The French use the word chateau for castle but it used to cover both: the Chateau-Gaillard, a fortress of the 12th century; and the manors dating from the 12th to the 18th century, which have no or little defensive capability.he French use the word chateau for castle but it used to cover both: the Chateau-Gaillard, a fortress of the 12th century; and the manors dating from the 12th to the 18th century, which have no or little defensive capability.
Hydrate, any compound containing water in the form of H2O molecules, usually, but not always, with a definite content of water by weight. The best-known hydrates are crystalline solids that lose their fundamental structures upon removal of the bound water.
Other solid compounds contain larger amounts of water that ischemically bound in the crystal. These compounds are usually ionic salts. The water that is present inthese salts is called water of hydration and is usually bound to the cations in the salt.The water molecules in a hydrate are removed relatively easily.ther solid compounds contain larger amounts of water that ischemically bound in the crystal. These compounds are usually ionic salts. The water that is present inthese salts is called water of hydration and is usually bound to the cations in the salt.The water molecules in a hydrate are removed relatively easily.