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Wednesday, January 29, 2014

Physical and Chemical Changes Quiz

How well can you distinguish between physical and chemical changes? Physical changes involve a change in the form of a substance, but it remains the same on the molecular level. On the other hand, chemical changes involve chemical reactions. New products are created, often accompanied by changes in temperature or color. Melting the wax of a candle is an example of a physical change. The wax only changes shape -- it's still wax. Burning a candle is a chemical change. The wax undergoes a chemical reaction, producing carbon dioxide and water. Do you think you understand? Here's a quick self-test you can take to check whether you can tell the two types of changes apart... Try the quiz

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