In science I was given permission to conduct an experiment of my own accord based off an experiment we did in class around giving a 10c piece a gold coating.
Aim: To test which New Zealand unused and modern coin contain copper.
Equipment: Beaker, Bunsen burner, Tripod, Heatmat, Cold tap, Sodium hydroxide, Zinc powder, NZ coins, Gauze mat.
Method:
1. Heat coins in sodium hydroxide until steaming, then turn off bunsen burner.
2. Add zinc powder and stir for a while until water starts clearing and the coins should be silver, clean coins.
3. Hold coins in fire, desired result is a gold sheen, cool in water.
Results:
New Zealand 1c - yesNew Zealand 2c - yes
New Zealand 50c - yes
New Zealand 5c - yes
New Zealand 10c - yes
New Zealand old 10c - no
New Zealand 20c - no
New Zealand half penny - not really
American 1c (bc I had one) - yes
Air Force Museum flat pressed 10c - yes
New Zealand half penny - not really
American 1c (bc I had one) - yes
Air Force Museum flat pressed 10c - yes
Observations:
There is a golden colored alloy called brass, brass consists of zinc and copper. The coins with copper in them would combine with the zinc powder to cause the coins to be coated in brass.
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