For most substances, the solid is more dense than the liquid. Sketch the phase diagram for such a substance, being sure to have the solid-liquid equilibrium line slope in the correct direction. Use Le Chtelier's principle to explain why the melting point of such a substance should increase with pressure. Select all that apply. An increase in pressure should favor the system with the lower volume, i.e. the solid. If the substance is at its melting point at a pressure of one atmosphere, and then if the pressure were to be increased, more solid would form at the expense of liquid - that is more of the substance would freeze. If the substance is at its melting point at a pressure of one atmosphere, and then if the pressure were to be decreased, more solid would form at the expense of liquid - that is more of the substance would freeze. If melting were to be accomplished at the lower pressure, it would require a temperature that is higher than the normal melting temperature. If melting were to be accomplished at the higher pressure, it would require a temperature that is higher than the normal melting temperature. An decrease in pressure should favor the system with the lower volume, i.e. the solid