Balancing Chemical Equations

R

100

CH₄ + O₂ → CO₂ + H₂O

CH₄ + 2O₂ → CO₂ + 2H₂O

200

SnO₂ + H₂→ Sn+ H₂O

SnO₂ + 2H₂→ Sn+ 2H₂O

300

KOH+ H₃PO₄ → K₃PO₄ + H₂O

3KOH+ H₃PO₄ → K₃PO₄ + 3H₂O

400

What is the law of conservation of mass and how does it apply to balancing chemical equations?

The law of conservation of mass states that atoms cannot be created or destroyed in a chemical reaction. Chemical equations need to be balanced because, if unbalanced, there would be an unequal number of reactants and products which would imply that atoms were created or destroyed.

500

NH₃ + O₂ → NO + H₂O

4NH₃ + 5O₂ → 4NO + 6H₂O

X

100

Fe + Cl₂ → FeCl₃

2Fe + 3Cl₂ → 2FeCl₃

200

Al + O₂ → Al₂O₃

4Al + 3O₂ → 2Al₂O₃

300

As + NaOH  → Na₃AsO₃ + H₂

2As + 6NaOH  → 2Na₃AsO₃ + 3H₂

400

H₃PO₄ + HCl → PCl₅ + H₂O

H₃PO₄ + 5HCl → PCl₅ + 4H₂O

500

Al + HCl → AlCl₃ + H₂

2Al + 6HCl → 2AlCl₃ + 3H₂

N

100

Zn + HCl → ZnCl₂ + H₂

Zn + 2HCl → ZnCl₂ + H₂

200

Au₂S₃ + H₂ → Au + H₂S

Au₂S₃ + 3H₂ → 2Au + 3H₂S

300

What is the difference between reactants and products in a chemical reaction?

Reactants are what a chemical reaction begins with (left side) and products are what is/are formed in a chemical reaction (right side).

400

NH₄NO₃ → N₂ + O₂ + H₂O

2NH₄NO₃ → 2N₂ + O₂ + 4H₂O

500

HClO_{4 +} P₄O₁₀ → H₃PO₄ + Cl₂O₇

12HClO_{4 +} P₄O₁₀ → 4H₃PO₄ + 6Cl₂O₇