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Yes! The law of conservation of mass was established in 1789 by French Chemist Antoine Lavoisier. The law states that matter cannot be destroyed or created in any ordinary chemical reaction. This simply means that the mass of the reactants must be equal to the mass of the product. This is the reason why we have to balance chemical reactions, so that there are the same amount of each element in the reactants as there are in the product. If the law of conservation of mass did not apply the equation H2 + O2 -> H2O would work. Since there are 2 hydrogen atoms and only 1 oxygen atom in the product, this breaks the law of conservation of mass. To make it correct the equation would have to be 2H2 + O2 -> 2H2O. Example on next slide. http://www.mi.mun.ca/users/edurnfor/1100/atomic%20structure/tsld004.htm H2 + O2 2 H2O 2 = 2 1 2H2 + O2 2H2O 4 2 = 4 2 http://richardbowles.tripod.com/chemistry/balance.htm http://i60.photobucket.com/albums/h15/mvs1979/owlOMG.jpg http://www-evasion.imag.fr/~Francois.Faure/doc/inventorMentor/sgi_html/figures/14.15.ex.14.3.gif http://richardbowles.tripod.com/chemistry/balance.htm http://richardbowles.tripod.com/chemistry/balance.htm CO2 + H2 CH4 + H2O 12 1 2 6 1 CO2 + 4H2 CH4 + 2H2O 1 2 8 1 http://richardbowles.tripod.com/chemistry/balance.htm 8 2 “Law of Conservation of Mass” http://www.mi.mun.ca/users/edurnfor/1100/atomic%20structure/tsld004.htm “Balancing Chemical Reactions” http://richardbowles.tripod.com/chemistry/balance.htm “Unbalanced Scale” http://www-evasion.imag.fr/~Francois.Faure/doc/inventorMentor/sgi_html/figures/14.15.ex.14.3.gif “Omg Owl” http://i60.photobucket.com/albums/h15/mvs1979/owlOMG.jpg