Which will provide the most direct measure of ph by measuring the hydrogen ion concentration of a solution?

a. ph meter
b. litmus paper
c. phenolphthalein
d. bromthymol blue

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.

Summarize possible ways in which phases of matter could combine to form a solution.

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins