Which statement BEST describes scientific theories? O They are discarded every ten years.
They can never be changed.
They are not supported by data.
They can be modified.

Ithink it is space that makes up 70 percent

Nation of conflicting ethnic groups

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