This kransovaty metal has a set of surprising properties. There are situations when it is difficult to distinguish copper from other metal. It causes the mass of funny things. Copper has the unique qualities peculiar only it. Therefore it is necessary to know how to manage to distinguish copper from other metals.
It is required to you
- Copper wire, nitric acid, product from gold, a product from bronze, hot water, table salt, a steel core, the heat conductivity measuring instrument
Instruction
1. It is easy to distinguish copper on external signs. It has reddish-pink color and very plastic.
2. If to leave a copper wire on long time under the open sky, it is possible to see change of its color. At long atmospheric actions, copper becomes covered by a greenish film - patina. It protects metal from corrosion.
3. How to distinguish copper from bronze. It is necessary to smooth out a small surface of an estimated copper wire and bronze, then to water the smoothed-out site with hot salty water. Copper will get more dark shade.
4. How to distinguish copper from gold. If to place a copper wire in nitric acid, it will completely be dissolved. Nitric acid at the same time will get a greenish shade.
5. How to distinguish copper from steel. Copper is distinguished by high heat conductivity. That to see it, it is necessary to heat a copper wire and a steel core and to compare results by means of the heat conductivity measuring instrument.