Which of the following type of solid is most likely to have a low, but well-defined melting point?
ionic
network covalent
molecular
Answer:
Molecular
Amorphous will not be wewll defined.
Ionic will be high
Network covalent (think diamond) won't melt at all.
Molecular solid for example ice is amolecular solid and has definite melting point(273K or O degree celcius.)
I do not understand your question completely. You have asked to compare all sorts of different things. Ionic, Covalent are 2 divisions of a types of classification of materials (i.e based on their bonding). Amorphous in another type of classification based on the arrangement of atoms/molecules and molecular is completely different concept- groups of atoms together make a molecule. Ionic and covalent materials can be both molecular and amorphous. So to answer your question (what I think you meant) - MP depends on how strong the bonding between the molecules are..for a really strong bond like covalent (ex- diamond) it is high and well defined and is lower for Ionic materials (ex-NaCl-common salt). The 3rd strong bond is metallic (ex- iron, copper etc) which has MP lower than ionic. For other weak bonded materials like Hydrogen bonded, Vander waals bonding, the MPs are very low (ex- plastics).
All these materials are molecular i.e comprises of molecules of say iron or copper. These may be different crystalline state (i.e arrangement of atoms) in which case it is called crystalline. In some cases materials do not have any particular sequence for arrangement of molecules they are then called amorphous (non-crystalline) like glass, polymer.
I hope I cleared some of your doubts. Look up an oline encylopedia-wikipedia or even better your chem textbook for the exact information.
Molecular compounds tend to have low, but exact melting points.
Ionic has high mp
amorphous tends to have a nondefined.
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