2-D representations of 3-D objects on triangular dotty paper Student activity Play

A folded sheet of paper Animation Play

A hole in a piece of paper Animation Play

A symmetrical triangle on non-squared paper Student activity Play

A symmetrical triangle on squared paper Whiteboard exercise Play

A symmetrical triangle on squared paper Student activity Play

A thickness measuring device Animation Play

Ability to colour litmus blue Animation Play

Ability to colour litmus red Animation Play

Acid-base indicators used in titration Slideshow Play

Acidic oxides Animation Play

Acidic properties of hydrogen halides Student activity Play

Acids (2) Whiteboard exercise Play

Acids (2) Student activity Play

Another base – ammonia Whiteboard exercise Play

Another base – ammonia Student activity Play

Application of enzymes Slideshow Play

Application of radioactive isotopes Student activity Play

Areas of similar figures Student activity Play

Bases (2) Student activity Play

Calcium carbonate Slideshow Play

Cellular catalysts Student activity Play

Cellulose Animation Play

Chemical properties of oxides Student activity Play

Colour change of indicator papers in the presence of acids Animation Play