Asubstance which alters the rate of a chemical reaction but is not permanently changed by the reaction is called a(

catalyst

Explanation:

a substance which alters the rate of a chemical reaction but is not permanently changed by the reaction is called a catalyst

i believe that it is a exoplanet

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.