Endothermic Reaction

We demonstrate an endothermic reaction by mixing hydrated barium hydroxide with ammonium thiocyanate. When these two solids react they take heat from the surrounding air.

Chemistry - Reactions - Learning Points.
Breaking bonds takes in energy.
Forming bonds releases energy.
Exothermic reactions release more energy than they take in.
Endothermic reactions take in more energy than they release.

A Twig Experiment Film.
Let students experience real experiments in lab conditions anywhere, from setup, method all the way through to analysis and real-world application.