Water.
Hydrogen burns in air, usually with a loud pop.
When hydrogen burns in air with H2+O2= H20
when magnesium burns in air a white powder called magnesium oxide is formed which is a new substance this is the chemical change
Water is formed when hydrogen gas burns (reacts) with oxygen (from air) 2 H2(g) + O2(g) --> 2H2O(l)
Hydrogen chloride (HCl). It is commonly known as hydrochloric acid.
Water is the only substance formed but energy (primarily in the form of heat) is also given off.
hydrogen burns in air with a pop sound
Hydrogen should not burn with a blue flame. Hydrogen burns clear. There must be another chemical involved.
Chemical
When hydrogen burns in air, it combines with atmospheric oxygen to form water. Since hydrogen and oxygen are undergoing a chemical change to become chemically bonded together producing H2O the change is chemical in nature.
Steam
pyrophoric