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Science
Chemical changes
Balancing Equations
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Cards (4)
The law of conservation of mass:
In a chemical reaction, the total mass of the
reactants
is the
same
of the total mass of
products
.
Balance :
A
l
+
Al +
A
l
+
O
2
→
A
l
2
O
O₂ → Al₂O
O
2
→
A
l
2
O
4
A
l
+
4Al +
4
A
l
+
O
2
→
2
A
l
2
O
O₂ → 2Al₂O
O
2
→
2
A
l
2
O
Balance:
H
g
O
→
H
g
+
HgO → Hg +
H
g
O
→
H
g
+
O
2
O₂
O
2
2
H
g
O
→
2
H
g
+
2HgO → 2Hg +
2
H
g
O
→
2
H
g
+
O
2
O₂
O
2
Balance:
H
2
+
H₂ +
H
2
+
C
l
2
→
H
C
l
Cl₂ → HCl
C
l
2
→
H
Cl
H
2
+
H₂ +
H
2
+
C
l
2
→
2
H
C
l
Cl₂ → 2HCl
C
l
2
→
2
H
Cl
