Basic chemistry help for students and teachers


Interactive Chemistry Worksheets for Students


Periodic table

Naming compounds

Basic formula

Simple compounds

Ionic compounds 1

Ionic compounds 2

Chemical suffixes

Old chemical names

Hydrocarbons - Alkanes

Alkanes, alkenes & alkynes

Alkanols to alkanoic acids


Common compounds

Common formula quiz

Acids, bases and salts

Covalent compounds

Printable worksheets


Hydrogen is a colorless gas that is less dense than air and is highly flammable.

The "pop test" is used to identify hydrogen gas in the school laboratory. A test tube mixture of hydrogen and air will pop when ignited producing water as a by-product. The chemical reaction is

Hydrogen + oxygen ==> Water + Energy

2H2 + O2 ==> 2H2O + Energy

The Hindenburg was a German airship that was filled with hydrogen gas. On landing in the USA in 1937 after a transalantic flight the passenger airship caught fire. Thirty six people died.

The airship did not contain a mixture of hydrogen and oxygen which would of caused and immediate explosion. It burnt as the hydrogen in the airship combined with the oxygen from the atmosphere.

Today, airships use helium gas which is non flammable.

Hydrogen exists as a diatomic molecule and has the formula H2

Chemical name: 
Chemical symbol: 
Atomic Number: 
Electron configuration: 
Atomic weight: 
1.008 amu
Melting point: 
-259 ºC
Boiling point: 
-253 ºC
Physical state: