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Build-a-Molecule (PhET): https://phet.colorado.edu/sims/html/build-a-molecule/latest/build-a-molecule_all.html — combine atoms into molecules and note how many of each atom a molecule needs.
- Are there chemical changes that do not obey conservation of mass?
- Every reaction tested so far has obeyed the law.
- The journey of exploring matter is far from over.
- Keep questioning and keep investigating!