Determine whether the following statements are true or false. If false, explain why.

(a) In an equilibrium reaction, the reverse reaction begins only when all reactants have been converted to products.

(b) The equilibrium concentrations will be the same whether one starts with pure reactants or pure products.

(c) The rates of the forward and reverse reactions are the same at equilibrium.

(d) If the Gibbs free energy is greater than the standard Gibbs free energy of reaction, the reaction proceeds forward to equilibrium.