Analytical Chemistry Final- ACS Exam
With Detailed Questions And Correct
Answers||Latest Exam 2026-
2027||Already Graded A+
Molarity -ANSWER moles analyte/liter of solution
Volume Percent -ANSWER (volume solute/volume soution)x100
Volume ppm -ANSWER (volume solute/volume solution)x10^6
kilo- -ANSWER 10^3
deci- -ANSWER 10^-1
centi- -ANSWER 10^-2
milli- -ANSWER 10^-3
micro- -ANSWER 10^-6
nano- -ANSWER 10^-9
pico- -ANSWER 10^-12
femto- -ANSWER 10^-15
weight percent -ANSWER (grams analyte/grams sample)x100
ppt -ANSWER (grams analyte/grams sample)x10^3
ppt simplified -ANSWER gram analyte/liter solution
ppm simplified -ANSWER mg analyte/liter solution
ppb simplified -ANSWER micrograms analyte/liter solution
pptr simplified -ANSWER nanograms analyte/liter solution
buoyancy correction -ANSWER m=(m'(1-(air density/weight density)))/(1-(air
density/object density))
, accuracy -ANSWER closeness of the mean to the "true value"
precision -ANSWER reproducibility of individual measurements
Uncertainty in Addition/Subraction -ANSWER e=sqrt(ex1^2+ex2^2+ex3^2+...)
Uncertainty in Multiplication/Division -ANSWER
e=y*sqrt((ex1/x1)^2+(ex2/x2)^2+(ex3/x3)^2+...)
Significant Figures in Logarithms and antilogarithms -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) -ANSWER four significant figures, so you will
need four decimal places in your ANSWER
pH -ANSWER -log[H3O+]
[H3O+] -ANSWER 10^-pH
Absorbance -ANSWER -log(transmittance)
Random Error -ANSWER -repeated measurements are sometimes high and sometimes
low
-cannot be corrected for
Systematic Error -ANSWER -repeated measurements are usually always high or always
low
-can and should be corrected for
Relative uncertainty= -ANSWER absolute uncertainty/magnitude of measurement
68% of measurements in a Gaussian Curve will lie -ANSWER between the mean-1 and
the mean+1
Variance in standard deviation -ANSWER standard deviation squared
mean= -ANSWER true value +-time*standard deviation
T-test Case 1 -ANSWER measure sample of known composition
T-test case 2 -ANSWER compare replicate measurement of an unknown sample
T-test case 3 -ANSWER compare individual difference of an unknown sample
- two sets of data analyzed by both methods being used
With Detailed Questions And Correct
Answers||Latest Exam 2026-
2027||Already Graded A+
Molarity -ANSWER moles analyte/liter of solution
Volume Percent -ANSWER (volume solute/volume soution)x100
Volume ppm -ANSWER (volume solute/volume solution)x10^6
kilo- -ANSWER 10^3
deci- -ANSWER 10^-1
centi- -ANSWER 10^-2
milli- -ANSWER 10^-3
micro- -ANSWER 10^-6
nano- -ANSWER 10^-9
pico- -ANSWER 10^-12
femto- -ANSWER 10^-15
weight percent -ANSWER (grams analyte/grams sample)x100
ppt -ANSWER (grams analyte/grams sample)x10^3
ppt simplified -ANSWER gram analyte/liter solution
ppm simplified -ANSWER mg analyte/liter solution
ppb simplified -ANSWER micrograms analyte/liter solution
pptr simplified -ANSWER nanograms analyte/liter solution
buoyancy correction -ANSWER m=(m'(1-(air density/weight density)))/(1-(air
density/object density))
, accuracy -ANSWER closeness of the mean to the "true value"
precision -ANSWER reproducibility of individual measurements
Uncertainty in Addition/Subraction -ANSWER e=sqrt(ex1^2+ex2^2+ex3^2+...)
Uncertainty in Multiplication/Division -ANSWER
e=y*sqrt((ex1/x1)^2+(ex2/x2)^2+(ex3/x3)^2+...)
Significant Figures in Logarithms and antilogarithms -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) -ANSWER four significant figures, so you will
need four decimal places in your ANSWER
pH -ANSWER -log[H3O+]
[H3O+] -ANSWER 10^-pH
Absorbance -ANSWER -log(transmittance)
Random Error -ANSWER -repeated measurements are sometimes high and sometimes
low
-cannot be corrected for
Systematic Error -ANSWER -repeated measurements are usually always high or always
low
-can and should be corrected for
Relative uncertainty= -ANSWER absolute uncertainty/magnitude of measurement
68% of measurements in a Gaussian Curve will lie -ANSWER between the mean-1 and
the mean+1
Variance in standard deviation -ANSWER standard deviation squared
mean= -ANSWER true value +-time*standard deviation
T-test Case 1 -ANSWER measure sample of known composition
T-test case 2 -ANSWER compare replicate measurement of an unknown sample
T-test case 3 -ANSWER compare individual difference of an unknown sample
- two sets of data analyzed by both methods being used
