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How many calories are require to convert 125g of water at 75.0 Celsius to steam at 100.0 Celsius? (heat of vaporization of H2O = 540.0/ H20(LIQUID) = 1.00 / steam = 0.47
Explain how FeBr3 assists the reaction. Br2 dissolves in a number of solvents, but we preferentially use glacial acetic acid.
An overly efficient student simultaneously prepared two titration mixtures, consisting of diluted bleaching solution, KI solution, and HCI solution.
The masses of the unknown and the solvent (water) were determinded, and the unknown completely dissolved in the water. Just before the jacketed test tube containing the unknown solution was placed in the ice-salt water bath
Discuss the differences observed in the IR and NMR spectra of 3-nitrophthal-hydrazide and luminol that are consistent with reduction
You are given 100g agarose (which makes a gel when dissovled in boiling water) and 100 ml buffer. Show how you would prepare 50 ml of a 1.2% agarose gel. weight and volume do not add up
What are the concentrations of HOAC and OAC- in a 0.2M acetate buffer pH 5.0? The Ka for acetic acid is 1.70 X 10-5 (pKa = 4.77).
the resulting mixture has (pb2+)i=1.0x10^-3M, (so4^-2)i=1.0x10^-4 for pbso4 ksp=1.3x10^-8. compare qsp to ksp and decide whether a precipitate will form.
Calculate the pH of the 0.20 M NH3/0.24 M NH4Cl buffer. B)What is the pH of the buffer after the addition of 10.0 mL of 0.10 M HCl to 55.0 mL of the buffer?
The solutions mixed together are 53.6 mL of 0.129 M hydrochloric acid, 104.1 mL of 0.215 M of nitric acid, 501.5 mL of 0.0126 M calcium hydroxide, and 201.0 mL of 0.122 M rubidium hydroxide. Did the acids and bases exactly neutralize each other?
A chemist places 1.7823 g of Na2SO4 in a 100 mL volumetric flask and adds water to the mark. She then pipets 10 mL of the resulting solution into a 50 mL volumetric flask and adds water to the mark and mixes to make a solution.
A young child grows rapidly, with high levels of cell division and high energy requirements. If you were planning the child's diet, which food groups would you emphasize, and why? Which good groups would you deemphasize, and why?
Using the inverse square law of radiation, what Geiger counter reading would you get for a radioactive material when you are 3 feet from the source (assume an initial reading of 6300 R at a distance of 1 foot from the source)
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