- Make a spiral of copper wire.
- Heat the spiral over an alcohol lamp until it’s red hot.
- Wait until the wire cools.
- Lower the wire in any halogenated organic compound. For example, you can take chloroform.
- Put the wire into the flame again.
- Observe the green flames.
- Repeat steps 2-6 for the other compounds. Make sure that the test is positive for halogens (except fluorine). For example, you can also use 1-bromobutane and any product made from polyvinyl chloride.