Which chemical equation correctly represents the decomposition reaction that takes place when ammonia breaks down to form hydrogen gas and nitrogen gas?ANH3 + H2 → N2BNH3 → N2 + H2CNH3 → NH2 + HDN2 + H2 → NH3?

The best option is B

B NH₃ → N₂ + H₂

The reaction for ammonia decomposition is given as

2NH₃ → N₂ + 3H₂

Explanation:

In catalytic decomposition of ammonia two molecules of ammonia (NH₃) are split into three  molecules of hydrogen (H₂) and one molecule of nitrogen (N₂) in a slightly  endothermic  reaction process as follows

2NH₃ → N₂ + 3H₂ with ΔH = 11 kcal/mol

Ammonia is known to decompose in the presence of platinum loaded titanium oxide photocatalyst and it should also be noted that at high temperatures  the rate of ammonia decomposition is appreciable in the process of carbonitriding

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.