hydrogen, the most common gas in the universe, pop, the sound made when hydrogen burns, water, the liquid made when hydrogen reacts with oxygen, balloon, Lavoisier made one that he filled with hydrogen gas, fuel, a substance you burn to release energy like petrol, gas, the state (ie solid liquid or gas) of hydrogen, molecule, the particle formed when two hydrogens join together, zinc, the metal used to prepare hydrogen, hydrochloricacid, the acid used to prepare hydrogen, flammable, hydrogen catches fire easily so is said to be what?.

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