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.

im not exactly sure but i think its b!

it's all four options.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.