Transcript Balancing Equation

Balancing
Equations
By Inspection

What do they Represent
 Why Must they be Balanced
 Balancing By Inspection
Chemical Equations
A way to represent
a chemical reaction
n paper.
o
Equations must
be balanced:
Atoms can be
neither created
nor destroyed by
ordinary chemical
means.
Equations must
be balanced:
This means we must
always have the same
number of each type
of atom on both sides
of the equation.
7 steps to balance
by inspection
1. C h e c k f o r
diatomic molecules H2 - N2 - O2 - F2 - Cl2 - Br2 - I2

If these elements appear by
themselves in an equation,
they MUST be written with
a subscript of 2.
7 steps to balance
by inspection
2. B a l a n c e
3. B a l a n c e
4. B a l a n c e
5. B a l a n c e
metals
nonmetals
oxygen
hydrogen
7 steps to balance
by inspection
6. R e c o u n t a l l a t o m s
7. I f E V E R Y c o e f f i c i e n t
will reduce, rewrite
the whole equation
using the simplest
ratio of coefficients.
Balance this equation
K C l O 3 --> K C l + O
2 K C l O 3 --> 2 K C l + 3 O 2
Balance this equation
Na2O2 + H2O --> NaOH + O
2Na2O2 + 2H2O --> 4NaOH + O2
Balance this equation
Al + H2SO4 --> Al2(SO4)3 + H
2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
Balance this equation
Hg(OH)2 + H3PO4 -->
Hg3(PO4)2 + H2O
3Hg(OH)2 + 2H3PO4 --> Hg3(PO4)2 + 6H2O
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KI + Cl --> KCl + I
2KI + Cl2 --> 2KCl + I2
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NH3 + O --> N + H2O
4NH3 + 3O2 --> 2N2 + 6H2O
Balance this equation
Al2S3 + NaHCO3 -->
Al(OH)3 + Na2S + CO2
Al2S3 + 6NaHCO3 --> 2Al(OH)3 + 3Na2S + 6CO2
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CuO + NH3 --> Cu + H2O + N
3 CuO + 2 NH3 --> 3 Cu + 3 H2O + N2
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chlorine + magnesium iodide -->
Cl2 + MgI2 --> MgCl2 + I2
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F + NaOH --> NaF + O + H2O
2 F2 + 4 NaOH --> 4 NaF + O2 + 2 H2O
Balance this equation
sodium chloride + sulfuric acid -->
2NaCl + H2SO4 --> 2HCl + Na2SO4
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potassium nitrate
decomposes into
potassium nitrite
and oxygen
2KNO3 --> 2KNO2 + O2
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bismuth nitrate + calcium iodide -->
2Bi(NO3)3 + 3CaI2 --> 2BiI3 + 3Ca(NO3)2
Balance this equation
NH3 + O --> N2O4 + H2O
4NH3 + 7O2 --> 2N2O4 + 6H2O
Balance this equation
iron (III) oxide reacts
with carbon monoxide
to produce carbon
dioxide and iron
Fe2O3 + 3 CO --> 2 Fe + 3 CO2
E N D E Q UAT I O N S