Loading…
Loading…
GCSE Chemistry · key term
A colourless, flammable gas that gives a pop sound when tested with a burning splint.
Used by Edexcel
Specification 3.12, 6.3 · Paper 1, Paper 2
Revise: Tests for GasesThis connects with reactions of acids: an acid reacting with a suitable metal can produce hydrogen, while an acid reacting with a metal carbonate can produce carbon dioxide. The gas test supplies evidence about which gas was actually formed.
A gas produced when lithium, sodium or potassium reacts with water.
Use a burning splint for hydrogen. A glowing splint is used for a different gas test.
Do not identify hydrogen just because a flame appears: the characteristic positive result is a pop or ‘squeaky pop’ sound.
Name both products: hydrogen gas and the metal hydroxide. The bubbles alone do not identify the gas.
Create a free account to read GCSE Chemistry revision notes for your exam board and track your progress.