Why are chemical changes considered “unseen”?

Because they occur at an atomic level, changing the actual structure of the thing.

Chemical changes are usually considered unseen because it changes the chemical form of the atom, by breaking or forming new bonds.

Ifound this on google “how does an observation of an object differ from an inference about it? observations uses one or more of the senses to gather in formation and record it but an inference is a logical interpretation of the prior knowledge like testing samples.” i hope this you for what your looking for. can you plz mark me brainliest?

Gas will most likely  fill the container