2. Balancing chemical
hy equations:
W balance chemical equations?
t be
nno r
r ca D n o
atte TE
M A !!!!
CRE ROYED
DE ST
Antoin
e Lavo
isie r

3. So you have to be able
to count atoms!
Rules:
1- subscripts only apply to the element they
are after. (sometimes you have to distribute)
2- Coefficients apply to all elements in the
chemical they are attached to.

4. Count the atoms in each
compound…
• H2O • 2CH4
• 2H2O • Ca(NO3)2
• 4FeCl3 • 2Ca(NO3)2

5. Water is made from which
elements?
Hydrogen & Oxygen
Reactants Products
H2 + O2 H 2O
+

6. 2 H2 + O2 2 H2 O
+
Both side are BALANCED!

8. Cl2 + NaBr  NaCl + Br2