Which is an example of a chemical reaction

Compare and contrast physical changes with chemical changes.

What is the independent variable in this investigation? mass volume sample number substance density

16. in a reaction that has reached equilibrium, a. the forward and reverse reactions are occurring at the same rate. b. the reactants and products are in equal concentrations. c. the forward reaction has gone further than the reverse reaction. d. there are equal numbers of atoms on both sides of the equation. e. a, b, and d are correct.