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.
An example of a hydrate is magnesium sulfate. Its formula is MgSO4 â 7H2O, indicating that seven moles of water are combined with one mole of magnesium sulfate in the crystalline form. In this investigation you will be given an unknown hydrate and asked to determine the percent of water in the compound.