Crystalline Material Structure
Crystals are material that have a defined melting point. They are solids. There moleculer organisation is also very regular. Its as if some placed them up so they can save space some how.
There are various kinds of shapes they can have:
- Cubic
- Octahedral
- Prismatic
The Arrangements
The reason is due to that they are composed of ionic bonds and share electrons to balance positive and negative charges.
In NaCl each Na is surrounded by six Cl and each Cl is surrounded by six Na. This forms a cubic structure.
Crystals are usually soluble. When they contain some water they form water of crystallization. A water of crystallization is a molecule of water attached the salt when it is crystallized out of water.
Crystals can possess short or long range order.
Amorphous Substances
These are substances that don't have a defined melting point.
Some examples are:
- Glass
- Plastic
- Iron
Amorphous substances have no order whatsoever whether short or long range.
When melting the molecules break bonds within a range of temperature instead of at one definite temperature.
This is because of the way their bonds are set.
Crystals can be hydrated or form a water of crystallization. They attach to their molecules an integral molecule of water.
No comments:
Post a Comment