A change in the state of matter Animation Play

A state of balance Animation Play

Absolute zero Animation Play

Absorption of the photon energy Animation Play

Allotropic forms of crystals Animation Play

Allotropy Student activity Play

Amorphous materials Student activity Play

An isobaric transformation Student activity Play

An isobaric transformation Simulation Play

An isobaric transformation Whiteboard exercise Play

An isochoric transformation Simulation Play

An isochoric transformation Whiteboard exercise Play

An isochoric transformation Student activity Play

An isothermal transformation Simulation Play

An isothermal transformation Whiteboard exercise Play

An isothermal transformation Whiteboard exercise Play

An isothermal transformation Student activity Play

At the surface of water Animation Play

Atomic spectrum of hydrogen Student activity Play

Atomic states Animation Play

Balance Simulation Play

Balance Student activity Play

Balance Whiteboard exercise Play

Balancing equations for redox reactions in acidic solution using half-equations Student activity Play

Bohr's atomic model Student activity Play