Hydrogen: reactions of elements

Reaction of hydrogen with air

Hydrogen is a colourless gas, H2, that is lighter than air. Mixtures of hydrogen gas and air do not react unless ignited with a flame or spark, in which case the result is a fire or explosion with a characteristic reddish flame whose only products are water, H2O.

2H2(g) + O2(g) → 2H2O(l)

Reaction of hydrogen with water

Hydrogen does not react with water. It does, however, dissolve to the extent of about 0.00160 g kg-1 at 20°C (297 K) and 1 atmosphere pressure.

Reaction of hydrogen with the halogens

Hydrogen gas, H2, reacts with fluorine, F2, in the dark to form hydrogen(I) fluoride.

H2(g) + F2(g) → 2HF(g)

Reaction of hydrogen with acids

Hydrogen does not react with dilute acids.

Reaction of hydrogen with bases

Hydrogen does not react with dilute bases.

WebElements chemistry shop

You can buy periodic table posters, mugs, T-shirts, periodic table fridge magnets, games, molecular models, and more at the WebElements periodic table shop