(TG) STOICHIOMETRY; quantitative chemistry

LEARNING ABOUT STOICHIOMETRY

• Stoichiometry is a branch of chemistry that deal with the quantitative analysis of chemical reactions
• It is a generalization of mole conversions to chemistry reactions
• To learn about stoichiometry we must have a good grasp on balancing equations  
• Balancing equations involves only simple math, and a periodic table

THE 6 TYPES OF EQUATIONS:

1. Synthesis
2. Decomposition (reverse synthesis)
3. Single Replacement
4. Double Replacement
5. Neutralization (a form of double replacement)
6. Combustion

When balancing equations you have to ensure there are the same number of atoms of each element on either on both sides of the equations. When doing this you can add coefficients to the beginning of an atom/molechule.

When balancing combustion equations a good trick to know is to first balance the Carbons then the Hydrogens and then finally oxygens.

REMEMBER: never change the subscripts when balancing equations.(only when finding the chemical formula)


EXAMPLES:

Al +Ftwo ------> AlFthree = 2Al +3Ftwo ------> 2AlFthree




HthreePOfour ------> Htwo + Pfour + Otwo =  4HthreePOfour ------> 6Htwo + Pfour + 8Otwo



 CHfour + Otwo ------> COtwo + HtwoO =  CHfour + 2Otwo ------> COtwo + 2HtwoO


**** Also remember that in some equations you may have to use fractions balance your equations. As well always reduce to lowest terms.