Relative atomic mass Whiteboard presentation Play

Relative molecular mass Student activity Play

Rhombic sulphur (alpha-sulphur) Illustration Play

Roentgen spectra of elements – characteristic radiation Student activity Play

Role of anions in plant cells Slideshow Play

Role of macro-elements absorbed as anions Whiteboard exercise Play

Role of macro-elements absorbed as anions Student activity Play

Rutherford's atomic model Student activity Play

Rutherford's experiment Animation Play

Rutherford's experiment Animation Play

Rutherford's experiment Whiteboard exercise Play

Rutherford's model of the atom Animation Play

Saturated and unsaturated compounds Animation Play

Semiconductor Animation Play

Sensors Animation Play

Separating mixtures Student activity Play

Separating sulphur and water Animation Play

Shapes of organic molecules Student activity Play

Sigma (σ) bond Whiteboard exercise Play

Sigma (σ) bond Student activity Play

Sigma bonds in hydrogen fluoride molecule Animation Play

Silicon, phosphorus and sulphur chlorides Animation Play

Size of matter Student activity Play

Size of the atom Animation Play