Relative abundance of isotopes and mass spectra Student activity Play

Relative atomic mass of magnesium Whiteboard exercise Play

Reversible and irreversible reactions Student activity Play

Rocks originating from magma Animation Play

Role of cations in plant cells Slideshow Play

Role of macro-elements absorbed as cations Student activity Play

Salts of s-block elements occurring in nature Slideshow Play

Seawater 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

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

Standard enthalpy of combustion Student activity Play

Standard enthalpy of formation for ionic compounds Whiteboard exercise Play

Standard enthalpy of formation for ionic compounds Student activity Play

Statements about extraction of metals Whiteboard exercise Play

Stoichiometric calculations Student activity Play

Structure of oxides Student activity Play

Substances essential for the growth of plants Student activity Play

Testing for hydrogen Student activity Play

The beginnings of life Student activity Play