An electric generator uses a force, such as water power, to spin a turbine causing a shaft to spin magnets past copper wire coils allowing mechanical energy to be transformed into electrical energy.

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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.

Asolution of naoh has a concentration of 25.00% by mass. what mass of naoh is present in 0.250 g of this solution? use the periodic table in the toolbar if needed. 0.0625 g what mass of naoh must be added to the solution to increase the concentration to 30.00% by mass? g

(05.04 mc) the table below shows the set of traits in four different beetle populations. traits in population population traits 1 brown-colored beetles, pesticide-resistant gene present 2 green-colored beetles, pesticide-resistant gene absent 3 green and brown–colored beetles, pesticide-resistant gene absent 4 green and brown−colored beetles, pesticide-resistant gene present which population of beetles is most likely to become extinct when the existing conditions change? (4 points) select one: a. 1 b. 2 c. 3 d. 4