If we recorded the mass before and after for the "other" chemical change experiments, they would appear to violate the law of conservation of mass. Each
experiment would show mass was "lost” during the chemical change. Explain
why.

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.

Helium decays to form lithium. which equation correctly describes this decay?

What methods could you use to solubilize calcium carbonate