A rational expression and its simpler form Animation Play

A triple bond Animation Play

A triple bond in ethyne Animation Play

Biological importance of hydrogen bonding Animation Play

Choosing the right optical instrument Whiteboard exercise Play

Constructing right angle triangle Animation Play

Differences in size Student activity Play

Double helix Animation Play

From DNA helix to chromosomes Student activity Play

From DNA helix to chromosomes Whiteboard exercise Play

Habitat and lifestyle of the Roman snail (Helix pomatia) Illustration Play

Hybridisation and multiple bonds Student activity Play

Molecules with three or four covalent bonds Whiteboard exercise Play

Molecules with three or four covalent bonds (2) Student activity Play

Molluscs (phylum Mollusca) Student activity Play

More complicated expressions Student activity Play

Organic chemistry Student activity Play

Organic compounds and life Animation Play

Palindromic sequences Slideshow Play

Proteins and nucleic acids Class activity Play

Proteins and nucleic acids Whiteboard presentation Play

Pythagorean triple Animation Play

Pythagorean triples Student activity Play

Pythagorean triples Whiteboard exercise Play

Restriction enzymes – accurate cuts Student activity Play