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2.2. If a system is found to obey the phase rule, may we assume that the system is at equilibrium? Explain your answer. 2.3. Classify the following systems as monovariant, divariant, or in variant. Explain your answers. a. Alpha quartz in equilibrium with beta quartz at the transition temperature. b. Monoclinic zirconia at room temperature. c. Ice in equilibrium with its vapor. 2.4. The following phases are known to exist in a system at constant pressure: Cordierite (2Mg0.2A1,03-5510) Mullite (3A1,03.2SiO) Forsterite (2MgO SIO Protoenstatite (MgO SIO Periclase (Mg0) a. What are the components of the system? b. Could all of the above-listed phases coexist at equilibrium? Explain your answer. 2.5. At 970C the following equation represents an equilibrium reaction: CaCO,sCaO + CO, AH= + 39 kcal/mol From a consideration of LeChatelier's principle, in which direction would you expect the equilibrium to shift if heat were added to the system? If the pressure on the system were decreased? Explain how you arrived at your answers