Transcript The Cool Balancing Chemical Reactions Presentation

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