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Traces of toxic, man-made hexachlorohexanes in North Sea sediments were extracted by a known process and by a new procedure, and measured by chromatography. Is the mean concentration found by procedure A significantly different from that of the conventional procedure?
Method Concentration Found (pg/g) Standard Dev.(pg/g) Number of replications Conventional 34.4 3.6 6Procedure A 42.9 1.2 6
write mechanisms for the following reactions, which are used in chemical tests and derivative preparations: (a) the reaction of butanal with 2,4 dinitrophenylhydrazine reagent.
How are the opposing pathways of glycolysis and gluconeogenesis prevented from extensive
Solid strontium hydroxide is added to a solution of nitric acid. How many moles of strontium hydroxide are needed to react completely with 500. mL of 0.40 M nitric acid?
Consider a waterbody at that temperature containing 7.0 mg l-1 oxygen. By photosynthesis, 1.5 mg of carbon (as carbon dioxide) is converted to biomass (CH3O) during a single hot day.
What is the purpose of massing the watch glass and Buchner funnel filter paper prior
Calculate the change in internal energy if a) The specific heat is assumed constant at its room-temperature value.
Fluorine reacts with oxygen to yield oxygen difluoride. 2 F2(g) + O2(g) 2 OF2(g) What is the value of K if the following concentrations are found at equilibrium: [O2] = 0.200 mol/L, [F2] = 0.0100 mol/L, and [OF2] = 0.0633 mol/L.
A sample of water is collected over water at a total pressure of 616.8 mmHg at 300 C. The vapor pressure of water at 300 C is 31.8 mmHg.
it absorbs 32.60 kj of heat from its surroundings. what is its final temperature in C (specific heat .9930 J g C for Al)
Suppose HI at 5.00 10^-1 M, H2 at 1.00 x 10^-2 M, and I2 at 5.00 x 10^-3 M are mixed in a 5.0 L container. Calculate all concentrations at equilibruim.
The flask was then shaken until the solution was uniform. A 40.0-mL sample of this glucose solution was diluted to 0.500 L. How many grams of glucose are in 100 mL. of the final solution?
An unknown gas sample was dissolved in water at 25°C, producing a solution with a concentration of 4.7 x 10-4 M at 522 mm Hg. What is the Henry's law constant for the unknown gas
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