Reynolds experiment – laminar flow vs. turbulent flow Student activity Play

Reynolds experiment – laminar flow vs. turbulent flow Animation Play

Reynolds experiment – laminar flow vs. turbulent flow Whiteboard exercise Play

Roentgen's experiment Animation Play

Role of cations in plant cells Slideshow Play

Role of macro-elements absorbed as cations Student activity Play

Rolling a die Animation Play

Rolling the die Whiteboard exercise Play

Rutherford's experiment Animation Play

Rutherford's experiment Animation Play

Rutherford's experiment Animation Play

Rutherford's experiment Whiteboard exercise Play

Salts of carboxylic acids Student activity Play

Sample compounds Slideshow Play

Sample formulae Illustration Play

Sampling Whiteboard presentation Play

Sampling Class activity Play

Saturated and unsaturated compounds Animation Play

Sea water Student activity Play

Sea water game Whiteboard exercise Play

Selected compounds with three or more elements Whiteboard exercise Play

Semi-conservative replication of DNA Student activity Play

Simple and giant molecular solids Whiteboard presentation Play

Simple and giant molecular solids Class activity Play

Smoking and ciliary cells Animation Play