Chilling effects – a spontaneous endothermic demonstration

It’s easy to find plenty of dramatic demonstrations of exothermic reactions, but most endothermic reactions don’t leave much of an impression. However, a dramatic impression might be needed to shake the misconception some students hold that endothermic reactions cannot occur spontaneously. This is where the solid–solid reactions of barium hydroxide with ammonium salts are useful. […]

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