Produced by the Royal Society of Chemistry, this resource aimed at primary level, provides activity ideas, key vocabulary and background knowledge about irreversible changes. Activities explore irreversible reactions which result in a new material which may be useful, such as making plastic with milk and vinegar and erupting a sodium bicarbonate volcano. Other activities look at irreversible reactions which are not useful involving investigating the rusting of materials and the factors which affect this. It also aims to develop key skills including: planning and carrying out a fair test, using equipment accurately observing carefully and recording results. Science poems and a concept cartoon are also provided to promote discussion and develop understanding.