ANALYTICAL CHEM PRELIMS QUESTIONS AND CORRECT ANSWERS

ANALYTICAL CHEM PRELIMS
QUESTIONS AND CORRECT ANSWERS
AnalyticalA2ChemistryA2-A2Ans--
isA2aA2measurementA2scienceA2consistingA2aA2setA2ofA2powerfulA2ideasA2andA2methodsA2t
hatA2areA2usefulA2inA2allA2fieldsA2ofA2scienceA2andA2medicine.

QualitativeA2analysisA2-A2Ans--
establishesA2theA2chemicalA2identityA2ofA2theA2speciesA2inA2theA2sample.

QualitativeA2analysisA2-A2Ans--
RevealsA2theA2identityA2ofA2theA2elementsA2andA2compoundsA2inA2aA2sample.

QuantitativeA2analysisA2-A2Ans--
determinesA2theA2relativeA2amountsA2ofA2theseA2species,A2orA2analytes,A2inA2numericalA2t
erms.

QuantitativeA2analysisA2-A2Ans--
IndicatesA2theA2amountA2ofA2eachA2substanceA2inA2aA2sample.

AnalytesA2-A2Ans--areA2theA2componentsA2ofA2aA2sampleA2toA2beA2determined.

MassA2orA2VolumeA2ofA2theA2sample;A2MeasurementA2ofA2someA2quantityA2thatA2isA2propo
rtionalA2toA2theA2amountA2ofA2analyteA2inA2theA2sampleA2suchA2as:A2Mass,A2Volume,A2Inte
nsity,A2ElectricalA2chargeA2-A2Ans--
TwoA2typesA2ofA2measurementA2inA2quantitativeA2analysis:

GravimetricA2methodsA2-A2Ans--
determineA2theA2massA2ofA2theA2analyteA2orA2someA2compoundA2chemicallyA2relatedA2toA2
it.

VolumetricA2methodA2-A2Ans--
theA2volumeA2ofA2aA2solutionA2containingA2sufficientA2reagentA2toA2reactA2completelyA2with
A2theA2analyteA2isA2measured.


ElectroanalyticalA2methodsA2-A2Ans--
involveA2theA2measurementA2ofA2suchA2electricalA2propertiesA2asA2voltage,A2current,A2resi
stance,A2andA2quantityA2ofA2electricalA2charge.

SpectroscopicA2methodA2-A2Ans--
basedA2onA2measurementA2ofA2theA2interactionA2betweenA2electromagneticA2radiationA2a
ndA2analyteA2atomsA2orA2moleculesA2orA2onA2theA2productionA2ofA2suchA2radiationA2byA2an
alytes.

, ChoosingA2aA2method;A2AcquiringA2theA2sample;A2ProcessingA2theA2sample;A2EliminatingA
2theA2interferences;A2CalibratingA2andA2measuringA2concentration;A2CalculatingA2theA2res
ults;A2EvaluatingA2resultsA2byA2estimatingA2reliabilityA2-A2Ans--
StepsA2inA2aA2typicalA2QuantitativeA2Analysis

SelectedA2methodA2-A2Ans--
usuallyA2representsA2aA2compromiseA2betweenA2theA2accuracyA2neededA2andA2theA2timeA
2andA2moneyA2thatA2areA2availableA2forA2theA2analysis.


SamplingA2-A2Ans--
involvesA2obtainingA2aA2smallA2massA2ofA2aA2materialA2whoseA2compositionA2accuratelyA2r
epresentsA2theA2bulkA2ofA2theA2materialA2beingA2sampled.

ReplicateA2samplesA2-A2Ans--
orA2replicates,A2areA2portionsA2ofA2aA2materialA2ofA2aA2approximatelyA2theA2sameA2sizeA2th
atA2areA2carriedA2throughA2anA2analyticalA2procedureA2atA2theA2sameA2timeA2andA2inA2theA2
sameA2way.

SpecificA2-A2Ans--techniquesA2orA2reactionsA2thatA2workA2forA2onlyA2oneA2analyte.

SelectiveA2-A2Ans--techniquesA2orA2reactionsA2thatA2applyA2forA2onlyA2aA2fewA2analytes.

MatrixA2-A2Ans--
orA2sampleA2matrix,A2allA2ofA2theA2componentsA2inA2theA2sampleA2containingA2anA2analyte.

InterferencesA2-A2Ans--
speciesA2otherA2thanA2theA2analyteA2thatA2affectA2theA2finalA2measurement

CalibrationA2-A2Ans--theA2processA2ofA2determiningA2k.

PrimaryA2StandardA2GradeA2-A2Ans--
isA2anA2ultrapureA2compoundA2thatA2servesA2asA2theA2referenceA2materialA2forA2aA2titration
A2orA2forA2anotherA2quantitativeA2analysis.


PropertiesA2ofA2PSG:A2-A2Ans--
HighA2Purity;A2AtmosphericA2stability;A2AbsenceA2ofA2hydrateA2water;A2ModestA2cost;A2Re
asonableA2solubility;A2LargerA2molarA2mass

SecondaryA2StandardA2GradeA2-A2Ans--
CompoundA2whoseA2purityA2hasA2beenA2determinedA2byA2chemicalA2analysis.

SecondaryA2StandardA2GradeA2-A2Ans--
ServesA2asA2theA2workingA2standardA2materialA2forA2titrationsA2andA2forA2manyA2otherA2an
alyses.