Reaction conditions and enthalpy change Slideshow Play

Reaction of iron(III) chloride with potassium iodide Animation Play

Reflection and refraction of light Class activity Play

Reflection and refraction of light Whiteboard presentation Play

Refraction of light Whiteboard presentation Play

Refraction of light Class activity Play

Resistance Slideshow Play

Risk factors for coronary heart disease Student activity Play

Rocks formed from magma and lava Animation Play

Skeletal muscles Animation Play

Skeletal muscles – structure Student activity Play

Slowing down of neutrons Animation Play

Sponges (Porifera) – the simplest invertebrates Student activity Play

Standard enthalpies of formation for elements Chart Play

Standard enthalpy change Student activity Play

Standard enthalpy of formation Student activity Play

Standard enthalpy of formation Animation Play

Standard entropy values Animation Play

State at room temperature Student activity Play

State at room temperature Illustration Play

Strength Student activity Play

Structure of a nerve Slideshow Play

Structure of a skeletal muscle Slideshow Play

Structure of a skeletal muscle fibre Slideshow Play

Structure of sponges Slideshow Play