A boy and his dogs are running, The white dog has a mass of 10 kg The black dog has a mass of 20 kg. The boy has a mass of 40 kg They are all running at 3 m/s Kinetic Energy Versus Mass 1. Evaluate Expressions Determine the kinetic energy of the dogs and the boy. Record the kinetic energy for each. 250 200 150 2. Construct Graphs Graph the data to show how mass and kinetic energy are related 3. SEP Use Mathematics Suppose the smaller dog speeds up to 6 m/s. What is the kinetic energy of the dog now? How is kinetic energy related to speed? Kinetic energy (J) 100 50 0 0 10 40 50 20 30 Mass (kg)

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.

What is the mass of each element in a 324.8 sample of co2

You wish to prepare a buffer consisting of acetic acid and sodium acetate with a total acetic acetate plus acetate concentration of 250 mm and a ph of 5. what concentrations of acetic acid and sodium acetate should you use