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 ...

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.

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 ...

Students explore the concept that chemical reactions involve the breaking of bonds between atoms in the reactants, and the rearrangement and rebonding of these atoms to make the products. Students ...

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 ...

This is shown by larger energy arrows coming out of the products and smaller energy arrows going into the reactants. In this reaction, the temperature goes down, so it is endothermic. In an ...