Diffusion in a polycrystalline material is generally faster along a free surface than through the grain interior because (a) the effective vacancy concentration is generally greater on the surface (b) concentration gradients (c) the activation energy for diffusion is usually greater on the surface (d) all of the above generally greater on the surface are

Answerstrong acids and bases completely dissociate in water.this is how strong acids and bases are defined. they will ionize 100% in solution, making a non-reversible reaction

In reversible reaction chemistry equilibrium is attained when the forward and reverse reactions are taking place at the same rate, thus, the concentrations of reactants and products remain the same. a reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back. in irreversible reactions on the other hand, the reactants react to form the products, which cannot revert back into reactants.