1. Construct a similar electron-dot expression for the change that occurred during Investigating Malter B.12 (page 71) when each of these events took place : a)An atom of zinc, Zn, was converted to a Zn^ 2+ ion (Hint: Zn has two readily removable electrons.) b)A silver ion Ag^ + converted to a metallic silver atom . Ag * (s) .

You may expect bonds between two atoms which each have n covalent lonic metallic hydrogen

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A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.