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Reaction Type & Equation Balancer
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Reaction Types & Conservation of Mass
Classification Mode
Balancing Mode
Problem
1
of 5
Score:
0
/5
What type of reaction is this?
Synthesis
A + B → AB
Decomposition
AB → A + B
Single Replacement
A + BC → AC + B
Double Replacement
AB + CD → AD + CB
Combustion
Fuel + O₂ → CO₂ + H₂O
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Equation
1
of 5
Score:
0
/5
Balance This Equation
Reactants (Left Side)
Atom Count
Products (Right Side)
Reactants
→
Products
Reset Coefficients
Check Balance
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📖 Balancing Rules
📊 Data Journal
Trial 0
My prediction (numeric):
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Prediction
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📋 How to Use This Simulation
Select
Classification Mode
to identify reaction types, or
Balancing Mode
to balance equations
In Classification Mode: study the equation and animation, then pick the reaction type
In Balancing Mode: use
+/−
buttons to adjust coefficients until atom counts match on both sides
Click
Check Answer
/
Check Balance
to get feedback
Keyboard:
Space/Enter = check · R = reset · Esc = close this panel
✕
📖 Quick Reference: Balancing Rules
Rule
Explanation
Only change coefficients
Numbers in FRONT of formulas (e.g.,
2
H₂O)
Never change subscripts
Numbers BELOW change the substance (H₂O ≠ H₂O₂)
Balance one element at a time
Start with metals, end with O and H
Count ALL atoms
Coefficient × subscript = total atoms