1.) What is a "perpetual motion machine"? Provide references (there are hundreds of them). In a world where the First and Second Laws of Thermodynamics must always be obeyed, could a perpetual motion machine ever exist?
2.) Many plastic materials are organic polymers that contain carbon and hydrogen. The oxidation of these plastics in air to form carbon dioxide and water is a spontaneous process; however, plastic materials tend to persist in the environment. Explain.
3.) What is the significance of the change in Gibbs free energy for a reaction?