chemistry

5. one of two or more different molecular forms of an element in the same physical states
6. the smallest group of particles within a crystal that retains the geometric shape of the crystal
7. transparent fusion product of inorganic materials that have cooled to a rigid state without crystallizing

1. the process in which a solid changes to a gas or vapor without passing through the liquid state
2. describes a solid that lacks an ordered internal structure, denotes a random arrangement of atoms
3. diagram a graph showing the conditions of which a substance exists as a solid, liquid, or vapor
4. point the point on a phase diagram that represents the only set of conditions at which all three phases exist in equilibrium with one another