ACTIVITY 3: Identifying Unknown Samples as Pure Substance or Mixture Given the following materials, design a procedure to identify which sample is a pure substance or a mixture. Matter can be a substance or a mixture. Boiling point and melting point are some of the physical properties of matter. Materials: white sugar, salt, large metal spoon, candle, match, marker pen, timer/watch PROCEDURE: Pili nuts fried with white sugar makes a delicious crispy pili nut condy. Crispy pili nut is surprisingly brown in color despite using white sugar. What do you think happened?
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It is due to a process called caramelization.
Caramelization is what happens to pure sugar when it reaches 338° F. A few tablespoons of sugar put in a pan and heated will eventually melt and, at 338° F, start to turn brown. At this temperature, the sugar compounds begin to break down and new compounds form.