CHEM 3050 FINAL EXAM (ALL EXAM MULTIPLE CHOICE) QUESTIONS AND CORRECT ANSWERS

CHEM 3050 FINAL EXAM (ALL EXAM
MULTIPLE CHOICE) QUESTIONS AND
CORRECT ANSWERS
AA2sampleA2withA2aA2differentA2chemicalA2compositionA2fromA2placeA2toA2placeA2isA2aA2___
_______A2sample.

A)A2homologousA2
B)A2homogeneousA2
C)A2uniformA2
D)A2heterogeneousA2-A2Ans--D)A2heterogeneous

AA2calibrationA2curve,A2orA2standardA2curve,A2isA2necessaryA2inA2chemicalA2analysisA2toA2
________

A)A2reduceA2orA2eliminateA2aA2signalA2fromA2interferingA2speciesA2
B)A2confirmA2theA2identityA2ofA2theA2analyteA2
C)A2improveA2theA2resolutionA2ofA2theA2selectedA2methodA2
D)A2measureA2theA2detectorA2responseA2forA2differentA2analyteA2concentrationsA2-A2Ans--
D)A2measureA2theA2detectorA2responseA2forA2differentA2analyteA2concentrations

TrueA2orA2False:A2AA2standardA2deviationA2closeA2toA2zeroA2meansA2thatA2theA2pointsA2inA2
aA2dataA2setA2areA2closeA2toA2theA2"true"A2value.A2-A2Ans--False

AA2resultA2thatA2saysA2aA2concentrationA2isA2aboveA2aA2certainA2limit,A2butA2itA2isA2actuallyA
2below,A2itA2isA2aA2_____________.


A)A2reagentA2blankA2
B)A2falseA2negativeA2
C)A2falseA2positiveA2
D)A2fieldA2blankA2-A2Ans--C)A2falseA2positive

TheA2uncertaintyA2ofA2aA2buretA2isA2±0.05A2mL.A2TheA2trueA2valueA2ofA2aA2readingA2ofA217.
53A2mLA2isA2inA2theA2rangeA2________

A)A217.53A2toA217.63A2mLA2
B)A217.43A2toA217.53A2mLA2
C)A217.53A2toA217.58A2mLA2
D)A217.48A2toA217.58A2mLA2-A2Ans--D)A217.48A2toA217.58A2mL

AssumingA2aA2normalA2distribution,A2ifA2eachA2personA2inA2thisA2classA2(32A2students)A2flip
pedA2aA2coinA2once,A2forA2howA2manyA2studentsA2wouldA2theA2coinA2landA2onA2theA2"head
s"A2side?

, A)A2approximatelyA232A2
B)A2exactlyA232A2
C)A2exactlyA216A2
D)A2approximatelyA216A2-A2Ans--D)A2approximatelyA216

InA2aA2typicalA2calibrationA2curve,A2theA2dynamicA2rangeA2isA2typicallyA2______A2theA2linea
rA2range.

A)A2equalA2toA2
B)A2narrowerA2thanA2
C)A2widerA2thanA2
D)A2notA2relatedA2toA2-A2Ans--C)A2widerA2than

WhichA2statementA2describesA2theA2reportingA2limit?A2

A)A2ItA2isA2theA2limitA2atA2whichA2theA2analyteA2isA2notA2presentA2inA2theA2sample.A2
B)A2ItA2isA2aA2signalA23A2timesA2higherA2thanA2theA2instrumentalA2noise.A2
C)A2ItA2isA2theA2sameA2asA2theA2methodA2detectionA2limit.A2
D)A2ItA2isA2setA2toA2atA2leastA25A2toA210A2timesA2higherA2thanA2theA2detectionA2limit.A2-
A2Ans--D)A2ItA2isA2setA2toA2atA2leastA25A2toA210A2timesA2higherA2thanA2theA2detectionA2limit.


AsA2weA2increaseA2theA2numberA2ofA2measurementsA2(increaseA2n),A2whatA2willA2happenA
2toA2theA2rangeA2ofA2theA295%A2confidenceA2interval?A2


A)A2decreaseA2inA2rangeA2
B)A2noA2changeA2inA2rangeA2
C)A2increaseA2inA2rangeA2
D)A2rangeA2centerA2willA2shiftA2-A2Ans--A)A2decreaseA2inA2range

WhichA2ofA2theA2followingA2isA2NOTA2aA2characteristicA2ofA2randomA2errors?A2

A)A2ItA2arisesA2fromA2uncontrolledA2variablesA2inA2theA2measurement.A2
B)A2ItA2cannotA2beA2eliminatedA2completely.A2
C)A2ItA2hasA2anA2equalA2chanceA2toA2beA2positiveA2orA2negative.A2
D)A2ItA2arisesA2fromA2aA2flawA2inA2equipmentA2orA2theA2designA2ofA2anA2experiment.A2-
A2Ans--D)A2ItA2arisesA2fromA2aA2flawA2inA2equipmentA2orA2theA2designA2ofA2anA2experiment.


______A2isA2consistentA2errorA2thatA2canA2beA2detectedA2andA2corrected.A2

A)A2SystematicA2errorA2
B)A2RandomA2errorA2
C)A2UserA2errorA2
D)A2InternalA2errorA2-A2Ans--A)A2SystematicA2error