
Endothermic Reaction

by Science Photo Library
Title
Endothermic Reaction
Artist
Science Photo Library
Medium
Photograph - Photograph
Description
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).
Uploaded
October 7th, 2018
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