Explain why carbon-14 cannot be used to accurately determine the age of organic remains that are 1,000,000 years old.

Carbon-14 has a short half-life. - After 1,000,000 years, there would not be enough C-14. - 14C decays quickly. ... - Too little of the original radioactive sample would remain.

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