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 ...

And there’s an endothermic reaction in cold packs that help when you ... The beaker now contains sodium chloride and water. The temperature on the thermometer has risen, meaning it is an ...

A small piece of sodium metal is placed in a flask of chlorine gas. A little water helps expose the sodium so it can react with the chlorine gas. The reaction releases a lot of heat as the ionic ...

The solution will crystallize as it touches the crystal, resulting in an increasingly tall tower of sodium acetate. Mix 175g of NaOAc trihydrate with 50mL distilled water in a very clean 500mL ...

From early ocean dips to ice-cold polar plunges, cold-water immersion is increasingly popular among athletes and wellness warriors. But how much of the hype is backed by science?