Why is actual yield less than theoretical.

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

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.

Answer explain why it is not possible to deduce a complete order of reactivity.