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21 Cards in this Set
- Front
- Back
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are characterized by an extended three-dimensional arrangement of atoms, ions, or molecules in which the components are generally locked into their positions |
Solids |
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have well-defined edges and faces, diffract x-rays, and tend to have sharp melting points |
Crystalline solids |
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have irregular or curved surfaces, do not give well- resolved x-ray diffraction patterns, and melt over a wide range of temperatures. |
Amorphous solids |
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Crystalline faces: The faces of crystals can intersect at right angles, as in galena (PbS) and pyrite (FeS2), or at other angles, as in quartz.
Cleavage surfaces of an: amorphous solid. |
Important |
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Constituent particles are arranged in a regular fashion containing short range as well as long range order. |
CRYSTALLINE SOLIDS |
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Constituent particles are not arranged in any regular fashion; they may be at the most some short range order. |
AMORPHOUS SOLIDS |
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have definite and regular geometry and have long range as well as short range order of constituent particles. Possess high melting points. |
Crystalline solids |
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They have definite heat of fusion. |
Crystalline solids |
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are very rigid and their molecules cannot be deformed by mild distorting force. Are considered as true solid. |
Crystalline solids |
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display anisotropism. |
Crystalline solids |
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The particles in the constituent are arranged irregularly. They do not have any definite geometry and have short range order.They are devoid of sharp melting points. |
Amorphous solids |
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No external regularity in their form when these amorphous solids are formed. Usually the amorphous solids exhibit irregular cut. |
Amorphous solids |
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Do not possess any particular heat of fusion. |
Amorphous solids |
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Do not exhibit rigidity. Deformation could be done by bending or compressing them.
Are considered as super cooled liquids or also pseudo solids. |
Amorphous solids |
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display isotropism |
Amorphous solids |
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have distinctive internal structures that in turn lead to distinctive flat surfaces, or faces. |
crystals |
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The faces intersect at angles that are characteristic of the substance |
Crystals |
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When cleaved or broken, they produce fragments with irregular, often curved surfaces; and they have poorly defined patterns when exposed to x-rays |
Amorphous solids |
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An amorphous, translucent solid is called a |
glass |
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External forms have regularity when these are formed. They give a clean surface after cleavage with knife. |
Crystalline solids |
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Symmetrical three-dimensional structural arrangements |
Crystal lattice |
