A sample of ocean sediment is found to contain 1.50 milligrams of uranium-238 and 0.460 milligrams of lead-206. Estimate the age of the sediment. The half-life for the conversion of uranium-238 to lead-206 is 4.51 x 109 years.

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

b. is the answer hoped i        

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.