CHILD DEVELOPMENT PEDAGOGY

Detailed explanation-1: -Hydrogen (H2) When a burning splint is introduced to a sample of pure hydrogen gas, it will burn with a popping sound. Oxygen (O2) When a smoldering splint is introduced to a sample of pure oxygen gas, the splint will reignite.

Detailed explanation-2: -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-3: -The reaction of hydrogen with oxygen is very fast. We know that heat causes gases to expand, so whenever we bring hydrogen in contact with heat it expands, it is so fast that it breaks the sound barrier and as a result we hear a ‘pop’ sound.

Detailed explanation-4: -Burning (or lighted) splint test A splint is lit and held near the opening of the tube, then the stopper is removed to expose the splint to the gas. If the gas is flammable, the mixture ignites. This test is most commonly used to identify hydrogen, which extinguishes with a distinctive ‘squeaky pop’ sound.

Detailed explanation-5: -acid. beehive shelf. Test for Hydrogen: Place a lighted splint in a test tube containing the gas. If the gas is hydrogen, there will be a squeaky pop.