Achemist weighed out 19.9 g of aluminum. calculate the number of moles of aluminum she weighed out.

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.

In which reaction is precipitation occurring?

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %