5. A solid mass of 20 g is mixed with 30 g of solution in an open container with a mass of 50 g. When the two are mixed, they fizz. The mass of the entire system is taken after the experiment is completed and found to be 95 g. Does this obey the law of conservation of mass? Why or why not? How would you explain what happened?

Atank contains 240 liters of fluid in which 10 grams of salt is dissolved. brine containing 1 gram of salt per liter is then pumped into the tank at a rate of 6 l/min; the well-mixed solution is pumped out at the same rate. find the number a(t) of grams of salt in the tank at time t.

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.

Enzymes affect the reactions in living cells by changing the