Now that you know a little more about chemical reactions, think about the Rumpelstiltskin story. In the fairy tale, one substance was involved in a process—spinning on the wheel—and then a different substance was made. Straw turned into gold. If the fairy tale were real, then that change would be called a chemical reaction. The substance that Rumpelstiltskin started with (straw) was different from the substance he ended with (gold). In real life, substances can change into other substances, but only in a fairy tale could straw turn into gold. Why? (Hint: Think about what gold is made of.) What is the scientific reason that straw cannot be turned into gold?