Hydrogen is a flammable gas commonly produced in reactions between metals and acids. It can be easily identified using the squeaky pop test.

How to Test for Hydrogen:

1. Collect the Gas:

• During a reaction that produces hydrogen gas, collect the gas in a test tube.

2. Perform the Squeaky Pop Test:

• Light a splint (a thin piece of wood, like a matchstick) and carefully hold it at the mouth of the test tube containing the gas.

3. Observe the Result:

• If hydrogen is present, you will hear a squeaky pop sound. This sound is caused by the hydrogen gas reacting quickly with the oxygen in the air, producing a small explosion.