Term 3 Science Day 2
In science, We did the Copper Coin Experiment the coin went from, copper to silver to gold.
Zinc + sodium hydroxide = the silver coin
The copper coin was covered with zinc which made it silver
The copper + zinc over a flame made the coin gold/ brass
1. Clean coin in salt+vinegar solution
2. Put 50mL of 2molL Na0H into a beaker
3. Heat on bunsen burner until NEARLY boiling-Stir as heating then take off heat
4. Add a spatula of zinc powder
5. Heat lightly for 3 minutes, with coin in-Stir as heating
6. Take the coin out with tongs
6. Take the coin out with tongs
7. Rinse coin under water to remove chunks of zinc
8.Wave coin in the blue flame using tongs
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