Balancing Chemical Equations
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Balancing Chemical Equations
Count and conserve
In a chemical reaction atoms are rearranged, not created or destroyed. A balanced equation has the same number of each type of atom on both sides.
- There are two oxygen atoms on the left but one on the right.
- There are two hydrogen atoms on the left but one on the right.
- There are no oxygen atoms on the left.
- The equation has too many reactants.
- 2Mg + O₂ → 2MgO
- N₂ + 3H₂ → 2NH₃
- Mg + O₂ → MgO
- H₂ + Cl₂ → 2HCl
Balance the reactions
Count each element on both sides. When a coefficient changes, recount all atoms in that formula.
Explain and apply
State symbols describe physical state: (s) solid, (l) liquid, (g) gas and (aq) dissolved in water.
- (s)
- (l)
- (g)
- (aq)
- Liquid
- Dissolved in water
- Gas
- Solid
3 printable pages
Page 1
Page 2
Page 3
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