Analyze and Conclude 1. Apply Write a balanced chemical equation for the
reaction and calculate the mass of copper (Cu) that
should have formed from the sample of iron (Fe)
used. This mass is the theoretical yield.
2. Interpret Data Using your data, determine the
mass and the moles of copper produced. Calculate
the moles of iron used, and determine the whole-
number iron-to-copper mole ratio and percent yield.
3. Compare and Contrast Compare the theoretical
iron-to-copper mole ratio to the mole ratio you
calculated using the experimental data.
4. Error Analysis Identify sources of the error that
resulted in deviation from the mole ratio given in
the balanced chemical equation.

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.

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