Set up a Bunsen burner below the iron ring. Heat the water until it is boiling. Once the water is boiling place the frozen compound in a test tube, attached to a clamp and melt the compound. Once the compound has melted, remove the test tube from the hot water bath and record the cooling of it until it is frozen with 30 second intervals. Make a graph on Microsoft Excel, being sure to show the cooling curve of it.
Repeat steps one through eight using jello.
Repeat steps one through eight using sugar. The freezing point of the compound we used had a freezing point of about 53 degrees Celsius. From this freezing point the researcher can conclude it is a pure substance, and a true solid because it formed a plateau on the graph. The plateau signified the freezing point. Another substance that was proven to be a pure substance, and a true solid was sugar.