A crystal is placed in a graduated cylinder containing 27 ml of water. the water rises to 60ml. what is the volume of the crystal?

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.

Which of the following substances is the most soluble in water? a. sodium chloride b. methane c. bromine d. carbon

One student said that the investigation was not valid (a fair test). write a plan for the investigation that includes improvements to the method and apparatus