ANALYTICAL CHEMISTRY EXAM 1 ~
PRACTICE QUESTIONS AND CORRECT
ANSWERS
WhatA2isA2theA2differenceA2betweenA2qualitativeA2andA2quantitativeA2analysis?A2-A2Ans--
QualitativeA2establishesA2theA2chemicalA2identityA2ofA2theA2speciesA2inA2aA2sample
QuantitativeA2determinesA2theA2relativeA2amountsA2ofA2theA2speciesA2(analytes)
WhatA2isA2anA2analyte?A2-A2Ans--substanceA2ofA2interest
WhatA2areA2theA2stepsA2inA2aA2chemicalA2analysis?A2-A2Ans---A2FormulateA2aA2Question
-A2SelectA2AnalyticalA2Procedure
-A2Sampling
-A2SampleA2Preparation
-A2AnalysisA2(assessedA2uncertainty)
-A2ReportA2Results
-A2DrawingA2Conclusions
WhatA2doesA2itA2meanA2toA2maskA2anA2interferingA2species?A2-A2Ans--
ToA2maskA2anA2interferingA2speciesA2isA2theA2transformationA2ofA2theA2interferingA2species
A2intoA2aA2non-interferingA2species
WhatA2isA2theA2purposeA2ofA2aA2calibrationA2curve?A2-A2Ans--
AA2graphA2detectorA2responseA2asA2aA2functionA2ofA2analyteA2concentration.
WhatA2isA2theA2differenceA2betweenA2aA2homogeneousA2materialA2andA2aA2heterogeneou
sA2material?A2-A2Ans--HomogeneousA2=A2compositionA2isA2theA2sameA2everywhere.
HeterogeneousA2=A2oneA2whoseA2compositionA2differsA2fromA2placeA2toA2place
WhatA2isA2theA2mostA2criticalA2partA2ofA2theA2analyticalA2process?A2-A2Ans--sampling
WhatA2areA2theA2unitsA2forA2weightA2percent?A2-A2Ans--gA2ofA2soluteA2/A2gA2ofA2solution
WhatA2areA2theA2unitsA2forA2m?A2-A2Ans--MolalityA2=A2molA2ofA2solute/kgA2ofA2solvent
WhatA2areA2theA2unitsA2forA2M?A2-A2Ans--MolarityA2=A2molA2ofA2soluteA2/A2L
HowA2manyA2gA2inA2aA2mg?A2-A2Ans--1A2gA2=A21000A2mg
HowA2manyA2LA2inA2aA2mL?A2-A2Ans--1A2LA2=A21000A2mL
PRACTICE QUESTIONS AND CORRECT
ANSWERS
WhatA2isA2theA2differenceA2betweenA2qualitativeA2andA2quantitativeA2analysis?A2-A2Ans--
QualitativeA2establishesA2theA2chemicalA2identityA2ofA2theA2speciesA2inA2aA2sample
QuantitativeA2determinesA2theA2relativeA2amountsA2ofA2theA2speciesA2(analytes)
WhatA2isA2anA2analyte?A2-A2Ans--substanceA2ofA2interest
WhatA2areA2theA2stepsA2inA2aA2chemicalA2analysis?A2-A2Ans---A2FormulateA2aA2Question
-A2SelectA2AnalyticalA2Procedure
-A2Sampling
-A2SampleA2Preparation
-A2AnalysisA2(assessedA2uncertainty)
-A2ReportA2Results
-A2DrawingA2Conclusions
WhatA2doesA2itA2meanA2toA2maskA2anA2interferingA2species?A2-A2Ans--
ToA2maskA2anA2interferingA2speciesA2isA2theA2transformationA2ofA2theA2interferingA2species
A2intoA2aA2non-interferingA2species
WhatA2isA2theA2purposeA2ofA2aA2calibrationA2curve?A2-A2Ans--
AA2graphA2detectorA2responseA2asA2aA2functionA2ofA2analyteA2concentration.
WhatA2isA2theA2differenceA2betweenA2aA2homogeneousA2materialA2andA2aA2heterogeneou
sA2material?A2-A2Ans--HomogeneousA2=A2compositionA2isA2theA2sameA2everywhere.
HeterogeneousA2=A2oneA2whoseA2compositionA2differsA2fromA2placeA2toA2place
WhatA2isA2theA2mostA2criticalA2partA2ofA2theA2analyticalA2process?A2-A2Ans--sampling
WhatA2areA2theA2unitsA2forA2weightA2percent?A2-A2Ans--gA2ofA2soluteA2/A2gA2ofA2solution
WhatA2areA2theA2unitsA2forA2m?A2-A2Ans--MolalityA2=A2molA2ofA2solute/kgA2ofA2solvent
WhatA2areA2theA2unitsA2forA2M?A2-A2Ans--MolarityA2=A2molA2ofA2soluteA2/A2L
HowA2manyA2gA2inA2aA2mg?A2-A2Ans--1A2gA2=A21000A2mg
HowA2manyA2LA2inA2aA2mL?A2-A2Ans--1A2LA2=A21000A2mL