A change in the intensity of X-radiation Whiteboard exercise Play

A sponge and its structure Whiteboard exercise Play

A V-shaped molecule of sulphur dioxide Animation Play

About cells Student activity Play

Absorption of digestive products – role and adaptations of the small intestine Student activity Play

Absorptions of substituted benzenes in the fingerprint region Chart Play

Absorptions of substituted benzenes in the 'fingerprint region' Chart Play

Acetylcholine structure Illustration Play

Acid–base reactions in a non-aqueous medium Animation Play

Acylation of benzene by the Friedel–Crafts method Whiteboard exercise Play

Acylation of benzene by the Friedel–Crafts method Student activity Play

Age and sex structure of populations Student activity Play

Age structure of populations Slideshow Play

Alkadienes and cycloalkenes Student activity Play

Alkalinity of hydroxides Animation Play

Alkanes and cycloalkanes Class activity Play

Alkanes and cycloalkanes Whiteboard presentation Play

Alkenes Class activity Play

Alkenes Whiteboard presentation Play

Alkyl and aryl groups Animation Play

Alkyl derivatives of benzene Animation Play

Alkylation of benzene by the Friedel–Crafts method Whiteboard exercise Play

Alkylation of benzene by the Friedel–Crafts method Student activity Play

Allotropes of carbon Animation Play

Amino acid structure Whiteboard exercise Play