Regulation of blood calcium concentration Animation Play

Regulation of blood calcium level Whiteboard exercise Play

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

Removing the impurities of iron ores Animation Play

Reversible and irreversible reactions Student activity Play

Reversible reactions 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 s-block elements occurring in nature Slideshow Play

Seawater Slideshow Play

Selected physical properties of oxides Chart Play

Shells Slideshow Play

Silicon and aluminium oxides Animation Play

Sodium, magnesium and aluminium oxides Animation Play

Soil Student activity Play

Soil as a source of minerals Student activity Play

Solubility curve for calcium hydroxide Whiteboard exercise Play

Solution of calcium hydroxide Illustration Play

Sorting metals by their reactivity with oxygen Whiteboard exercise Play

Sources of calcium Slideshow Play

Sources of nutrients Student activity Play

Sources of nutrients Whiteboard exercise Play

Specific gravity Student activity Play