One of the many isotopes used in cancer treatment is 79198Au, with a half-life of 2.70 d. Determine the mass of this isotope that is required to give an activity of 285 Ci.

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?