Reactions with water Student activity Play

Reactivity of Group 1 and 2 metals Animation Play

Reactivity series Student activity Play

Recognising reducing agents Student activity Play

Recognising reducing agents 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

Regulation of salt balance – the role of aldosterone Student activity Play

Regulation of salt balance – the role of aldosterone Whiteboard exercise Play

Regulation of salt concentration in the organism Slideshow Play

Relationship between the group number and the number of valence electrons 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

Salinity of sea water Animation Play

Salt Whiteboard exercise Play

Salt hydrolysis Student activity Play

Salt hydrolysis Whiteboard exercise Play

Salt hydrolysis Animation Play

Salt water versus fresh water Whiteboard exercise Play

Salt water versus fresh water Student activity Play