law of conservation

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When writing a chemical equation the reactants and products must contain the same number of atoms of each element.
The law of conservation state that no matter is created nor destroyed in physical or chemical changes.
For example we have a carbon and oxygen atom lets see how they react.
C=2
C
C
+
O=2
O
O
O
C
C
O
If you have a formula that is unbalanced then you have to add a coefficient.
2H
H
H
+
O
O
O
2H2O
O
H
O
Coeifficent
2H2O
subscript

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