A brief history of the electron microscope Slideshow Play

A circuit junction Animation Play

A close look at current Student activity Play

A close look at current Animation Play

A covalent bond in a hydrogen molecule Animation Play

A microscopic image Student activity Play

A microscopic image Whiteboard exercise Play

A molecule of ethene Animation Play

A molecule of methanamine Animation Play

A p-n junction Student activity Play

A p-n junction Animation Play

A p-n junction Whiteboard exercise Play

A permanently charged body Animation Play

A shared electron pair Animation Play

A simplified transistor Animation Play

Absorbed dose and dose equivalent Student activity Play

Absorption spectra Student activity Play

Acidic oxides Animation Play

Acidic properties Student activity Play

Acidity reaction (hydrolysis) of metal ions Student activity Play

Addiction reaction Animation Play

Addition of bromine to alkenes Animation Play

Addition of elements to alkenes Student activity Play

Addition of hydrogen cyanide Student activity Play

Addition of hydrogen cyanide Animation Play