At stp, how many molecules of nitrogen gas are in 22.4 l?
a. 6.022 × 10^22
b. 6.022 × 10^23
c. 6.022 × 10^24
d. 6.022 × 10^25

One or more substances changing into one or more substances is an example of a

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.

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled