You are given a gray substance that melts at 700 °C; the solid is a conductor of electricity and is insoluble in water. Which type of solid (molecular, metallic, covalent-network, or ionic) might this substance be?
Ch.12 - Solids and Modern Materials
Chapter 12, Problem 19b
(b) Now draw a picture that represents an amorphous solid at the atomic level.

1
Understand that an amorphous solid lacks a long-range order, unlike crystalline solids which have a repeating pattern.
Visualize the atoms or molecules in an amorphous solid as being arranged randomly, without a definite pattern or structure.
Imagine the atoms or molecules as being closely packed together, but not in a regular, repeating lattice.
Consider that the arrangement might resemble a disordered pile of spheres, where each sphere represents an atom or molecule.
Think about how this lack of order affects the properties of the material, such as having no distinct melting point.

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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Amorphous Solids
Amorphous solids are materials that lack a long-range order or a well-defined crystalline structure. Unlike crystalline solids, where atoms are arranged in a highly ordered pattern, amorphous solids have a random arrangement of atoms. This disordered structure affects their physical properties, such as melting point and mechanical strength, making them distinct from their crystalline counterparts.
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Atomic Structure
The atomic structure refers to the arrangement of atoms within a material. In the context of amorphous solids, this structure is characterized by a lack of periodicity, meaning that the positions of atoms do not repeat in a regular pattern. Understanding atomic structure is crucial for visualizing how atoms interact and bond in different types of solids, influencing their overall properties.
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Visual Representation of Solids
Visual representation of solids involves creating diagrams or models that depict the arrangement of atoms in a material. For amorphous solids, this representation typically shows a chaotic and irregular distribution of atoms, contrasting with the orderly lattice seen in crystalline solids. Such visualizations help in understanding the unique properties and behaviors of different solid materials.
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