You will need
- Copper wire, nitric acid, a product of gold, the product of bronze, hot water, salt, steel rod, measuring thermal conductivity
Copper is easy to distinguish by their appearance. She has a reddish pink color and is very plastic.
If you leave the copper wire for a long time under the open sky, you can see the discoloration.With long-term atmospheric impacts of copper is covered with a greenish film of patina. It protects the metal from corrosion.
How to distinguish copper from bronze. Need to clean up small surface alleged copper wire and bronze, then water the bare area with hot salted water. Copper will acquire a darker shade.
How to distinguish copper from gold. If you put copper wire in nitric acid, it is completely dissolved. Nitric acid will acquire a greenish tint.
How to distinguish copper from the steel. Copper features high conductivity. To see this, it is necessary to heat the copper wire and the steel rod and compare the results with the help of conductivity meter.
When determination of the thermal conductivity of the materials must be absolutely dry, so you need to remove all surface moisture.
On the properties of copper is very large influence, it contained impurities. When defining the properties of copper, should be aware of this.