2. Quantitative analysis student Analytical analyzed an ore sample for its lead content and obtained a mean of 4.75% Pb for five measurements. If the certified true value is 4.50%, what is the (a) percent error? (b) percent accuracy?
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A: This Question is based upon Mossbauer Spectroscopy.
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A: Carboxylic acid contains -COOH group.
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A: As both compartment consists of same electrode. So it is concentration cell. E° = 0 Q = 0.106/0.608…
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- Suppose that in a gravimetric analysis, you forget to dry the filter crucibles before collecting precipitate. After filtering the product, you dry the product and crucible thoroughly before weighing them. Is the apparent mass of product always high or always low? Is the error in mass systematic or random?A volumetric calcium analysis on triplicate samples of the blood serum of a patient believed to be suffering from a hyperparathyroid condition produced the following data: mmol Ca/L = 3.55, 3.65, 3.14. What is the 95% confidence interval for the mean of the data, assuming(a) No prior information about the precision of the analysis?(b) s → σ = 0.056 mmol Ca/L?1. Explain both precision and accuracy as they pertain to chemical measurements. 2. Why would you use the method of standard addition to calibrate a measurement instead of a calibration curve?
- A new analytic instrument is capable of detecting picogram quantities of a chemi-cal substance. How many times more capable is this instrument than one that candetect nanogram quantities of the same chemical?A student failed to carry out all of the procedural steps when doing this experiment. Would the following procedural variations result in an experimentally determined %percent copper in brass? Would it be too low, too high or unaffected? Briefly justify your answer. a) the student did not use a dry beaker when obtaining the stock solution b) the student used a wet cuvette when determining the concentration of solution of unknown brass. c) the student used the wrong wavelength, 430nm, during the measurement of the absorbance of unknown brass solutionThe diameter of a copper (Cu) atom is roughly 1.3 x10-10 m. How many times can you divide evenly apiece of 10-cm copper wire until it is reduced to twoseparate copper atoms? (Assume there are appropriate tools for this procedure and that copper atoms arelined up in a straight line, in contact with each other.)Round off your answer to an integer.
- A cylindrical bar was found at the bottom of a storage tank of unknown composition. The material had a diameter of 8 mm, a length of 62 cm and a mass of 0.018 kg. What is the density of this material in g/mL? The volume of a cylinder is given by V = πr^2h.What are the similarities in random error and systematic error? In analytical method and graphical method?An impure sample of 0.1002 g benzoic acid underwent purification by recrystallization. A mass of 0.0542 g of white solid benzoic acid was obtained. Calculate the % purity of the initial sample. Show calculations and report the result with correct number of significant figures. Hi there please answer all parts clearly and concisely with legible hand writting, thank you!
- How many grams of Mn3O4 can be obtained from 1.00 g MnO2? how many ounces of Mn3O4 can be obtained from1.00 lb MnO2? Whatwt of Mn ore should be taken so that the percentage of MnO2 in the ore can be found by multiplying by 5 to the number of centigrams og Mn3O4it is also not 0.25Chemistry A suspension was prepared by mixing spherical gum grains with a density of 1.206 gcm-3 and a radius of 0.212 μm and water with a density of 0.999 gcm-3 at 15˚C. Since the number of particles determined microscopically at 5 μm and 35 μm heights from the base is 100 and 47, respectively, in the same time, calculate Avagadro's constant (g= 9.8 m s-2, μm= 10-6 m)