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- Hydrocarbons in the cab of an automobile were measured during trips on the New Jersey Turnpike and trips through the Lincoln Tunnel connecting New York and New Jersey. The total concentrations ( ± standard deviation) of m- and p-xylene wereTurnpike: 31.4 ± 27.0 μg/m3 (32 measurements)Tunnel: 54.9 ± 29.8 μg/m3 (32 measurements)Do these results different at the 95% confidence level?You are developing a Ca detection method for a graphite furnace AA instrument. Your analysis of ten blank samples gives a standard deviation of 0.265 ppb. To establish your limit of detection (LOD), what concentration of Ca should be spiked into your blanks?4.Determination of hardness by clark's test
- The most common test used for the measurement of hormones is: A) immunoassay B) colorimetric spectrophotometry C) high performance liquid chromatography D) ion selective electrodeGlass is a notorious source of metal ion contamination. Three glass bottles were crushed and sieved to collect 1-mm pieces.8 To see how much Al31 could be extracted, 200 mL of a 0.05 M solution of the metal-binding compound EDTA were stirred with 0.50 g of ,1-mm glass particles in a polyethylene flask. The Al content of the solution after 2 months was 5.2 mM. The total Al content of the glass, measured after completely dissolving some glass in 48 wt% HF with microwave heating, was 0.80 wt%. What fraction of the Al was extracted from glass by EDTA?A student performs a separation by TLC on a silica gel platee that results in three spots. A red spot is measured 23 mm away from the original sample spot, a blue spot is 42 mm away, and a yellow spot is 49 mm away. the distance from the original spot to where the solvent stopped is 55 mm. a) calculate the Rf value for each componenet in the mixture (show work and report th correct number of significant figures) b) the silica gel plate is polar. rank the three componenets in the mixture from lowest to highest polarity. Explain your answer.
- what is the specific gravity of a substance that displaeces 1.2ml and has a mass of 5.021g5. Permanganatometry is used to quantify?A) Iron (II) sulfateB) Zinc sulfateC) Silver nitrateD) Basic bismuth nitrateE) Copper sulfateQuestions 11 and 12 refer to the same set of absorbance readings that were taken on metal-EDTA complexes in a different solution known to contain cobalt and nickel. The cuvette width is 1.00 cm. Given the following, what is the concentration of Co2+ in solution? (Four decimal places) Given the following, what is the concentration of Ni2+ in solution? (Four decimal places)
- choices are: permanganate test, lucas test, ferric chloride, tollen's, iodoform, 2,4-DNP, molisch, benedict'sFind the connection among the words below and choose the letter of the word which is different.* 1. A. electrical field B. loading dye C. buffer D. gel density 2. A. agarose powder B. buffer C. loading dye D. Ethidium bromideIm completely lost
