If you were asked to convert 25 hg to the unit cg, which of the following would be the first fraction used in the conversion?

How does the motion of particles in a gas change as the gas cools

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

How is the atomic number of a nucleus changed by alpha decay