Over the years, the thermite reaction has been used to ignite solid fuel rocket motors. Fe2O3 (s) + 2Al(s)
2Fe() +
Al2O3 (s)
The reaction of 0.3150_mol of Iron (III) Oxide with 16.89 g of solid Aluminum produces 0.05412 lb of
Fe. Find the limiting reactant, theoretical yield (in g), and percent yield.
(14 pts)
(Fe = 55.845 g/mol Al = 26.9815 g/mol 0 = 15.9994 g/mol) (1 lb = 453.59 g)

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.