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

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 ...

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 ...

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: ...

Four billion years ago, Earth was a chaotic, lifeless world — a fiery hell with spewing volcanoes and meteorite impacts dominating the landscape. The atmosphere was filled with noxious fumes from ...