5. a.) what is the ratio of liquid to solid at 1500˚c? show your work with clear labels and references to the diagram so that the source of your numbers is obvious.

b.) at what temperature will φ next change? what occurs at this temperature? what is the name of the curve intersected? describe the composition of each phase present. derive the variance. what does f imply?

c.) does cooling from this point represent a continuous or discontinuous reaction? write the reaction.