The building blocks of life on Earth may have been fueled by tiny sparks hopping between water droplets.

A cotton swab is dipped into concentrated hydrochloric acid (producing hydrogen chloride gas) while a second on is dipped into concentrated aqueous ammonia (producing ammonia gas). Both cotton swabs ...

When writing chemical equations for reversible reactions, the usual one-way arrow ... can break down to form ammonia and hydrogen chloride. It also shows that ammonia and hydrogen chloride ...

In a chemical equation ... In these conditions, some of the hydrogen and nitrogen will react to form ammonia. Stage four The unreacted nitrogen and hydrogen, together with the ammonia, pass ...