA2(s),A2ampereA2(A),A2KelvinA2(K),A2moleA2(mol)

WhatA2areA2theA2unitsA2andA2symbolsA2forA2frequency,A2force,A2pressure,A2energyA2andA2p
owerA2-A2Ans--hertzA2(Hz),A2newtonA2(N),A2pascalA2(Pa),A2jouleA2(J),A2wattA2(W)

WriteA2theA2nameA2andA2numberA2forA2mW,A2kOhm,A2TJ,A2fg,A2pm,A2muF,A2ns,A2dPa.A2-
A2Ans--milliwattA2=A210^-3A2watt
kiloohmA2=A210^3A2ohm
terajouleA2=A210^12A2joule
femtogramA2=A210^-15A2gram
picometerA2=A210^-12A2meter
microfaradA2=A210^-6A2farad
nanosecondsA2=A210^-9A2seconds
decipascalA2=A210^-1A2pascal

, TheA2burningA2ofA2fossilA2fuelA2byA2humansA2inA22012A2introducedA2approximatelyA28A2pet
agramsA2(Pg)A2ofA2carbonA2perA2yearA2intoA2theA2atmosphereA2inA2theA2formA2ofA2CO2.
HowA2manyA2kgA2ofA2CA2areA2placedA2inA2theA2atmosphereA2eachA2year?
howA2manyA2kgA2ofA2CO2A2areA2placedA2inA2theA2atmosphereA2eachA2year?
AA2metricA2tonA2isA21000kg.A2HowA2manyA2metricA2tonsA2ofA2CO2A2areA2placedA2inA2theA2a
tmosphereA2eachA2year?
A2IfA2thereA2areA27A2billionA2peopleA2onA2Earth,A2whatA2isA2theA2perA2capitaA2rateA2ofA2CO2A
2production?A2-A2Ans--8x10^12kgA2C
2.9x10^13A2kgA2CO2
4A2tonsA2CO2A2perA2person

WhatA2isA2theA2formalA2concentrationA2ofA2NaClA2whenA232.0A2gA2areA2dissolvedA2inA2wate
rA2andA2dilutedA2toA20.5L?A2-A2Ans--1.1M

HowA2manyA2gramsA2ofA2methanolA2(FMA232.04)A2areA2containedA2inA20.1LA2ofA21.71MA2a
quaousA2methanol?A2-A2Ans--5.48g

AnyA2diluteA2aqueousA2solutionA2hasA2aA2densityA2nearA21.00A2g/
mL.A2SupposeA2theA2solutionA2containsA21A2ppmA2ofA2solute;A2expressA2theA2concentratio
nA2ofA2soluteA2inA2g/L,A2mug/L,A2mug/mL,A2andA2mg/L.A2-A2Ans--10^-3g/L,A210^3A2mug/
L,A21A2mug/mL,A21mg/L

TheA2concentrationA2ofA2theA2alkaneA2C20H42A2(FMA2282.56)A2inA2aA2particularA2sampleA2
ofA2rainwaterA2isA20.2A2ppb.A2AssumeA2theA2densityA2ofA2rainwaterA2isA2closeA2toA21.00A2g/
mLA2andA2findA2theA2molarA2concentrationA2ofA2C20H42.A2-A2Ans--7x10^-10M

HowA2manyA2gramsA2ofA2percloricA2acid,A2HClO4,A2areA2containedA2inA237.6gA2ofA270.5A2
%wtA2aqueousA2perchloricA2acid?
A2HowA2manyA2gramsA2ofA2waterA2areA2inA2theA2sameA2solution?A2-A2Ans--
26.5gA2HClO4,A211.1gA2H2O

AnA2aqueousA2solutionA2containingA220.0A2wt%A2KIA2hasA2aA2densityA2ofA21.168A2g/
mL.A2FindA2theA2molalityA2ofA2theA2KIA2solution.A2-A2Ans--1.51m

AA2cellA2inA2yourA2adrenalA2glandA2hasA2aboutA22.5A2xA210^4A2tinyA2compartmentsA2calledA
2vesiclesA2thatA2containA2theA2hormoneA2epinephrine.A2
AnA2entireA2cellA2hasA2aboutA2150A2fmolA2ofA2epinephrine.A2HowA2manyA2attomolesA2(amo
l)A2ofA2epinephrineA2areA2inA2eachA2vesicle?
HowA2manyA2moleculesA2ofA2epinephrineA2areA2inA2eachA2vesicle?A2-A2Ans--6.0amol/
vesicle
3.6x10^6A2molecules

TheA2concentrationA2ofA2sugarA2(C6H12O6)A2inA2humanA2bloodA2rangesA2fromA2aboutA280
A2mg/dLA2beforeA2mealsA2toA2120A2mg/

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