1. NH₃ → N₂ + H₂
Balanced: 2NH₃ → N₂ + 3H₂
Atoms: N = 2, H = 6 on both sides.
2. NO₂ → NO + O₂
Balanced: 2NO₂ → 2NO + O₂
Atoms: N = 2, O = 4 on both sides.
3. P₄ + H₂ → PH₃
Balanced: P₄ + 6H₂ → 4PH₃
Atoms: P = 4, H = 12 on both sides.
4. CH₃OH → CO + H₂
Balanced: 2CH₃OH → 2CO + 4H₂
Atoms: C = 2, H = 8, O = 2 on both sides.
5. C + H₂O → CH₄ + O₂
Balanced: C + 2H₂O → CH₄ + O₂
Atoms: C = 1, H = 4, O = 2 on both sides.
6. CH₄ + O₂ → CO₂ + H₂O
Balanced: CH₄ + 2O₂ → CO₂ + 2H₂O
Atoms: C = 1, H = 4, O = 4 on both sides.
7. SO₂ + H₂ → S + H₂O
Balanced: SO₂ + 2H₂ → S + 2H₂O
Atoms: S = 1, O = 2, H = 4 on both sides.
8. C₂H₆ + O₂ → CO₂ + H₂O
Balanced: 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
Atoms: C = 4, H = 12, O = 14 on both sides.
9. C₂H₂ + O₂ → CO₂ + H₂O
Balanced: 2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
Atoms: C = 4, H = 4, O = 10 on both sides.
10. CS₂ + O₂ → CO₂ + SO₂
Balanced: CS₂ + 3O₂ → CO₂ + 2SO₂
Atoms: C = 1, S = 2, O = 6 on both sides.
11. CO₂ + H₂O → C₂H₅OH + O₂
Balanced: 2CO₂ + 3H₂O → C₂H₅OH + 3O₂
Atoms: C = 2, H = 6, O = 7 on both sides.
12. NH₃ + O₂ → N₂ + H₂O
Balanced: 4NH₃ + 3O₂ → 2N₂ + 6H₂O
Atoms: N = 4, H = 12, O = 6 on both sides.
13. NO₂ + H₂O → HNO₃
Balanced: 3NO₂ + H₂O → 2HNO₃ + NO
Atoms: N = 3, O = 7, H = 2 on both sides.
Review:
1. The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. In a balanced chemical equation, the total mass of the reactants equals the total mass of the products.
2. The Law of Conservation of Mass helps solve chemical equations by ensuring that the number of atoms of each element is the same on both sides of the equation, allowing us to balance the equation correctly.
3. A chemical reaction is a process in which substances (reactants) are transformed into different substances (products) through the breaking and forming of chemical bonds.
4. An atom is the smallest unit of an element that retains the chemical properties of that element. A molecule is a group of two or more atoms bonded together, representing the smallest unit of a compound that can exist independently.
Parent Tip: Review the logic above to help your child master the concept of balanced chemical equation worksheet.
