ANALYTICAL CHEMISTRY FINAL-
ACS EXAM QUESTIONS WITH
ANSWERS
ppm gv- gvANSWERS-(grams gvanalyte/grams gvsample)x10^6
Molarity gv- gvANSWERS-moles gvanalyte/liter gvof gvsolution
Volume gvPercent gv- gvANSWERS-(volume gvsolute/volume gvsoution)x100
Volume gvppm gv- gvANSWERS-(volume gvsolute/volume gvsolution)x10^6
kilo- gv- gvANSWERS-10^3
deci- gv- gvANSWERS-10^-1
centi- gv- gvANSWERS-10^-2
milli- gv- gvANSWERS-10^-3
micro- gv- gvANSWERS-10^-6
nano- gv- gvANSWERS-10^-9
pico- gv- gvANSWERS-10^-12
femto- gv- gvANSWERS-10^-15
weight gvpercent gv- gvANSWERS-(grams gvanalyte/grams gvsample)x100
ppt gv- gvANSWERS-(grams gvanalyte/grams gvsample)x10^3
ppt gvsimplified gv- gvANSWERS-gram gvanalyte/liter gvsolution
ppm gvsimplified gv- gvANSWERS-mg gvanalyte/liter gvsolution
ppb gvsimplified gv- gvANSWERS-micrograms gvanalyte/liter gvsolution
pptr gvsimplified gv- gvANSWERS-nanograms gvanalyte/liter gvsolution
buoyancy gvcorrection gv- gvANSWERS-m=(m'(1-(air gvdensity/weight gvdensity)))/(1-(air
gvdensity/object gvdensity))
accuracy gv- gvANSWERS-closeness gvof gvthe gvmean gvto gvthe gv"true gvvalue"
, precision gv- gvANSWERS-reproducibility gvof gvindividual gvmeasurements
Uncertainty gvin gvAddition/Subraction gv- gvANSWERS-e=sqrt(ex1^2+ex2^2+ex3^2+...)
Uncertainty gvin gvMultiplication/Division gv-
gvANSWERS-e=y*sqrt((ex1/x1)^2+(ex2/x2)^2+(ex3/x3)^2+...)
Significant gvFigures gvin gvLogarithms gvand gvantilogarithms gv- gvANSWERS-the gvnumber
gvof gvsignificant gvfigures gvin gvthe gvlog gvshould gvequal gvthe gvnumber gvof gvdigits gvin gvthe
gvmantissa
How gvmany gvsignificant gvfigures gvin gvlog(205.5) gv- gvANSWERS-four gvsignificant
gvfigures, gvso gvyou gvwill gvneed gvfour gvdecimal gvplaces gvin gvyour gvanswer
pH gv- gvANSWERS--log[H3O+]
[H3O+] gv- gvANSWERS-10^-pH
Absorbance gv- gvANSWERS--log(transmittance)
Random gvError gv- gvANSWERS--repeated gvmeasurements gvare gvsometimes gvhigh
gvand gvsometimes gvlow
-cannot gvbe gvcorrected gvfor
Systematic gvError gv- gvANSWERS--repeated gvmeasurements gvare gvusually gvalways
gvhigh gvor gvalways gvlow
-can gvand gvshould gvbe gvcorrected gvfor
Relative gvuncertainty= gv- gvANSWERS-absolute gvuncertainty/magnitude gvof
gvmeasurement
68% gvof gvmeasurements gvin gva gvGaussian gvCurve gvwill gvlie gv- gvANSWERS-between
gvthe gvmean-1 gvand gvthe gvmean+1
Variance gvin gvstandard gvdeviation gv- gvANSWERS-standard gvdeviation gvsquared
mean= gv- gvANSWERS-true gvvalue gv+-time*standard gvdeviation
T-test gvCase gv1 gv- gvANSWERS-measure gvsample gvof gvknown gvcomposition
T-test gvcase gv2 gv- gvANSWERS-compare gvreplicate gvmeasurement gvof gvan gvunknown
gvsample
T-test gvcase gv3 gv- gvANSWERS-compare gvindividual gvdifference gvof gvan gvunknown
gvsample
- gvtwo gvsets gvof gvdata gvanalyzed gvby gvboth gvmethods gvbeing gvused
T-test gvcase gv1 gvequation gv- gvANSWERS-true gvvalue= gvmean gv(+-) gv(time*standard
gvdeviation)/sqrt(number gvof gvmeasurements))
