Analytical Chemistry Final- ACS Exam (100% Correct answers)
ppm correct answers (grams analyte/grams sample)x10^6
Molarity correct answers moles analyte/liter of solution
Volume Percent correct answers (volume solute/volume soution)x100
Volume ppm correct answers (volume solute/volume solution)x10^6
kilo- correct answers 10^3
deci- correct answers 10^-1
centi- correct answers 10^-2
milli- correct answers 10^-3
micro- correct answers 10^-6
nano- correct answers 10^-9
pico- correct answers 10^-12
femto- correct answers 10^-15
weight percent correct answers (grams analyte/grams sample)x100
ppt correct answers (grams analyte/grams sample)x10^3
ppt simplified correct answers gram analyte/liter solution
ppm simplified correct answers mg analyte/liter solution
ppb simplified correct answers micrograms analyte/liter solution
pptr simplified correct answers nanograms analyte/liter solution
buoyancy correction correct answers m=(m'(1-(air density/weight density)))/(1-(air density/object density))
accuracy correct answers closeness of the mean to the "true value"
precision correct answers reproducibility of individual measurements Uncertainty in Addition/Subraction correct answers e=sqrt(ex1^2+ex2^2+ex3^2+...)
Uncertainty in Multiplication/Division correct answers e=y*sqrt((ex1/x1)^2+(ex2/x2)^2+(ex3/x3)^2+...)
Significant Figures in Logarithms and antilogarithms correct answers 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 answers four significant figures, so you will need four decimal places in your answer
pH correct answers -log[H3O+]
[H3O+] correct answers 10^-pH
Absorbance correct answers -log(transmittance)
Random Error correct answers -repeated measurements are sometimes high and sometimes low
-cannot be corrected for
Systematic Error correct answers -repeated measurements are usually always high or always low
-can and should be corrected for
Relative uncertainty= correct answers absolute uncertainty/magnitude of measurement
68% of measurements in a Gaussian Curve will lie correct answers between the mean-1 and the mean+1
Variance in standard deviation correct answers standard deviation squared
mean= correct answers true value +-time*standard deviation
T-test Case 1 correct answers measure sample of known composition
T-test case 2 correct answers compare replicate measurement of an unknown sample
T-test case 3 correct answers compare individual difference of an unknown sample
- two sets of data analyzed by both methods being used
T-test case 1 equation correct answers true value= mean (+-) (time*standard deviation)/sqrt(number of measurements))
T-test case 1 Tcalc= correct answers (sqrt(n)Iknown value-calculated meanI)/standard deviation
For Case 1:
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