The first contains a fine iron powder, salt, and water in a pouch that is permeable to air. When it is exposed to air, the iron begins to rust. This rusting process produces heat. The second contains ...

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 ...