Download Balancing Chemical Equations

Balancing
Chemical
Equations
7th Grade Science
• A balanced chemical equation
has the same number of each
kind of atom on the reactant side
as on the product side.
• A balanced equation supports the
Law of Conservation of Matter.
● To know if a chemical
equation is balance, you
need to look at the subscript
numbers and coefficients.
• A coefficient is the number that
comes before the chemical
formula and indicates the
number of molecules of that
compound there are.
Coefficient
2 H 2O
Subscript #
H2 +
O2
H2O

H
O
H
H
O
H
H 2 + O2

O
2 H2O
H
O
H
H
O
H
O
H
H
O
2 H2 +
O 2  2 H2 O
H
H
O
H
H
O
H
H
O
H
H
O
Is this chemical equation balanced?
Fe +
S 
FeS
Fe =
Fe =
S=
S=
Balanced
or
Not Balanced
Is this chemical equation balanced?
2 Na + Cl2  2 NaCl
Na =
Na =
Cl =
Cl =
Balanced
or
Not Balanced
Is this chemical equation balanced?
2 Na + O2  Na2O
Na =
Na =
O=
O=
Balanced
or
Not Balanced
Is this chemical equation balanced?
N2 + 3 H2  2 NH3
N=
N=
H=
H=
Balanced
or
Not Balanced
Is this chemical equation balanced?
Cl2 + 2 KI  2 KCl + I2
Cl =
Cl =
K=
K=
I=
I=
Balanced
or
Not Balanced
Is this chemical equation balanced?
C6H12O6 + O2  CO2 + H2O
C=
C=
H=
H=
O=
O=
Balanced
or
Not Balanced
Is this chemical equation balanced?
Mg + 2 HCl  MgCl2 + H2
Mg =
Mg =
H=
H=
Cl =
Cl =
Balanced
or
Not Balanced
Is this chemical equation balanced?
Fe2O3 + HCl FeCl3 + H2O
Fe =
O=
H=
Cl =
Fe =
O=
H=
Cl =
Balanced
or
Not Balanced