Chemical Reactions Answers
- What element was the outer layer of the Statue of Liberty originally made from?
The Statue of Liberty was made out of copper. - What evidence is there that a chemical reaction occurred on the surface of the Statue of Liberty?
The copper statue changed color. Originally it was reddish brown. It changed to a pastel green color. - What is the name of the compound formed from the chemical reaction between copper and oxygen?
Copper oxide - What evidence of a chemical reaction do you observe when candles burn?
A burning candle produces light, heat, and smoke. When you extinguish the candle, smoke can be seen rising. This is made from gases and unburned carbon from the chemical reaction. - What evidence of a chemical reaction can be noticed when bread is baked?
The bread rises. The texture and color of the dough change as it bakes. You can see holes inside the bread. (The holes are caused by the production of carbon dioxide from the reaction of yeast and sugar.) - If you watch exploding fireworks from a safe distance, what evidence of a chemical reaction can you observe?
You can see many colors of light. This is evidence of energy released by a chemical reaction. (The different colors created by the fireworks depend on the type of chemicals within the casing. Gold sparks are produced by iron filings. Green fireworks are made by adding a barium compound.) You may also smell smoke.
