What is the percent nitrogen in each of the following compounds? (a) NaNO 3
(b) NH 4 C1
(c) N 2 H4
(d) N20

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b. slope c. benchmark d. index contour

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.