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Question1 : If a sample of water from a pond is to be analyzed for whatever chemicals it may contain (including organic compounds and metal containing species), give a very brief, but specific description of the protocol that would be best used, including what instrument(s) should be involved (choosing only from NMR and/or any chromatographic systems), and any specific accessories that might be needed (e.g. transducers/detectors, sample introduction system, etc.) as well as how the sample should be prepared for analysis, any interferences expected and how to overcome them, etc.
Question 2: In most instrumental or analytical methods, use of an Internal Standard is considered the least desirable approach for calibrating the method. However, it is a very important technique for Chromatographic methods, especially GC. Why is this true?
Questoin 3: The terms SCOT, WCOT, & PLOT are frequently used to describe types of GC columns. Specifically how do these columns differ from "Packed" columns in their structure and function and why are they an improvement over packed columns? (Refer to Van Deemter theory.)
Determine osmolarity of solution when 25.0 grams of aluminum chloride dissolves in 2.50 liters of H2O.
10mL of 0.1M HNO2 (nitrous acid, ka=4.0x10^-4)is titrated with a .01M KOH solution. After 10mL of the KOH solution is added, what will be the pH in the titration flask?
How many joules of heat are required to heat 143 g of aluminum from 55.0 oC to 66.5oC?
Determine how many grams of aluminum hydroxide will get from 18.2g of aluminum sulfide and determine the density of this newly minted penny
Indicate whether HC4H7O2 behaves as an acid or a base, and support your choice with a brief explanation.
at 90C the foll equilibrium is established, H2(g) + S(s)=H2S(g) K=6.8*10-2 If 0.2 mol of hydrogen and 1 mol of sulphur are heated to 90C in a 1L vessel.
An environmental engineer analyzes a sample of air contaminated with sulfur dioxide. To a 500. mL sample of air at 700. torr and 38°C, she adds 20.00 mL of 0.01017 M aqueous iodine, which reacts as follows:
Explain The Chemistry of Food Composition, find the nutritional values/info in food from USDA Nutrient Data Laboratory?
Calculate the average atomic made of boron which has 2 isotopes. Boron-10 has an abundance of 19.9% and boron-11 has an abundance of 80.1%.
A solution of ethanol (C2H6O) in water is sometimes used as s disinfectant. 1.00 L of this solution contains 553 g or ethanol and 335 g of water. What is the mole fraction of ethanol in this solution.
How much heat is required to raise the temperature of 73.5 of water from its melting point to its boiling point?
a 5.0 dm3 sample of oxygen at a pressur of 200 kpa and 2.0 dm3 sample of nitrogen at a pressure of 500 kpa are introduced into a 2.5 dm3 vessel. what is the total pressure in the vessel?
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