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A student added calcium ion, Ca +2 to an aqueous solution as well as observed formation of a precipitate. Addition of HNO 3 had no effect on the precipitate. Explain what anion was present in the original solution?
How many grams of propane must be burned to heat 180g of water from -15 degrees Celcius
In a common protein analysis, a dye binds to the protein and the color of the dye changes from brown to blue. The intensity of the blue color is proportional to the amount of protein present.
When you made your graphs of Percent Transmittance vs. Concentration and Absorbance vs. Concentration, you include data points for 100%T at 0 concentration, and 0 Absorbance at 0 concentration. Why are these valid data points
Explain what volume of chlorine gas at 27 degrees Celsius, 812 mmHg, is needed to react with an excess of CS2(l) so that 5.00 kj of heat is evolved
The vapor pressure of water at 25deg C is 23.8 torr. Determine the mass of glucose (MolarMass=180g/mol) needed to add 500g of water to change the vapor pressure to 23.3 torr.
gas cylinder a has a volume of 48.2l and contains n2g at 8.35 atm at 25 degrees c. gas cylinder b of unknown volume
Calcium carbonate and sand mixture with weight of 4 grams is reacted with excees of HCl results in the production of carbon dioxide then find out the percent of calcium carbonate in the original mixture?
Draw out the Lewis structures for H2CO3, HCO3-, and CO32-. Then determine the maximum number of equivalent resonance structures for each species. Note that carbon is the central atom in all three cases
h2s and h2o have similar structures and their central atoms belond to the same group. why is h2s a gas at room
Calculate the work in kilojoules done during a synthesis of ammonia in which the volume contracts from 8.8L to 4.3L at a constant external pressure of 46 atm
How does temperature affect the rate of biodegradation. How does temperature affect BOD5. How does temperature affect the ultimate BOD.
Four wavelengths of light are each quantized to excite electrons of a given atom to a particular higher energy shell. Assign wavelengths of 496nm, 356nm, 701nm, and 591nm
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