A student wanets to use toilet paper to show the distance of one Astronomonical Unit, or the distance from the sun to the earth. They decided to use a scale factor of 1 square of toilet paper = 100,00km. How many rolls of toilet paper will the student need, if each roll of toilet paper has 500 sqares?

Describe in detail the melting point behavior of the 80: 20 benzoic acid-mandelic acid mixture

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.

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland