Algebraic method Animation Play

Alkanes Student activity Play

Alkyl groups Student activity Play

Alkyl groups as side substituents Animation Play

Ammonia Animation Play

Ammonia Student activity Play

Ammonia molecule Illustration Play

Antiparticles Animation Play

Antiparticles – matter and antimatter Student activity Play

Applications of hydrogen Illustration Play

Arrangement of chemical elements in the periodic table Student activity Play

Arterioles and capillaries Student activity Play

Atomic masses in the periodic table Student activity Play

Atomic number Student activity Play

Atomic number Animation Play

Atomic number and mass number Student activity Play

Atomic numbers and mass numbers of the elements Animation Play

Atomic radii of the s-block elements Student activity Play

Atomic spectrum of hydrogen Whiteboard exercise Play

Atomic spectrum of hydrogen Student activity Play

Atomic spectrum of hydrogen Student activity Play

Atoms and compounds Student activity Play

Atoms, nucleons and electrons Whiteboard exercise Play

Atoms, nucleons and electrons Student activity Play

Autotrophism in plants Student activity Play