Which condition did you change?
Labs / Chemistry
Equation Balancer
A chemical reaction can rearrange atoms, but it can never create or destroy them. Nudge each species' coefficient up or down and watch the atom-count bars for every element. When both sides carry the same atoms, mass is conserved and the balance scale settles level.
Labs / Chemistry / Equation Balancer
Equation Balancer
A chemical reaction can rearrange atoms, but it can never create or destroy them. Nudge each species' coefficient up or down and watch the atom-count bars for every element. When both sides carry the same atoms, mass is conserved and the balance scale settles level.
Why it matters
Why explore this?
Chemistry connects events too small to see with changes we can measure. This model helps you link particles, energy, and conditions to an observable result.
Explore
Try the model
state unbalancedreactants 0 g/molproducts 0 g/mol
Investigate
Questions to test
Predict first, try it in the model, then use what you observe to answer.
What to try
- Start with water. If you have plenty of H₂ but only one O₂, which side of the scale drops, and why?
- In the methane reaction, can you balance the carbon and hydrogen first and still keep the oxygen matched — or does fixing one element break another?
- Why does rust (Fe + O₂ → Fe₂O₃) need such large coefficients while water needs only small ones?
- When the equation is balanced, why do the two pans read the exact same mass in g/mol?
- Is there more than one set of coefficients that balances a reaction — and if so, what makes one set the “simplest”?
Explain
Make sense of what happened
Describe what happened at the particle or energy level, then connect it to the result you saw. A strong explanation names both the cause and the evidence.
Check
Before you leave
What happened to the particles or energy?
What observation supports your explanation?
If you can answer all three using evidence from the model, you understand the main idea. If not, return to Explore and change one setting at a time.