Burning is a reaction of an element with Oxygen The substance formed when an element burn in air is the oxide of the element When hydrogen burns it reacts combines with Oxygen to form the oxide of Hydrogen The oxide of Hydrogen is called water Hydrogen is first dried because a mixture of Hydrogen and air explode The gas is then ignited The products condense on a cold surfaceflask containing a freezing mixture A freezing mixture is a mixture of water and ice