Balancing Equation --By Tina Zhao

Balancing Equation:
- The aim of balancing equation is to make the number of atoms of each kind on the reactant side equal to those on the product side. 


Rule:
-Chemical formulas of reactants are listed on the lefthand side of the equation. 
-Products are listed on the righthand side of the equation. 
-Reactants and products are separated by putting an arrow between them to show the direction of the reaction. Reactions at equilibrium will have arrows facing both directions. 
- First balance the atoms which only occur in one molecule on each side of equation
Balance whole group whenever possible, rather than considering the atoms of groups separately
- Be systematic: do not jump all over an equation balancing a bit here and bit these
-balance atoms which occur in elemental from last. By elemental form we mean that the atoms are not combined with atoms of a different kind.

Example for balancing equation:

step 1:

step2:

step3:

step4:

http://www.files.chem.vt.edu/RVGS/ACT/notes/scripts/bal_eq1.htm

http://www.sciencegeek.net/Chemistry/taters/EquationBalancing.htm

http://misterguch.brinkster.net/PRA008.pdf

Open these links, these links may help you for balancing equation. 

Ionic Compound:

Ionic compounds are basically defined as being compounds where two or more ions are held next to each other by electrical attraction. One of the ions has a positive charge (called a "cation") and the other has a negative charge ("anion").I

example:

NaCI :  Sodium Chloride

K2SO4：potassium Sulphate

FE2O3:  Iron(III）Oxide

Covalent Compound:

-Bonding between non-metals consists of two electrons shared between two atoms. 

Mono: 1 Di:2  Tri:3 Tetra:4 Penta: 5 Hexa:6 Hepta:7 Octa:8 Nona:9 Deca:10 Hendeca:11 Dadeca:12