A sample of water has a mass of 100.0 g. Calculate the amount of heat required to change
the sample from ice at -45.0°C to liquid water at
75.0°C. Use the chart to complete the multiple
steps required to arive at the final answer. Type in
your answers below using 3 digits.

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.