25.0 grams of magnesium chloride is dissolved in 200.0 grams of solution. What is the concentration of the solution in parts per million (ppm)? In parts per billion (ppb)?

What semimetal can form four single covalent bonds.

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg