What is the concentration of a solution (in parts per million) if 15 mg KNO3 are dissolved in water to make a total solution mass of 5.0 kg? A. 30 ppm of KNO3
B. 20 ppm of KNO3
C. 10 ppm of KNO3
D. 3 ppm of KNO3

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

How many atoms of mg are present in 97.22 grams of mg? 6.022 × 1023 2.408 × 1024 4.818 × 1024 5.855 × 1025

Drug abuse will not lead to physical and psychological dependence. true or false ?