3.  When you balance an equation you have to have the same amount of atoms on both sides.  To do this you need to add coefficients in front of the element to make molecules. (You can’t change a subscript.)  Example: If you want to make 2 molecules of Aluminum then you have to add a coefficient not a subscript.  Al  2Al Al 2 http://richardbowles.tripod.com/chemistry/balance.htm WWhen you balance an equation you have to have the same amount of atoms on both sides. TTo do this you need to add coefficients in front of the element to make molecules. (You can’t change a subscript.) EExample: If you want to make 2 molecules of Aluminum then you have to add a coefficient not a subscript. AAl  2Al Al 2 http://richardbowles.tripod.com/chemistry/balance.htm

7.  Fe + Cl2 = FeCl3  KMnO4 + HCl = KCl + MnCl2 + H2O + Cl2  K4Fe(CN)6 + H2SO4 + H2O = K2SO4 + FeSO4 + (NH4)2SO4 + CO  C6H5COOH + O2 = CO2 + H2O  K4Fe(CN)6 + KMnO4 + H2SO4 = KHSO4 + Fe2(SO4)3 + MnSO4 + HNO3 + CO2 + H2O  Cr2O7{-2} + H{+} + {-} = Cr{+3} + H2O  S{-2} + I2 = I{-} + S  PhCH3 + KMnO4 + H2SO4 = PhCOOH + K2SO4 + MnSO4 + H2O  CuSO4*5H2O = CuSO4 + H2Ohttp://www.webqc.org/balance.phphttp://www.webqc.org/balance.php  Fe + Cl2 = FeCl3  KMnO4 + HCl = KCl + MnCl2 + H2O + Cl2  K4Fe(CN)6 + H2SO4 + H2O = K2SO4 + FeSO4 + (NH4)2SO4 + CO  C6H5COOH + O2 = CO2 + H2O  K4Fe(CN)6 + KMnO4 + H2SO4 = KHSO4 + Fe2(SO4)3 + MnSO4 + HNO3 + CO2 + H2O  Cr2O7{-2} + H{+} + {-} = Cr{+3} + H2O  S{-2} + I2 = I{-} + S  PhCH3 + KMnO4 + H2SO4 = PhCOOH + K2SO4 + MnSO4 + H2O  CuSO4*5H2O = CuSO4 + H2Ohttp://www.webqc.org/balance.phphttp://www.webqc.org/balance.php

8.  http://richardbowles.tripod.com/chemistry/bal ance.htm http://richardbowles.tripod.com/chemistry/bal ance.htm  http://chemistry.about.com/cs/stoichiometry/ a/aa042903a.htm http://chemistry.about.com/cs/stoichiometry/ a/aa042903a.htm  http://www.webqc.org/balance.php http://www.webqc.org/balance.php  http://www.sky- web.net/science/balancing_chemical_equation s.htm http://www.sky- web.net/science/balancing_chemical_equation s.htm