There are many difference between a solids, liquids, and gases... Lets take a example: like water.
Water is a unversal solvent and the most basic and the most easiest and not so complicated when you go to the molecular level. Water's formula is H2O. So, there are 2 hydrogens and one oxygen. When you freeze water its molecular structure is very different from its liquid form or its gas form. This is because its structure has more of a symictrical form and has a more standared form which is composed, has no space left to have free space, and also there are no molecules floting around randomly, If you know what i mean... (solid molecules are held together through the attractions caused by each molecule being slightly polar) and in liquids there is a little less attraction from each molecule and then when there is a gas there is almost no attraction between molecules causing it to float everywhere.
Hint:--- Look at a solid... Does the solid move unless you make it make someway or another... There is more attraction in solids than in liquids and gasses. Liquids dont have much movement as well but there are more easilly moved. Gasses move like crazy. They dont have any attraction or less attraction between them leading to the free movement and create no form or almost no form at all.
This is why solids, liquids, and gasses differ from on another at the molecular level. What I just said is the most brefest summery of how they differ. There are many differences like the polars and the non-polars, and etc...
good luck@@@
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