On what commodity was the city of timmins built? o a) gold ? b) iron o c) silver d) copper

Ibelieve the answer is c

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen