Make the idea your own
- 1Count hydrogen atoms on each side.
- 2Count oxygen atoms separately.
- 3Adjust whole-molecule counts, then run the rearrangement.
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Class 10 · Chemistry
Balance a reaction
Interactive explanation Gamified quiz, feedback & rewards
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NCERT chapter connection · Learning goals & preparation
By the end, you can…
- Explain ? H₂ + ? O₂ → 2 H₂O
- Change one input at a time and predict its effect before checking the model.
- Apply the relationship in a quiz and explain the reasoning behind your answer.
Useful preparation: Counting particles, ratios and the difference between a model and a real substance.
Science · Chemical Reactions and Equations
NCERT Science · reprint 2025–26. This activity explores part of the chapter; it does not replace the textbook. Open official NCERT reference ↗
Hands-on explainer · Class 10
Balance a reaction
Class 10
CLASS 10 · CONCEPT QUEST
Turn understanding into a small adventureBalance a reaction
Discover the rule, predict what happens, then solve a hands-on mission.
DiscoverFind the idea→PredictThink it through→BuildMake it click
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The relationship? H₂ + ? O₂ → 2 H₂O
Explain the experiment
When the goal is met: 2 H₂ + O₂ → 2 H₂O conserves four hydrogen atoms and two oxygen atoms.