Secondary Chemistry Simulations by PHET

awesome stuff! thanks to Yiru for sharing for the building on http://iwant2study.org/ospsg/index.php/simulations/chemistry

STABLE oxygen atom
https://phet.colorado.edu/en/simulation/build-an-atom

water molecule
https://phet.colorado.edu/en/simulation/build-a-molecule

an unstable oxygen isotope that rarely exists in nature
https://phet.colorado.edu/en/simulation/isotopes-and-atomic-mass

balancing an equation with balance tool
https://phet.colorado.edu/en/simulation/balancing-chemical-equations

concentration, making a very concentrated drink :)
https://phet.colorado.edu/en/simulation/concentration

making water with 2 H2 and 1 O2 reactions to produce 2 (H2O) with zero leftovers
https://phet.colorado.edu/en/simulation/reactants-products-and-leftovers

so water is not an acid?
https://phet.colorado.edu/en/simulation/acid-base-solutions