In part C of this experiment, it is possible that some of the unknown solid did not dissolve in the solvent. If this happened, after all other parts of the experiment had been done correctly, what would be the effect on the freezing point with the unknown present? How would the calculated molar mass change for the unknown solid? Specifically state whether the molar mass of the unknown would be erroneously high or erroneously low.

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.

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.