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The chromium in a series of steel samples was determined by ICP emission spectroscopy. The spectrometer was calibrated with a series of standards containing 0.2.0, 4.0, 6.0, and 8.0 µg K2Cr2 O2 per milliliter. The instrument readings for these solutions were 3.1, 21.5, 40.9, 57.1, and 77.3. respectively, in arbitrary units.
(a) Plot the data using a spreadsheet.
(b) Find the equation for the regression line.
(c) Calculate standard deviations for the slope and the intercept of the line in (b).
(d) The following data were obtained for replicate 1.00-g samples of cement dissolved in HCI and diluted to 100.0 mL after neutralization.
Calculate the percentage of Cr2O3 in each sample. What are the absolute and relative standard deviations for the average of each determination?
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If you look at a reaction for an esterification reaction, you cannot tell where the oxygen comes from (acid or alcohol). Draw the mechanism of this reaction, and devise an experiment using the mechanism and O18 (O18 isotope) to help prove unequivo..
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You determine the mass of a clean dry beaker and found that it was 58.1884 g. You filled water up to the mark and transferred this to the beaker and found that the new mass was 82.9658 g. What is the actual volume of the pipet?
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A bottle contains 225 mL of insulin at a concentration of 50.0 mg/mL. What is the total mass of insulin in the bottle?
A human piece of pottery is dated 16750 years old by using carbon-14. how many half lives have passed since the pottery was made?
A 1.724 M solution of a compound in water has a density of 1.281 g/mL at 20°C. The compound has a molar mass of 62.30 g/mol.
Explain how bacteria are intimately involved in the generation of acidic mine waters.
A sample of neon gas occupies a volume of 2.8 L at 1.8 atm. What would it's volume be at 1.2 atm
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