1. Sabrina was asked by a classmate why she would place hydrogen in the first column of the periodic tab le. Which of the following reasons could she give as a response?
1. Hydrogen combines with chlorine in the same atomic ratio as sodium.
II. Hydrogen is a gas at room temperature.
III. Hydrogen forms diatomic molecules.
А A
I and II
B. Oll and III
COI only
D. Ill only

The clouds are grey and ground is wet. a quantitative b qualitative

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.

Which statement describes james chadwick’s discovery.