Recrystallization Step: The procedure asks for using equal amount by mass of the crude product and the recrystallization solvent, 95% ethanol. Suppose you use 1.2g of product, how many mL of 95% ethanol would you add? Write the answer as a number (without units) with 3 significant figures (e. g. 2.15). Density of 95% ethanol = 0.86 g/mL

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 is not a good technique for managing used oil? a) have specific, labeled catch pans available for technicians who are collecting oil b) spills in your shop and any releases on pavement or outside should be poured down a drain c) do not use oil containers for antifreeze or other non-similar fluids d) be prepared for oil spills with the proper absorbents

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?