Science / Geology / Zeolite: A group of hydrous aluminosilicates that are similar to the feldspars. They easily lose and regain their water of hydration and they fuse and swell when heated. Zeolites are frequently used in water softening, ion exchange and absorbent applications.
Science / Periodic Table of Elements / Lanthanum (La): Atomic number: 57, Atomic mass: 138.91 g.mol -1, Electronegativity: 1.1, Density: 6.18 g.cm-3 at 20°C, Melting point: 826 °C, Boiling point: 0.186 nm, Vanderwaals radius: 0.104 nm (+3), Isotopes: 7, MORE
Science / Chemistry / Water Softener: A material that lowers water hardness when dissolved in water. For example, sodium carbonate ('washing soda') softens water by precipitating Ca2+ ions as caco3. Zeolites soften water by exchanging Ca2 MORE
Science / Chemistry / Molecular Sieve: A material that contains many small cavities interconnected with pores of precisely uniform size. Zeolites are an example. Molecular sieves adsorb molecules that are small enough to pass through their MORE