Any product produced by a pattern of activity is just an end reaction to that activity defined by another observed pattern of sub atomic particles.
No, there's no requirement for them to have been observed in order to be a pattern, and certainly not of sub-atomic particles - observing them can change their behaviour
Consciousness is not defined in terms of a reaction. It is perception.
That's your definition, it's not mine. That sounds like a subjective description of consciousness, not a definition, because it's circular: consciousness is our perception... but that perception requires a consciousness to be aware of the perception, and so on, and so on.
That circularity, though, reinforces the idea that awareness/consciousness are feedback loops in the pattern of activity in the brain.
O.