What is the empirical formula of the compound that contains 3.7% H,
44.4% C, and 51.9%N?

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?