The chemist's counting unit – the mole Student activity Play

The early theory of atoms by Democritus Animation Play

The effect of acid rains on environment Animation Play

The effect of sulphur dioxide on plants Slideshow Play

The effect of sulphur dioxide on the process of corrosion Slideshow Play

The elements of life Student activity Play

The elements of life Student activity Play

The elements of life Chart Play

The enthalpy change for the transformation of solid sulphur into gaseous sulphide ions Whiteboard exercise Play

The formation of aluminium sulphide: calculations Animation Play

The formation of ionic compounds is exothermic Animation Play

The impact of air pollutants on the environment Student activity Play

The importance of chemical reactions Student activity Play

The importance of mineral ions Student activity Play

The law of conservation of mass Animation Play

The mass proportion of atoms in copper(I) sulphide Animation Play

The molar mass of sulphur dioxide Whiteboard exercise Play

The mole Student activity Play

The mole Whiteboard exercise Play

The nature of chemical reactions Student activity Play

The percentage of biogenic elements in the human organism Illustration Play

The reaction between sulphur dioxide and chlorine in an aqueous Animation Play

The strength of carbon–carbon bond Animation Play

The structure of the periodic table – groups Whiteboard exercise Play

The structure of the periodic table – groups (2) Student activity Play