A state of balance Animation Play

A typical heating curve for a pure substance Illustration Play

Absolute values of entropy Student activity Play

Abundance of chemical elements in nature Student activity Play

Acceleration and force Student activity Play

Action and reaction Student activity Play

Additional information contained in chemical equations Student activity Play

Age-related changes in the human body Slideshow Play

Allotropic forms of crystals Animation Play

Allotropy Student activity Play

Amides and nitriles Student activity Play

Ammonium nitrate Animation Play

Amorphous materials Student activity Play

Amorphous solids Student activity Play

Amorphous solids Whiteboard exercise Play

An electrically neutral body Animation Play

An experiment Student activity Play

An experiment Whiteboard exercise Play

Analysis of the propagation of seismic waves Slideshow Play

Angular momentum Whiteboard presentation Play

Angular momentum Class activity Play

Angular momentum of a solid Student activity Play

Angular momentum of a solid Whiteboard exercise Play

Approximation by rectangles Animation Play

Approximation of the volume of the solid revolution Simulation Play