ANALYTICAL CHEMISTRY FINAL- ACS
EXAM CORRECT 100%
ppm - ANSWER(grams analyte/grams sample)x10^6
Molarity - ANSWERmoles analyte/liter of solution
Volume Percent - ANSWER(volume solute/volume soution)x100
Volume ppm - ANSWER(volume solute/volume solution)x10^6
kilo- - ANSWER10^3
deci- - ANSWER10^-1
centi- - ANSWER10^-2
milli- - ANSWER10^-3
micro- - ANSWER10^-6
nano- - ANSWER10^-9
pico- - ANSWER10^-12
femto- - ANSWER10^-15
weight percent - ANSWER(grams analyte/grams sample)x100
ppt - ANSWER(grams analyte/grams sample)x10^3
ppt simplified - ANSWERgram analyte/liter solution
ppm simplified - ANSWERmg analyte/liter solution
ppb simplified - ANSWERmicrograms analyte/liter solution
pptr simplified - ANSWERnanograms analyte/liter solution
buoyancy correction - ANSWERm=(m'(1-(air density/weight density)))/(1-(air
density/object density))
accuracy - ANSWERcloseness of the mean to the "true value"
, precision - ANSWERreproducibility of individual measurements
Uncertainty in Addition/Subraction - ANSWERe=sqrt(ex1^2+ex2^2+ex3^2+...)
Uncertainty in Multiplication/Division -
ANSWERe=y*sqrt((ex1/x1)^2+(ex2/x2)^2+(ex3/x3)^2+...)
Significant Figures in Logarithms and antilogarithms - ANSWERthe number of
significant figures in the log should equal the number of digits in the mantissa
How many significant figures in log(205.5) - ANSWERfour significant figures, so you will
need four decimal places in your answer
pH - ANSWER-log[H3O+]
[H3O+] - ANSWER10^-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= - ANSWERabsolute uncertainty/magnitude of measurement
68% of measurements in a Gaussian Curve will lie - ANSWERbetween the mean-1 and
the mean+1
Variance in standard deviation - ANSWERstandard deviation squared
mean= - ANSWERtrue value +-time*standard deviation
T-test Case 1 - ANSWERmeasure sample of known composition
T-test case 2 - ANSWERcompare replicate measurement of an unknown sample
T-test case 3 - ANSWERcompare individual difference of an unknown sample
- two sets of data analyzed by both methods being used
T-test case 1 equation - ANSWERtrue value= mean (+-) (time*standard
deviation)/sqrt(number of measurements))
EXAM CORRECT 100%
ppm - ANSWER(grams analyte/grams sample)x10^6
Molarity - ANSWERmoles analyte/liter of solution
Volume Percent - ANSWER(volume solute/volume soution)x100
Volume ppm - ANSWER(volume solute/volume solution)x10^6
kilo- - ANSWER10^3
deci- - ANSWER10^-1
centi- - ANSWER10^-2
milli- - ANSWER10^-3
micro- - ANSWER10^-6
nano- - ANSWER10^-9
pico- - ANSWER10^-12
femto- - ANSWER10^-15
weight percent - ANSWER(grams analyte/grams sample)x100
ppt - ANSWER(grams analyte/grams sample)x10^3
ppt simplified - ANSWERgram analyte/liter solution
ppm simplified - ANSWERmg analyte/liter solution
ppb simplified - ANSWERmicrograms analyte/liter solution
pptr simplified - ANSWERnanograms analyte/liter solution
buoyancy correction - ANSWERm=(m'(1-(air density/weight density)))/(1-(air
density/object density))
accuracy - ANSWERcloseness of the mean to the "true value"
, precision - ANSWERreproducibility of individual measurements
Uncertainty in Addition/Subraction - ANSWERe=sqrt(ex1^2+ex2^2+ex3^2+...)
Uncertainty in Multiplication/Division -
ANSWERe=y*sqrt((ex1/x1)^2+(ex2/x2)^2+(ex3/x3)^2+...)
Significant Figures in Logarithms and antilogarithms - ANSWERthe number of
significant figures in the log should equal the number of digits in the mantissa
How many significant figures in log(205.5) - ANSWERfour significant figures, so you will
need four decimal places in your answer
pH - ANSWER-log[H3O+]
[H3O+] - ANSWER10^-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= - ANSWERabsolute uncertainty/magnitude of measurement
68% of measurements in a Gaussian Curve will lie - ANSWERbetween the mean-1 and
the mean+1
Variance in standard deviation - ANSWERstandard deviation squared
mean= - ANSWERtrue value +-time*standard deviation
T-test Case 1 - ANSWERmeasure sample of known composition
T-test case 2 - ANSWERcompare replicate measurement of an unknown sample
T-test case 3 - ANSWERcompare individual difference of an unknown sample
- two sets of data analyzed by both methods being used
T-test case 1 equation - ANSWERtrue value= mean (+-) (time*standard
deviation)/sqrt(number of measurements))
