A case of paper has a mass of 2000g. a case of paper contains 10 reams of paper. one ream of paper is 500 sheets. what is the mass, in grams, of 50 sheets of paper

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.