Analytical Chemistry Final- ACS Exam
(2025) Actual Exam Questions and
Answers A+ Graded
ppm .- .CORRECT .ANSWER .-(grams .analyte/grams .sample)x10^6
Molarity .- .CORRECT .ANSWER .-moles .analyte/liter .of .solution
Volume .Percent .- .CORRECT .ANSWER .-(volume .solute/volume .soution)x100
Volume .ppm .- .CORRECT .ANSWER .-(volume .solute/volume .solution)x10^6
kilo- .- .CORRECT .ANSWER .-10^3
deci- .- .CORRECT .ANSWER .-10^-1
centi- .- .CORRECT .ANSWER .-10^-2
milli- .- .CORRECT .ANSWER .-10^-3
micro- .- .CORRECT .ANSWER .-10^-6
nano- .- .CORRECT .ANSWER .-10^-9
pico- .- .CORRECT .ANSWER .-10^-12
femto- .- .CORRECT .ANSWER .-10^-15
weight .percent .- .CORRECT .ANSWER .-(grams .analyte/grams .sample)x100
ppt .- .CORRECT .ANSWER .-(grams .analyte/grams .sample)x10^3
ppt .simplified .- .CORRECT .ANSWER .-gram .analyte/liter .solution
ppm .simplified .- .CORRECT .ANSWER .-mg .analyte/liter .solution
ppb .simplified .- .CORRECT .ANSWER .-micrograms .analyte/liter .solution
pptr .simplified .- .CORRECT .ANSWER .-nanograms .analyte/liter .solution
, buoyancy .correction .- .CORRECT .ANSWER .-m=(m'(1-(air .density/weight
.density)))/(1-(air .density/object .density))
accuracy .- .CORRECT .ANSWER .-closeness .of .the .mean .to .the ."true .value"
precision .- .CORRECT .ANSWER .-reproducibility .of .individual .measurements
Uncertainty .in .Addition/Subraction .- .CORRECT .ANSWER .-
e=sqrt(ex1^2+ex2^2+ex3^2+...)
Uncertainty .in .Multiplication/Division .- .CORRECT .ANSWER .-
e=y*sqrt((ex1/x1)^2+(ex2/x2)^2+(ex3/x3)^2+...)
Significant .Figures .in .Logarithms .and .antilogarithms .- .CORRECT .ANSWER .-the
.number .of .significant .figures .in .the .log .should .equal .the .number .of .digits .in
.the .mantissa
How .many .significant .figures .in .log(205.5) .- .CORRECT .ANSWER .-four
.significant .figures, .so .you .will .need .four .decimal .places .in .your .answer
pH .- .CORRECT .ANSWER .--log[H3O+]
[H3O+] .- .CORRECT .ANSWER .-10^-pH
Absorbance .- .CORRECT .ANSWER .--log(transmittance)
Random .Error .- .CORRECT .ANSWER .--repeated .measurements .are .sometimes
.high .and .sometimes .low
-cannot .be .corrected .for
Systematic .Error .- .CORRECT .ANSWER .--repeated .measurements .are .usually
.always .high .or .always .low
-can .and .should .be .corrected .for
Relative .uncertainty= .- .CORRECT .ANSWER .-absolute .uncertainty/magnitude .of
.measurement
68% .of .measurements .in .a .Gaussian .Curve .will .lie .- .CORRECT .ANSWER .-
between .the .mean-1 .and .the .mean+1
Variance .in .standard .deviation .- .CORRECT .ANSWER .-standard .deviation
.squared
mean= .- .CORRECT .ANSWER .-true .value .+-time*standard .deviation
T-test .Case .1 .- .CORRECT .ANSWER .-measure .sample .of .known .composition
T-test .case .2 .- .CORRECT .ANSWER .-compare .replicate .measurement .of .an
.unknown .sample
(2025) Actual Exam Questions and
Answers A+ Graded
ppm .- .CORRECT .ANSWER .-(grams .analyte/grams .sample)x10^6
Molarity .- .CORRECT .ANSWER .-moles .analyte/liter .of .solution
Volume .Percent .- .CORRECT .ANSWER .-(volume .solute/volume .soution)x100
Volume .ppm .- .CORRECT .ANSWER .-(volume .solute/volume .solution)x10^6
kilo- .- .CORRECT .ANSWER .-10^3
deci- .- .CORRECT .ANSWER .-10^-1
centi- .- .CORRECT .ANSWER .-10^-2
milli- .- .CORRECT .ANSWER .-10^-3
micro- .- .CORRECT .ANSWER .-10^-6
nano- .- .CORRECT .ANSWER .-10^-9
pico- .- .CORRECT .ANSWER .-10^-12
femto- .- .CORRECT .ANSWER .-10^-15
weight .percent .- .CORRECT .ANSWER .-(grams .analyte/grams .sample)x100
ppt .- .CORRECT .ANSWER .-(grams .analyte/grams .sample)x10^3
ppt .simplified .- .CORRECT .ANSWER .-gram .analyte/liter .solution
ppm .simplified .- .CORRECT .ANSWER .-mg .analyte/liter .solution
ppb .simplified .- .CORRECT .ANSWER .-micrograms .analyte/liter .solution
pptr .simplified .- .CORRECT .ANSWER .-nanograms .analyte/liter .solution
, buoyancy .correction .- .CORRECT .ANSWER .-m=(m'(1-(air .density/weight
.density)))/(1-(air .density/object .density))
accuracy .- .CORRECT .ANSWER .-closeness .of .the .mean .to .the ."true .value"
precision .- .CORRECT .ANSWER .-reproducibility .of .individual .measurements
Uncertainty .in .Addition/Subraction .- .CORRECT .ANSWER .-
e=sqrt(ex1^2+ex2^2+ex3^2+...)
Uncertainty .in .Multiplication/Division .- .CORRECT .ANSWER .-
e=y*sqrt((ex1/x1)^2+(ex2/x2)^2+(ex3/x3)^2+...)
Significant .Figures .in .Logarithms .and .antilogarithms .- .CORRECT .ANSWER .-the
.number .of .significant .figures .in .the .log .should .equal .the .number .of .digits .in
.the .mantissa
How .many .significant .figures .in .log(205.5) .- .CORRECT .ANSWER .-four
.significant .figures, .so .you .will .need .four .decimal .places .in .your .answer
pH .- .CORRECT .ANSWER .--log[H3O+]
[H3O+] .- .CORRECT .ANSWER .-10^-pH
Absorbance .- .CORRECT .ANSWER .--log(transmittance)
Random .Error .- .CORRECT .ANSWER .--repeated .measurements .are .sometimes
.high .and .sometimes .low
-cannot .be .corrected .for
Systematic .Error .- .CORRECT .ANSWER .--repeated .measurements .are .usually
.always .high .or .always .low
-can .and .should .be .corrected .for
Relative .uncertainty= .- .CORRECT .ANSWER .-absolute .uncertainty/magnitude .of
.measurement
68% .of .measurements .in .a .Gaussian .Curve .will .lie .- .CORRECT .ANSWER .-
between .the .mean-1 .and .the .mean+1
Variance .in .standard .deviation .- .CORRECT .ANSWER .-standard .deviation
.squared
mean= .- .CORRECT .ANSWER .-true .value .+-time*standard .deviation
T-test .Case .1 .- .CORRECT .ANSWER .-measure .sample .of .known .composition
T-test .case .2 .- .CORRECT .ANSWER .-compare .replicate .measurement .of .an
.unknown .sample
