Define and discuss spontaneous reactions, which occur without outside interference. Determine that they occur only in the direction that leads to equilibrium . Show examples of spontaneous reactions and elicits that they are all exothermic . Change in heat energy is negative. List and discuss. Few reactions occur spontaneously, but possess a positive heat of reaction. Use melting of ice when left in a beaker sitting on a table top. Elicit what occurs when a beaker of cold water is left sitting out. Define which way the heat energy moves. Discuss the energy transfer as heat is from hot to cold, from surrounding to system.