The equation shows that ammonium chloride (a white solid ... The white solid turns blue in the presence of water. A similar reversible reaction takes place between anhydrous cobalt(II) chloride ...

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 ...

ammonium nitrate and ammonium sulfate – can be identified by heating a solution of the ions with sodium hydroxide. This reaction produces ammonia gas, as shown in the ionic equation below: ...

The building blocks of life on Earth may have been fueled by tiny sparks hopping between water droplets. Four billion years ...

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 ...

T here are multiple theories that explain the origin of life on Earth, but one of the most disputed ones was proposed in 1953 when two scientists named Stanley Miller and Harold U ...