The German zeppelin Hindenburg was filled with hydrogen gas. Not surprisingly, the airship was destroyed in a violent fire near Lakehurst, New Jersey on May 6, 1937.
We know that chemical reactions are often exothermic or endothermic. What do these words mean in terms of chemical reactions? What are observable chemical indicators of each? Is the combustion of hydrogen exothermic or endothermic?
When a chemical reaction is exothermic it means that heat was released in the reaction. A exothermic reation has taken place when heat light or sound has been released. The combustion of hydrogen is exothermic.
http://chemistry.about.com/od/lecturenotesl3/a/endorxns.htm
http://www.openencyclopedia.net/index.php/Exothermic_reaction
When a chemical reaction is endothermic it means that heat was absorbed during the reaction. Usually, when a substance is melted, boiled or evaporated, it indicates that a endothermic reaction has taken place.
http://chemistry.about.com/od/lecturenotesl3/a/endorxns.htm
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