ACS EXAM QUESTIONS WITH
ANSWERS
ppm gv- gvANSWERS-(grams gvanalyte/grams gvsample)x10^6
Molarity gv- gvANSWERS-moles gvanalyte/liter gvof gvsolution
Volume gvPercent gv- gvANSWERS-(volume gvsolute/volume gvsoution)x100
Volume gvppm gv- gvANSWERS-(volume gvsolute/volume gvsolution)x10^6
kilo- gv- gvANSWERS-10^3
deci- gv- gvANSWERS-10^-1
centi- gv- gvANSWERS-10^-2
milli- gv- gvANSWERS-10^-3
micro- gv- gvANSWERS-10^-6
nano- gv- gvANSWERS-10^-9
pico- gv- gvANSWERS-10^-12
femto- gv- gvANSWERS-10^-15
weight gvpercent gv- gvANSWERS-(grams gvanalyte/grams gvsample)x100
ppt gv- gvANSWERS-(grams gvanalyte/grams gvsample)x10^3
ppt gvsimplified gv- gvANSWERS-gram gvanalyte/liter gvsolution
ppm gvsimplified gv- gvANSWERS-mg gvanalyte/liter gvsolution
ppb gvsimplified gv- gvANSWERS-micrograms gvanalyte/liter gvsolution
pptr gvsimplified gv- gvANSWERS-nanograms gvanalyte/liter gvsolution
buoyancy gvcorrection gv- gvANSWERS-m=(m'(1-(air gvdensity/weight gvdensity)))/(1-(air
gvdensity/object gvdensity))
accuracy gv- gvANSWERS-closeness gvof gvthe gvmean gvto gvthe gv"true gvvalue"
, precision gv- gvANSWERS-reproducibility gvof gvindividual gvmeasurements
Uncertainty gvin gvAddition/Subraction gv- gvANSWERS-e=sqrt(ex1^2+ex2^2+ex3^2+...)
Uncertainty gvin gvMultiplication/Division gv-
gvANSWERS-e=y*sqrt((ex1/x1)^2+(ex2/x2)^2+(ex3/x3)^2+...)
Significant gvFigures gvin gvLogarithms gvand gvantilogarithms gv- gvANSWERS-the gvnumber
gvof gvsignificant gvfigures gvin gvthe gvlog gvshould gvequal gvthe gvnumber gvof gvdigits gvin gvthe
gvmantissa
How gvmany gvsignificant gvfigures gvin gvlog(205.5) gv- gvANSWERS-four gvsignificant
gvfigures, gvso gvyou gvwill gvneed gvfour gvdecimal gvplaces gvin gvyour gvanswer
pH gv- gvANSWERS--log[H3O+]
[H3O+] gv- gvANSWERS-10^-pH
Absorbance gv- gvANSWERS--log(transmittance)
Random gvError gv- gvANSWERS--repeated gvmeasurements gvare gvsometimes gvhigh
gvand gvsometimes gvlow
-cannot gvbe gvcorrected gvfor
Systematic gvError gv- gvANSWERS--repeated gvmeasurements gvare gvusually gvalways
gvhigh gvor gvalways gvlow
-can gvand gvshould gvbe gvcorrected gvfor
Relative gvuncertainty= gv- gvANSWERS-absolute gvuncertainty/magnitude gvof
gvmeasurement
68% gvof gvmeasurements gvin gva gvGaussian gvCurve gvwill gvlie gv- gvANSWERS-between
gvthe gvmean-1 gvand gvthe gvmean+1
Variance gvin gvstandard gvdeviation gv- gvANSWERS-standard gvdeviation gvsquared
mean= gv- gvANSWERS-true gvvalue gv+-time*standard gvdeviation
T-test gvCase gv1 gv- gvANSWERS-measure gvsample gvof gvknown gvcomposition
T-test gvcase gv2 gv- gvANSWERS-compare gvreplicate gvmeasurement gvof gvan gvunknown
gvsample
T-test gvcase gv3 gv- gvANSWERS-compare gvindividual gvdifference gvof gvan gvunknown
gvsample
- gvtwo gvsets gvof gvdata gvanalyzed gvby gvboth gvmethods gvbeing gvused
T-test gvcase gv1 gvequation gv- gvANSWERS-true gvvalue= gvmean gv(+-) gv(time*standard
gvdeviation)/sqrt(number gvof gvmeasurements))
