Singing test tube || Chemical flute

Can you turn an ordinary test tube into a musical instrument? Here we make a powerful performing chemical flute from a test tube.

Reagents and equipment

1:- Glass tube

2:- Powdered sulfur (5g)

3:- Iron wool

4:- Propane torch

5:- Clamp stand

Procedure 

1. Insert iron wool into a test tube containing powdered sulfur 
2. Sulfur is heated to boil and begins to evaporate then creates sound 

Process

During the evaporation of sulfur waves of hot gas collide with the cold glass of test tube producing sound as from from a flute those it act as a powerful performing chemical flute 

Mean while, sulfur fumes react with iron forming iron(II) sulfide.

  Fe + S → FeS