⚗️ Interactive Chemistry Lab
Balancing
Chemical
Reactions
Master atomic conservation through interactive experiments, animations, and challenges.
10Slides
2Exercises
5Quiz Qs
Concept 01
What is a Chemical Reaction?
⚛️
Reactants
Starting substances on the left side of the equation.
A + B →
✨
Products
New substances formed on the right side of the equation.
→ C + D
⚖️
Conservation
Atoms are never created or destroyed in a reaction.
In = Out
Hydrogen + Oxygen → Water
Concept 02
Law of Conservation of Mass
"Matter is neither created nor destroyed in a chemical reaction."
— Antoine Lavoisier, 1789
2Fe + 3O⇌Fe₂O₃
Both sides: 2 Fe + 3 O atoms ✓
Method
How to Balance Equations
01
Write the Unbalanced Equation
Use correct chemical formulas for all reactants and products.
H₂ + O₂ → H₂O
02
Count Atoms on Each Side
Tally every element and identify imbalances.
03
Add Coefficients (Not Subscripts!)
Place numbers in front of formulas only — never change subscripts.
2H₂ + O₂ → 2H₂O
04
Verify Both Sides Match
Recount all atoms to confirm equality.
Animation
Watch: Forming Water
2H₂ + 1O₂ → 2H₂O
H atoms:4→4✓
O atoms:2→2✓
Exercise 01
Balance: H₂ + O₂ → H₂O
Exercise 02
Combustion of Methane
🔥Methane (CH₄) burns in oxygen producing CO₂ and H₂O — how natural gas stoves work!
Concept 03
Types of Chemical Reactions
➕
Synthesis
A + B → AB
2H₂ + O₂ → 2H₂O
💥
Decomposition
AB → A + B
2H₂O → 2H₂ + O₂
🔥
Combustion
Fuel + O₂ → CO₂ + H₂O
CH₄ + 2O₂ → CO₂ + 2H₂O
🔄
Single Replacement
A + BC → AC + B
Zn + 2HCl → ZnCl₂ + H₂
🔀
Double Replacement
AB + CD → AD + CB
NaCl + AgNO₃ → NaNO₃ + AgCl
← Click a reaction type to learn more
Quiz Time!
Test Your Knowledge
Summary
Key Takeaways
⚖️Conservation of MassAtoms are never created or destroyed.
🔢Coefficients OnlyChange numbers in front, never subscripts inside formulas.
📋Count Every AtomTally each element on both sides systematically.
🔄One Element at a TimeSave H and O for last when balancing.
✅Always VerifyRecount all atoms after balancing to confirm.
Quick Reference
SynthesisA + B → AB
DecompositionAB → A + B
CombustionFuel + O₂ → CO₂ + H₂O
Single Rep.A + BC → AC + B
Double Rep.AB + CD → AD + CB