EVERYDAY SCIENCE

Detailed explanation-1: -Hydrogen. Hydrogen ignites in air. If hydrogen is present in a test tube, a lighted splint held near its mouth ignites with a squeaky pop.

Detailed explanation-2: -Hydrogen (H2) When a burning splint is introduced to a sample of pure hydrogen gas, it will burn with a popping sound.

Detailed explanation-3: -Testing for hydrogen gas You can safely test for small quantities of hydrogen gas (eg collected in a test tube) by holding a burning splint near to the top of the test tube. The positive result is a squeaky pop sound as the hydrogen reacts with oxygen in the air in a small explosion.

Detailed explanation-4: -Students light a small splint, like a wooden coffee stirrer, blow out the flame but leave the embers, and then place the glowing splint into the unknown gas. In carbon dioxide, the splint goes out completely. In oxygen, the splint reignites. In hydrogen, a reaction with oxygen occurs that sounds like a bark.

Detailed explanation-5: -A characteristic test for hydrogen (H2) gas can be performed by bringing a burning candle near the source of hydrogen. On doing so, hydrogen gas burns with a squeaky pop sound. Hydrogen gas is recognized by the ‘pop’ when it burns. The ‘pop’ is the sound of a small explosion.