(The roller coaster train slowly moved away from the station and over the top of a tall hill.
As the train began to rush down the hill, the riders felt like they were rising out of their seats! The train sped up until the track flattened out at the bottom of the hill.
At the bottom, the riders felt like they were being pushed down into their seats.)(FOR HELP)

As the train rushed down the hill, gravitational potential energy was converted into kinetic energy.
Which piece of evidence best supports the claim?

A) The people in the train felt like they were being pushed down at the bottom of the hill.
B) The speed of the train increased as the height of the train decreased.
C)The train kept moving when it reached the flat part of the track.

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 effect does a decrease in temperature have on the overall rate of a chemical reaction? a decrease in temperature decreases . the reaction rate will

Hey guys so i need to know what is _nh3+> nh4oh ~chemistry~