Endothermic reaction

Endothermic reaction

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This image is part of the sequence Science and technology: Endothermic reaction


Caption: Sequence of shots showing an endothermic reaction. At top left solid barium hydroxide and solid ammonium chloride have been place in a flask that is sitting on a damp piece of wood. The digital thermometer shows the temperature in the flask to be 21 degrees Celsius. As the two chemicals are mixed an endothermic, or heat-absorbing, reaction takes place and the temperature inside the beaker drops dramatically. This drop in temperature freezes the water between the flask and wooden block, sticking the two together (bottom right).

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Keywords: 4, ammonium chloride, apparatus, barium hydroxide, chemical, chemistry, demonstrating, demonstration, digital thermometer, endothermic, energetic, energy, enthalpy change of solution, equipment, experiment, flask, four, freezing, frozen, heat-absorbing, lab, laboratory, mixing, mixture, one person, quartet, reacting, reaction, school science, science education, sequence, slush, solid-solid reaction, studio shot, thermodynamics

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