Balancing Chemical Equations: free chemistry simulation
Adjust the coefficients until every atom is conserved. Twelve levels.
▶ Open the simulationFree, no sign-up. Works on phones, tablets and laptops.
The science
Atoms are never created or destroyed in a chemical reaction, so a balanced equation has the same number of each kind of atom on both sides. You balance it by changing the coefficients (the big numbers in front), never the formulas.
2H₂ + O₂ → 2H₂O
Things to try
- Balance the formation of water.
- Balance the combustion of methane.
- Beat all twelve levels without hints.
Topics covered
stoichiometry coefficients conservation of mass atoms
How to use it
Open the simulation, then change the experiment live with the sliders, checkboxes and buttons in the side panel. Drag objects on screen where it makes sense, and use Pause, Step, Speed and Reset in the bottom bar to study every moment.
Frequently asked questions
What does the Balancing Chemical Equations simulation show?
Atoms are never created or destroyed in a chemical reaction, so a balanced equation has the same number of each kind of atom on both sides. You balance it by changing the coefficients (the big numbers in front), never the formulas.
What is the key equation?
2H₂ + O₂ → 2H₂O
Is the Balancing Chemical Equations simulation free?
Yes. It runs free in any web browser on phones, tablets and laptops, with no sign-up or download.
More chemistry simulations
Gas Properties
Pump particles into a box, heat it and change its volume. Ideal gas law and speed distribution.
States of Matter
Heat and cool atoms bound by intermolecular forces: watch solid, liquid and gas form.
pH Scale
Test everyday liquids, dilute them with water, and see how H₃O⁺ and OH⁻ change.
Build an Atom
Add protons, neutrons and electrons. Find the element, its charge and mass number, and whether it is stable.