balancing equations
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Balancing Equations. Balancing Equations Notes…27. Equations must be balanced because matter can’t be created or destroyed- Law of Conservation of Mass Must have equal numbers of atoms of each element on both sides When balancing equations you may only add a coefficient . - PowerPoint PPT PresentationTRANSCRIPT
Balancing Equations
Balancing Equations Notes…27• Equations must be balanced because matter can’t
be created or destroyed- Law of Conservation of Mass
• Must have equal numbers of atoms of each element on both sides
• When balancing equations you may only add a coefficient.
• You may NOT change a subscript! (this will change the compound)
3H20Coefficient Subscript
NaNO3
Na:
N:
O:
2NaNO3
Na:
N:
O:
MgPO3
Mg: P:
O:
6MgPO3
Mg:
P:
O:
Ex. 1: Na + I2 NaI
+ NaI I
Na
Na I
Na I
Ex. 2: K2O + H2O KOH
KK
O
H H
O
K O H+
K O H
Ex. 3: Mg + HCl MgCl2 + H2
Mg H Cl+ MgH
H
Cl
Cl
+
HCl
Ex. 4: S + O2 SO3
O O O O O+S S
Ex. 5: CH4 + O2 CO2 + H2O
Hint: Fix the hydrogen's first!
Ex. 6
S= S=O= O=
Ex. 7
H= H=N= N=
Ex. 8
Al= Al=O= O=
Ex. 9
P= P=O= O=
Ex. 10
Al= Al=Br= Br=