Ammonia Animation Play

Amorphous solids Student activity Play

An atom and a nucleus Whiteboard exercise Play

An atom and a nucleus Student activity Play

An atom and a nucleus Animation Play

An electron-proton pair Animation Play

An explosion of atom bomb Illustration Play

Anaerobic respiration Student activity Play

Anaerobic respiration Slideshow Play

Antiparticles – matter and antimatter Whiteboard exercise Play

Antiparticles – matter and antimatter Student activity Play

Application of inhibitors Animation Play

Application of radioactive isotopes Student activity Play

Application of the Würtz synthesis Animation Play

Aquatic plants Student activity Play

Are all atoms of the same element identical? Student activity Play

Arrangement of chemical elements in the periodic table Student activity Play

Arterioles and capillaries Student activity Play

Assigning electrons to atomic orbitals Student activity Play

Assimilation of food Student activity Play

Atmospheric carbon dioxide Student activity Play

Atmospheric carbon dioxide Animation Play

Atom bomb Student activity Play

Atom bomb Whiteboard exercise Play

Atom – the basic component of matter Animation Play