Balanced chemical equations conserve each element. The example 2 H2+O2→2H2O contains four hydrogen atoms and two oxygen atoms on both sides. Coefficients count molecules, while subscripts describe atoms within each molecule. The animation rearranges labelled groups, not the identities of nuclei. Its rate and path are illustrative, not a safe practical procedure for mixing gases.
Matter and chemistry · Discover & try
Can atoms disappear in a chemical reaction?
Reading level 3 of 5 · IndependentChange
Word help
reactant
A starting substance in a reaction.
product
A substance formed by a reaction.
Watch · Try · Explain
See how it works
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Virtual atom bookkeeping only; no gas mixing, ignition, reaction-rate or laboratory procedure is modelled.
What to look for
- Each element count is conserved
- Molecule counts can change
- An excess reactant can remain
Explain what you noticed
There are 3 H2 groups and 2 O2 groups. After one complete 2 H2+O2 packet reacts, what remains unused?
Keep this idea: Count each element before and after rearranging the groups.
Follow the sources
- American Chemical Society — What Is a Chemical Reaction?
- American Chemical Society — Controlling the Amount of Products
Source material checked 2026-10-28. Explanations and activities by Nepedia. Source links do not imply endorsement.
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