(Oop well I think JcLocal34 has disconnected from :( after his last question) What is true about atoms?
A. They are ALWAYS made from other compounds
B. They are ALWAYS motionless
C. They can combine to form other substances
D. They cannot combine to form other substances

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

Define a is a tiny pavket of energy

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.