1.ACS ANALYTICAL CHEMISTRY ASSESSMENT
WITH CORRECT QUESTIONS AND ANSWERS.
2. standard deviation (s) - ✔️✔️the square root of the variance
3. % relative standard deviation (%RSD) - ✔️✔️Standard deviation
divided by mean times 100
4. Grubbs test (Gcalc) - ✔️✔️|Questionable value - mean/ std dev|
5. If that is larger than the Gtable value then the value is thrown out.
Locate Gtable value based on number of values in data set.
6. Used to define outliers
7. z score - ✔️✔(️ x- xavg)/s
8. F Test - ✔️✔️used to compare precision
9. (s2)^2/(s1)^2 (should always be >1)
10. Use n-1 to find on table.
11. Fcalc> Ftable -- There is some noise or error
, 12. External standard - ✔️✔️use standard solutions spanning a
range of conc, measure response
13. Internal standard - ✔️✔️substance similar to analyte (ie
deuterated); used to normalize signal by reducing random error
14. Standard Addition - ✔️✔️ideal for analyzing sample in a
complex matrix; add known standard to constant amount of
sample; x-int =[sample]
15. Box car average - ✔️✔️minimizes distance between data
points and best fit line/ minimizes standard deviation
16. Limit of detection (LOD) - ✔️✔️3*std dev
17. Limit of quantitation (LOQ) - ✔️✔️10* std dev
18. sigma--> sigma* absorbs at - ✔️✔️~100nm
19. proteins absorb at - ✔️✔~️ 280 nm (bc of aromatic R
groups)
20. d-->d absorb - ✔️✔️visible light
WITH CORRECT QUESTIONS AND ANSWERS.
2. standard deviation (s) - ✔️✔️the square root of the variance
3. % relative standard deviation (%RSD) - ✔️✔️Standard deviation
divided by mean times 100
4. Grubbs test (Gcalc) - ✔️✔️|Questionable value - mean/ std dev|
5. If that is larger than the Gtable value then the value is thrown out.
Locate Gtable value based on number of values in data set.
6. Used to define outliers
7. z score - ✔️✔(️ x- xavg)/s
8. F Test - ✔️✔️used to compare precision
9. (s2)^2/(s1)^2 (should always be >1)
10. Use n-1 to find on table.
11. Fcalc> Ftable -- There is some noise or error
, 12. External standard - ✔️✔️use standard solutions spanning a
range of conc, measure response
13. Internal standard - ✔️✔️substance similar to analyte (ie
deuterated); used to normalize signal by reducing random error
14. Standard Addition - ✔️✔️ideal for analyzing sample in a
complex matrix; add known standard to constant amount of
sample; x-int =[sample]
15. Box car average - ✔️✔️minimizes distance between data
points and best fit line/ minimizes standard deviation
16. Limit of detection (LOD) - ✔️✔️3*std dev
17. Limit of quantitation (LOQ) - ✔️✔️10* std dev
18. sigma--> sigma* absorbs at - ✔️✔️~100nm
19. proteins absorb at - ✔️✔~️ 280 nm (bc of aromatic R
groups)
20. d-->d absorb - ✔️✔️visible light
