What were the main uses the inca had for silver and gold?

The Inca used those metals to decorate their palaces and had silverware, cups and dishes made of them. 
Of course, only royalty had that. 

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

Ibelieve it's the pacific islands