A change in the state of matter Animation Play

A covalent bond between the same atoms Animation Play

A covalent bond in a hydrogen molecule Animation Play

A diatomic chlorine molecule Animation Play

A double bond Animation Play

A double bond in ethene Animation Play

A Lewis dot-and-cross diagram of a fluorine molecule Animation Play

A Lewis dot-and-cross diagram of a hydrogen chloride molecule Animation Play

A liquid exerts pressure in a different way from a solid Student activity Play

A liquid exerts pressure in a different way from a solid Whiteboard exercise Play

A model of a morphine molecule Illustration Play

A molecule emitting a quantum of radiation Whiteboard exercise Play

A molecule of ethene Animation Play

A molecule of methanamine Animation Play

A V-shaped molecule of sulphur dioxide Animation Play

Abiotic factors Slideshow Play

About the experiment Whiteboard exercise Play

Abundance of chemical elements in nature Student activity Play

Abundance of elements in nature Slideshow Play

Abundance of noble gases in the atmosphere Slideshow Play

Abundance of the elements in the crust and in the whole Earth Animation Play

Acid anhydrides Simulation Play

Acid anhydrides Student activity Play

Acid dissociation constant and pH (1) Student activity Play

Acid dissociation constant for ethanoic acid Animation Play