Is chemistry hard science? We mostly memorize a ton of arbitrary rules about how things should react and behave. We still get surprise molecules with surprise p

Is chemistry hard science? We mostly memorize a ton of arbitrary rules about how things should react and behave. We still get surprise molecules with surprise properties. The science part is that we identify them and add them to our long catalog of rules, but is it hard science ? I would only classify math and some physics as hard science.