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In chemistry, a hydrate is a substance that contains water or its constituent elements. The chemical state of the water varies widely between different classes of hydrates, some of which were so labeled before their chemical structure was understood.
A salt with associated water of crystallization is known as a hydrate. The structure of hydrates can be quite elaborate, because of the existence of hydrogen bonds that define polymeric structures. [ 3 ] [ 4 ] Historically, the structures of many hydrates were unknown, and the dot in the formula of a hydrate was employed to specify the ...
In chemistry, a hemihydrate (or semihydrate) is a hydrate whose solid contains one molecule of water of crystallization per two other molecules, or per two unit cells.This is sometimes characterized as a solid that has one "half molecule" of water per unit cell. [1]
Fiber is an important nutrient with many health benefits, and research shows that it can play an important role in supporting a long, healthy life. One study found that high fiber intake reduced ...
These applications exploit the fact that calcium sulfate which has been powdered and calcined forms a moldable paste upon hydration and hardens as crystalline calcium sulfate dihydrate. It is also convenient that calcium sulfate is poorly soluble in water and does not readily dissolve in contact with water after its solidification.
If the hydration energy is greater than the lattice energy, then the enthalpy of solution is negative (heat is released), otherwise it is positive (heat is absorbed). [3]The hydration energy should not be confused with solvation energy, which is the change in Gibbs free energy (not enthalpy) as solute in the gaseous state is dissolved. [4]
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This was later followed by The 6 Most Important Decisions You Will Ever Make: A Guide for Teens (2006), which highlights key times in the life of a teen and gives advice on how to deal with them, and The 7 Habits of Happy Kids (2008), a children's book illustrated by Stacy Curtis that further simplifies the 7 habits for children and teaches ...