which of the following type of solid is most likely to have a low, but well-defined melting point?

Question

amorphous
ionic
network covalent
molecular

Answer 1

Molecular
Amorphous will not be wewll defined.
Ionic will be high
Network covalent (think diamond) won't melt at all.

Answer 2

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.

Answer 3

in case you recommend issues that are stable at room temperature, then caesium (which might soften in the hand in case you have been stupid sufficient to hold it - regrettably it may additionally react explosively with water on your epidermis!) is a sturdy one. Chocolate has a low melting element (between the justifications chocolate feels stable once you consume this is that it melts in the mouth and throat). in case you like yet another ingredient, gallium melts on an fairly heat day.

Answer 4

Molecular solid for example ice is amolecular solid and has definite melting point(273K or O degree celcius.)

Answer 5

Molecular compounds tend to have low, but exact melting points.
Ionic has high mp
amorphous tends to have a nondefined.