Box 1 Net mass A - 10 grams
Box 2
Net mass 3 - 5 grams
Box 3
Each made of 1 A and 1 B
Mass box A = 10 grams; Mass box B=5 grams; Mass box C-made of one A and one B
How many grams of B would it take to combine with 20 grams of A?
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particle   p is an electron and particle q is a neutron

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.