Reagents, reactants and products Student activity Play

Relationship between the group number and the number of valence electrons Animation Play

Relative atomic mass and relative molecular mass Student activity Play

Relative atomic mass and relative molecular mass Animation Play

Respiration in plants Whiteboard presentation Play

Resting and action potentials of a neurone Student activity Play

Role of anions in plant cells Slideshow Play

Role of macro-elements absorbed as anions Student activity Play

s-block elements Animation Play

Salts in the human organism Illustration Play

Salts of s-block elements occurring in nature Slideshow Play

Salts of weak acids and strong bases Student activity Play

Salts of weak acids and strong bases Whiteboard exercise Play

Sample formulae Illustration Play

Shampoo Animation Play

Silver nitrate Slideshow Play

Simplified notation of the configuration of an element Animation Play

Skin irritation Animation Play

Sodium Slideshow Play

Sodium carbonate as a standard Animation Play

Sodium cation Animation Play

Sodium cation Whiteboard exercise Play

Sodium cation Student activity Play

Sodium channels open Animation Play