Total entropy change Animation Play

Total internal reflection Student activity Play

Total internal reflection Simulation Play

Total internal reflection Whiteboard exercise Play

TV screens Whiteboard exercise Play

Types of gas changes Student activity Play

Using mean bond enthalpies in calculations. Part 1 Student activity Play

Using the diagrams in real life Whiteboard exercise Play

Water and ice at equilibrium Animation Play

Water solutions of sulphuric acid and sulphurous acid Whiteboard exercise Play

Weight Class activity Play

What affects refraction? Whiteboard exercise Play

What affects refraction? Student activity Play

What affects refraction? Simulation Play

Why does the electronegativity change across a period? Animation Play

Why don't solids change their shape spontaneously? Animation Play

Why ecosystems change Slideshow Play

Work and change in potential energy Animation Play

Work causes a change in energy Whiteboard exercise Play

Work causes a change in energy Simulation Play

Work causes a change in energy Student activity Play

Worked examples Student activity Play

 When a function does not change its sign Animation Play