Students place labels on a large graph of a phase diagram, identifying the phase or process for each region (e.g. solid/liquid/melting), the critical and triple points, and a nano-scale model of each phase. This card sort activity is complete with a QR coded answer, making it a technology-compatible, independent learning activity. An answer booklet is also included. Once these cards are printed and cut, the kits can be used from year to year.