10 points

How many elements are PbSO4?

How many atoms are there in 5.70 mol of mg

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