Car tires are sometimes filled with pure nitrogen (N2). If a tire has 2.97x10^21 molecules of N2 in it, how many grams of nitrogen would that be?

One way that radioactive waste is treated is by burying it in repositories. the repositories are found only in states with very low populations. true or false? a. trueb. false(also i meant to put high school but it put down middle school instead)

The reactions of photosynthesis occur in the of plant cell? a.mitochondria. b. lysosomes. c. chloroplasts. d. chlorophyll

Which method would be best to separate a mixture of sand and gravel