A balanced diet Slideshow Play

A crown of gold mixed with silver Animation Play

A family of transition metals Animation Play

Absorption of light by transition metal ions Animation Play

Absorption spectra Student activity Play

Absorption spectrum of Ti(III) ions Illustration Play

Acids and alkalis Class activity Play

Active site Animation Play

Addition of elements to alkenes Student activity Play

Aesthetic organic molecules Animation Play

Alloys of gold Animation Play

Alloys of precious metals Slideshow Play

Alloys of tin and precious metals Whiteboard exercise Play

Alloys of tin and precious metals Student activity Play

Aluminium – lead – silver Whiteboard exercise Play

Amides and nitriles Student activity Play

Ammine complexes with non-octahedral geometry Animation Play

Analysis of the energy profile for chemical reactions Whiteboard exercise Play

Archimedes' Experiment Student activity Play

Area of more complex region on the plane Whiteboard exercise Play

Area of more complex region on the plane Whiteboard exercise Play

Areas of more complex regions on the plane Student activity Play

Arrangement of chemical elements in the periodic table Student activity Play

Atomic number Student activity Play

Atomic number Whiteboard exercise Play