Jan 6 Class Balancing Chemical Equations

Balancing with C, H & O (combustion)
To make combustion questions easier to balance, you can do them in particular steps.
1. carbons
2. hydrogens
3. oxygens

2C8H18 + 25O2 -> 16CO2 + 18H2O
C8H18 + 25/2O2 -> 8CO2 + 9H2O
Both are the same.

Alcohols
C2H5OH + 3O2 -> 2CO2 + 3H2O

Words -> Balanced Equations
EX: Sodium Chloride is mixed with Potassium Carbonate. Sodium Carbonate and Potassium Chloride are formed. Write a balance equation.

2NaCl + K2CO3 -> Na2CO3 + 2KCl


ACIDS
Name Formula
Hydrochloric acid HCl
Nitric Acid HNO3
Sulphuric Acid H2SO4
Phosphoric Acid H3PO4
Acetic Acid CH3COOH

Hydrogen makes it acid. -> (almost all)

EX: Nitric Acid is neutralized by barium hydroxide.
2HNO3 + Ba(OH)2 -> Ba(NO3)2 + 2HOH