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.
The solid contains one or more hydrates â salts that crystallize with a definite number of water molecules in each formula unit. For instance, barium chloride dihydrate, BaCl 2 Â· 2H 2 O, is a hydrate containing two molecules of water (water of crystallization) for each BaCl 2 unit.You will heat the solid to drive off the water of crystallization, and from the loss in mass, calculate the percent of water that was present.he solid contains one or more hydrates â salts that crystallize with a definite number of water molecules in each formula unit. For instance, barium chloride dihydrate, BaCl 2 Â· 2H 2 O, is a hydrate containing two molecules of water (water of crystallization) for each BaCl 2 unit.