Parallel answers seem to state that dissolving is not a reaction, which seems weird to me, but OK.
I see that that is the standard terminology (which I was not previously aware of), but setting the terminology this way makes about as much sense to me as saying that there is no difference, as far as the chemistry is concerned, between a measure of distilled water and a measure of strong acid.
I'm not sure why that's not considered "chemistry".
chemical reaction: process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
So, a chemical reaction is not just what you would colloquially describe as a reaction of something that belongs to the realm of chemistry, it has a specific definition. A reaction is H + O2 = H2O (omitting concerns of stoichiometry for simplicities sake). A reaction is not e.g. salt dissolving in water, because salt stays salt (NaCl) and water stays water (H2O)
This is something I wonder about. How separate are the salt ions when salt dissolves in water? If you add a chunk of sodium to water it will explode; that doesn't happen when you add salt.