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Why is the identity of an element determined by the number of protons in its nucleus? Why can't the identity be determined by the number of neutrons or the number of electrons?
A 1.8M solution of 65 mL is diluted to a volume of 248 mili litres. A portion of that solutions 124-mili litres is diluted using water of 137 mili litres. Determine the final concentration of this solution?
A graduated cylinder contains 31.0 of water. What is the new water level after 38.0 of silver metal is submerged in the water?
Prove that if the atmosphere has a lower partial pressure of water than the solid-vapor pressure
Use the appropriate relationships from the chapter of electrons in Atoms to determine the wavelength of the line in the emission spectrum of He+ produced by an electron transition from n=5 to n=2
The net charge of a polypeptide at a particular pH can be determined by considering the pK value for each ionizable group in the protein
Calcium and nitrogen react to form calcium nitride; 3Ca(s)+N2(g)-->Ca3N2(s). If 56.6 g of calcium is mixed with nitrogen gas and 32.4 g of calcium nitride is produced, what is the percent yield of the reaction
If 4.174 atm of COBr2 in a 1.000 L reaction vessel at 425K partially decomposed such that the equalibrium mixture had a total equalibrium pressure of 5.51 atm.
Solid calcium oxide reacts with solid ammonium chloride to produce gaseous ammonia, gaseous water, and solid calcium chloride. If 112 grams of calcium oxide were mixed with 224 grams of ammonium chloride
A 0.5078g sample of impure nitrobenzene was treated with 1.044g of tin. when the reaction was complete, the residual tin was found to weight 0.338g. Calculate the percentage of nitrobenzene in the sample.
How do you understand the following terms: "carbon loading" and "bonding density" for RP HPLC packing material? Which one is the most important for HPLC? Explain.
Calculate the mass of nitrogen dissolved at room temperature in an 96.0 home aquarium. Assume a total pressure of 1.0 and a mole fraction for nitrogen of 0.78.
Calculate the pH at the equivalence point for the titration of 0.170 M methylamine (CH3NH2) with 0.170 M HCl. The Kb of methylamine is 5.0× 10-4.
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