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The candle is going through different phases. The candle starts off unlit containing only potential energy in the form of chemical energy. chemical energy is "energy stored in the bonds of chemicals compounds. When it is lit the wax starts to melt because the bonds are broken creating exothermic energy. Which causes the molecules to move back and forth freely creating a liquid wax. A liquid wax differs from a solid wax because in a liquid wax the molecules have space between each other and are not in a certain arrangement. Solid wax does not have space between each other and are packed in a certain arrangement.