CHEM 210 Final Exam Questions And Answers. Verified and Updated.
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Course
Chem 210
Institution
Chem 210
CHEM 210 Final Exam Questions And
Answers. Verified and Updated.
If the p-value is greater than 0.1, we generally conclude the data are consistent with the null
hypothesis - answertrue
what is the best way to characterize the random error present in a measurement? -
answertake replicate measur...
EXAM STUDY MATERIALS July 24, 2024 1:33:58 PM CHEM 210 Final Exam Questions And Answers. Verified and Updated. If the p -value is greater than 0.1, we generally conclude the data are consistent with the null hypothesis - answer✔✔true what is the best way to characterize the random error present in a measurement? - answer✔✔take replicate measurements of your analytes and using the standard deviation and a t -
table specify an error bar with a confidence limit statistical interference assesses whether an observed phenomenon in the data can reasonably be attributed to chance or not - answer✔✔true suppose we collected a sample size n = 100 from some population and used the data to calculate a 95% confidence interval for the population mean. now suppose we are going to increase the sample size to n = 300. k eeping all else constant, which of the following would we expect to occur as a result of increasing the sample size? - answer✔✔(1) the standard error would decrease, (2) the margin of error would decrease in designing a clinical trial where each subject re ceives both a placebo and a proposed treatment, what statistical test would be most appropriate? - answer✔✔paired t -test an atomic absorption analysis is to be done on the calcium in a sample of powdered milk. a 12.55 gram sample of the powder is wet ashed in nitric acid and diluted to 50.00 mL with distilled water. a 1.00 mL aliquot of this is transferred to a 50.00 mL solution using EDTA. using a wavelength of 422.6 nm in an atomic absorption experiment, this diluted sample showed an absorbance of 0.375. a standard calcium sample (treated the same way) with a known concentration of 20.0 ppm provided an absorbance of 0.859. what is the ppm of calcium in the powdered milk? - answer✔✔437 ppm in a 3 step serial dilution: the first dilution is 1/10, the second dilution is 1/5, and the third dilution is 1/4. what is the total dilution factor of this 3 step serial dilution procedure? - answer✔✔200 a solution was prepared by mixing 10.00 mL of unknown (X) with 5.00 mL of standard (S) containing 8.24 ug/mL and dilut ing the mixture to 50.0 mL. the measured signal areas from an atomic absorption spectrometer of X:S was 1.690:1.000. in a separate experiment in which the concentrations of X and S were equal, the measured signal areas of X:S was 0.930:1.000. the concentra tion of X in the unknown is? - answer✔✔7.49 ug/mL EXAM STUDY MATERIALS July 24, 2024 1:33:58 PM you set up a 10 tube Minimum Inhibitory Concentration test where the concentration of the antibiotic in each tube is a 1:2 dilution of the previous tube. if the concentration of the antibiotic tube 1 is 320 0 ug/mL, what is the concentration of the antibiotic in tube 6? - answer✔✔100 ug/mL solution: (1/2)^5 x 3200 = 100 to measure the Ca in breakfast cereal, 0.561 g of crushed Cheerios was digested at 600*C in air for 2 hours. the residue was dissolved in 6 M HCl, quantitatively transferred to a volumetric flask and dilution to 100.0 mL. then 5.00 -mL aliquots were transferred to 50.0 -mL volumetric flasks. each was treated with standard Ca2+ ion solution (20.0 ppm), diluted to volume with H2O, and analyzed by flame atomic absorption. a graph was constructed from the readings. use this graph to determine the wt% Ca in Cheerios. - answer✔✔0.4% the pH of the titration solution at the equivalence point is 9.45. this is consistent with titration of a weak acid with strong base. - answer✔✔true how many liters of a 2 M Ba(OH)2 are needed to titrate a 4 L solution of 6 M H3PO4? - answer✔✔18 L solution: (4 x X) = (4 x 18) the charge balance equation for a solution containing H2O, H+, OH -, Ca2+, K+, C2H5OH, CrO4(2 -), and Cl- is: - answer✔✔[H+] + 2[Ca2+] + [K+] = [OH -] + [Cl -] + 2[CrO4(2 -)] what is the [H3O+] of a 2 M aqueous solution of a weak acid HXO2 with Ka = 3.2 x 10^ -5? - answer✔✔8.0 x 10^ -3 M glutamic acid is an amino acid consisting of 2 carboxylic acid functional groups and an amine functional group. pKas are listed as 2.19, 4.25, and 9.67. at pH 7, the charge on the glutamic molecule is? - answer✔✔-1 which of the following is NOT a characteristic of an amphoteric species? - answer✔✔amphoteric species are always n onpolar all of the following are TRUE for activities and activity coefficients, except... - answer✔✔as ionic strength increases, the value of the activity coefficient increases glutamic acid is an amino acid consisting of 2 carboxylic acid functional groups and an amine functional group. pkas are listed as 2.19, 4.25, and 9.67. the approximate pH of 0.025 M HL - is? - answer✔✔6.96
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