The temperature on the thermometer has fallen, meaning it is an endothermic reaction. When ammonium chloride powder is mixed with barium hydroxide powder and stirred, a chemical reaction takes place.

Ask students to explain their understanding of exothermic and endothermic reactions in terms of energy changes taking place. This short film will be relevant for teaching chemistry and science in ...

Commercial heat packs (containing iron and water, or supersaturated sodium acetate) and cold packs (various ammonium salts) can be used to show exo- and endothermicity. Heat packs that contain iron ...

Students explore the concept that chemical reactions involve the breaking of bonds ... and cause a color change. Students also explore endothermic and exothermic reactions and do an engineering ...

Two dry solids --- barium hydroxide and ammonium nitrate --- are mixed to produce an endothermic reaction. The temperature of the mixture drops approximately 45oC and is cold enough to freeze the ...

In this reaction, the temperature goes down, so it is endothermic. In an endothermic reaction, more energy goes into breaking the bonds of the reactants than is released when the bonds in the products ...