Reagents, reactants and products Student activity Play

Redox reactions Animation Play

Relationship between the atomic structure and the position of elements in periods Animation Play

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

Relative abundance of isotopes and mass spectra Student activity Play

Relative atomic mass of magnesium Whiteboard exercise Play

Respiration in plants Whiteboard presentation Play

Reversible and irreversible reactions Student activity Play

Rocks originating from magma Animation Play

Role of anions in plant cells Slideshow Play

Role of cations in plant cells Slideshow Play

Role of macro-elements absorbed as anions Student activity Play

Role of macro-elements absorbed as cations Student activity Play

Salts of s-block elements occurring in nature Slideshow Play

Seawater Slideshow Play

Silver nitrate Slideshow Play

Sodium, magnesium and aluminium oxides Animation Play

Soil Student activity Play

Soil as a source of minerals Student activity Play

Soil fertility; fertilization and types of fertilizers Student activity Play

Solubility of salts Student activity Play

Sorting metals by their reactivity with oxygen Whiteboard exercise Play

Standard enthalpies of combustion for selected substances Chart Play

Standard enthalpy of atomisation Student activity Play

Standard enthalpy of atomisation of metals Animation Play