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Reversible Change changes like melting and freezing that can be undone Forever Change changes that last forever like rusting metal Physical Change a change that only happens in appearance, the molecules have not changed, a physical change can be weathering Chemical Change a change that molecules break-up and reform,it is not reversible, physical properties change but not molecules Physical Change change including, shape, size, texture, volume, mass, weight or density Atomic Number number of protons Atomic Weight mass Atomic Mass - Atomic Number = Number of Neutrons