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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?
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The assignment comprised of three questions. First one was to write about what perpetual machine is and if it is possible to create such machine practically. The second question was to describe the spontaneous process of oxidation of plastics and the reason why it tends to persist in the atmosphere. The third question was to understand the significance of Gibbs free energy in general practice.
A 90.0 g piece of hot iron is placed in a calorimeter containing 125 mL water at 19.8 degrees celcius. If the final temperature of both the water and the iron is 24.6 degrees celcius, what is the initial temperature of the hot iron?
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