Demonstrate changes of state using volume differences

The true difference in volume between gases and liquids is hard to capture with illustrations alone, and is an important factor for learners to be aware of in developing their knowledge of states of matter and practical chemistry. The balloon in a bottle demonstration clearly shows the difference in volume between a gas and a liquid and highlights the practical considerations learners should have around gases in a reaction. Surprise your 11–14 learners with this quick and memorable practical using ammonia and water.