All unmarked beakers contain fast-acting, extremely toxic poisons. No experiment is a complete failure. At least it can serve as a negative example. Any delicate and expensive piece of glassware will break before any use can be made of it. Chemists do it reactively.
Chemists do it in test tubes.
Chemists do it in equilibrium. Chemists do it in the fume hood. Chemists do it periodically on table. Chemists do it organically and inorganically. Electrochemists do it with greater potential.