A simple case Student activity Play

A simple case of definite integral Whiteboard exercise Play

A simple electric motor Illustration Play

A simple generator of alternating current Whiteboard exercise Play

A simple generator of alternating current Student activity Play

A simple hydraulic machine Animation Play

A simple identity Student activity Play

A simple trick Animation Play

Ability to react with metals Animation Play

Absorption of light by transition metal ions Animation Play

Acid dissociation constant and pH (1) Student activity Play

Acid dissociation constant for ethanoic acid Animation Play

Acid dissociation constant for lactic acid Animation Play

Acid dissociation constant Ka Student activity Play

Acids (2) Student activity Play

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

Alkalinity of hydroxides Animation Play

All salts are electrolytes Animation Play

Aluminium chloride Animation Play

Ammonium cation Animation Play

Ammonium nitrate Animation Play

Amphoteric metal hydroxides Animation Play

Angles in simple polygons Whiteboard presentation Play

Angles in simple polygons Class activity Play

Asymptotes of a simple rational function Animation Play