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Explain why do you see distinct lines when metal salts are burned however see a continuous spectrum when observing sunlight or light from an overhead projector?
How many grams of dry NH4Cl need to be added to 1.50 L of a 0.500 M solution of ammonia, NH3,to prepare a buffer solution that has a pH of 8.79? Kb for ammonia is 1.8*10^-5.
express the work of isothermal reversible expansion of a van der waals gas in reduced variables and find a definition
A common way to determine CEC of a soil is to saturate the CEC with NH4+ ions. If a soil holds 286mg
Determine that the other stream leaving the evaporator (stream 4) is 100% H2O. Define the product out of the crystallizer (stream 6) contains 4% H2O (by weight).
A sample of calcium carbonate [CaCO3 (s)] absorbs 45.5 J of heat, upon which the temperature of the sample increases from 21.1C to 28.5C. If the specific heat of calcium carbonate is 0.82 J/g-K, what is the mass (in grams) of the sample
Subtilisin (Mr 27600) is a bacterial protease that can catalyze hydrolysis of certain amino acid esters and amides. Subtilisin does have a problem, in that it becomes inactivated by oxidation of a methionine Met-222. Subtilisin mutant with Cys rep..
ethyl acetate:petroleum ether was used to elute the chlesterol before dichloromethane
In 0.04 M NaOH at 20*C, the decomposition of H2O2 and O2 is first order. If the half-life is 654 minutes, what would be the concentration after 100.00 minutes of a solution initially at 0.200 M
A 500-mL volumetric flask containing 0.434 M KCl is emptied and allowed to drain briefly, leaving 1.14 mL of liquid in the flask. The flask is then rinsed by adding 87.5 mL of distilled water and is then used to prepare a standard solution of KNO3..
Calcium phosphide reacts with water according to the equation. Using 84.0g of Ca ?P? and 36.0g of H?O, What volume of PH? will be produced at 273 K and a pressure of 1520 torr? Ca?P? + H?O --> Ca(OH)? + PH?
A copper,(Cu(s) , electrode is immersed in a solution that is 1.00 M in ammonia,NH3 , and 1.00M in tetraamminecopper(II),[Cu(NH3)4]^2+ . If a standard hydrogen electrode is used as the cathode,
A 195mg sample of a non-electrolyte isolated from throat lozenges was dissolved in enough water to make 10.0mL of solution at 25 degrees Celsius. The osmotic pressure of the resulting solution was 4.83atm. Calculate the molar mass of the compound.
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