Dilute potassium sulfide is added to a solution of barium chloride

The reaction q+r2=r2q is found to be first order in r2 and

Why are the trends and exceptions to the trends in ionization energy observed?

Maria wants to determine which type of disinfectant kills the most bacteria. which of the following is the best way for maria to determine this? a. ask ten different companies that make disinfectants which type is best. b. put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate. c. interview ten different people to determine which type of disinfectant they prefer. d. put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.