What is a reactant? A- Solid particles that have been separated from a solution

B- A substance that has the ability to be dissolved by a solvent

C- A mixture in which a solid and a liquid or two liquids are mixed occurs

D- The substance present before a chemical reaction occurs

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.