Reactivity series Student activity Play

Redox reactions Animation Play

Regulation of blood calcium concentration Student activity Play

Regulation of blood calcium concentration Animation Play

Regulation of blood calcium level Whiteboard exercise Play

Relation between enthalpy of solution and enthalpy of hydration Whiteboard exercise Play

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

Rocks originating from magma Animation Play

Role of calcitonin Slideshow Play

Role of cations in plant cells Slideshow Play

Role of macro-elements absorbed as cations Student activity Play

Salts of carboxylic acids Student activity Play

Salts of s-block elements occurring in nature Slideshow Play

Salts of strong acids and weak bases Student activity Play

Salts of weak acids and strong bases Student activity Play

Seawater Slideshow Play

Shells Slideshow Play

Simplified rules of electrode reactions Animation Play

Sodium cation Animation Play

Sodium cation Whiteboard exercise Play

Sodium cation Student activity Play

Sodium hydroxide Animation Play

Soil Student activity Play

Soil as a source of minerals Student activity Play

Solubility curve for calcium hydroxide Whiteboard exercise Play