Chemical Equation Interactive Balancer Lab

Learn why and how chemical equations are balanced under the Law of Conservation of Mass. Adjust reactant and product stoichiometric coefficients and watch the atom scales level out in real-time.

NCERT Chemical Balancer BenchLive Balance Scale

Reaction: Steam on Red-Hot Iron

Adjust Coefficients to Balance the Reaction:

1
Fe (s)  + 1
H₂O (g)  → 1
Fe₃O₄ (s)  + 1
H₂ (g)

Iron (Fe)

Left: 1

Right: 3

Unbalanced

Hydrogen (H)

Left: 2

Right: 2

Balanced

Oxygen (O)

Left: 1

Right: 4

Unbalanced

Equation is Unbalanced! Total atoms on LHS ≠ Total atoms on RHS.

NCERT Class 10: Step-by-Step Hit and Trial Method

In Class 10 CBSE Board Exams, writing state symbols and showing the balancing table awards full step marks.

The 4 Golden Steps of Balancing:

Step 1: Draw boxes around each formula. Do not change anything inside the boxes (never modify subscripts like changing $H_2O$ to $H_2O_4$). Only change coefficients outside.
Step 2: Start with the compound containing maximum atoms. In $Fe_3O_4$, oxygen has 4 atoms. Balance oxygen first by putting 4 before $H_2O$: $Fe + 4H_2O \to Fe_3O_4 + H_2$.
Step 3: Balance remaining elements (Fe and H). Hydrogen now has $4 \times 2 = 8$ atoms on LHS. Place 4 before $H_2$ on RHS. Iron has 3 atoms on RHS, so place 3 before $Fe$ on LHS.
Step 4: Check and add physical states. Final balanced equation: $3Fe (s) + 4H_2O (g) \to Fe_3O_4 (s) + 4H_2 (g)$. (Note: steam is indicated as gas $(g)$).

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