Chemical vs dating carbon
They should also understand that the atoms of any element are alike but are different from atoms of other elements.Atoms may stick together in well-defined molecules or they could be packed together in large arrays.The second lesson, Radioactive Decay: A Sweet Simulation of Half-life, introduces the idea of half-life.By the end of the 8th grade, students should know that all matter is made up of atoms, which are far too small to see directly through a microscope.This lesson is the third in a three-part series about the nucleus, isotopes, and radioactive decay.The first lesson, Isotopes of Pennies, deals with isotopes and atomic mass.
Obviously, this works only for things which were once living.
Two million tons of petroleum-derived ethanol is produced annually.
The principal suppliers are from South Africa and Saudi Arabia, but there are also large plants in the United States, Europe and Japan.
The issuance of these tax credits will have to require a certification that the ethanol comes from renewable sources.
The recognized scientific test is the ASTM method D6866-05.