Hello! I have a demo due tomorrow and I am not able to find chemical equations for this demonstration or the exact chemistry explained in high- school terms so I can make sense of it. Any help would be greatly appreciated!!
2007-05-14 16:11:22 · 2 answers · asked by Sarah H 1 in Science & Mathematics ➔ Chemistry
This site explains and gives reactions.
http://chemlearn.chem.indiana.edu/demos/TheGold1.htm
2007-05-14 16:20:09 · answer #1 · answered by Anonymous · 0⤊ 0⤋
First, start with a penny that was minted before 1983. Pennies minted after that are made of zinc and copper and melt too easily in the burner flame used in the demonstration. You heat the penny in a NaOH solution with Zn metal. The zinc dissolves to Na2Zn(OH)4 and the Zn2+ coats the penny. You heat the "wet" penny in a gas burner flame, and the Zn and Cu melt together to form brass, which appears "golden."
2007-05-14 23:25:39 · answer #2 · answered by steve_geo1 7 · 0⤊ 0⤋