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Multiple Choice
Which of the following is a crystalline solid?
A
Glass
B
Polyethylene
C
Sodium chloride (NaCl)
D
Rubber
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1
Understand the definition of a crystalline solid: it is a solid material whose atoms, ions, or molecules are arranged in an orderly, repeating pattern extending in all three spatial dimensions.
Evaluate each option based on its structure: Glass is an amorphous solid, meaning it lacks a long-range ordered structure.
Polyethylene and rubber are polymers that typically form amorphous or semi-crystalline solids, but generally do not have a well-defined crystalline lattice like ionic solids.
Sodium chloride (NaCl) is an ionic compound that forms a highly ordered, repeating lattice structure, characteristic of crystalline solids.
Therefore, identify Sodium chloride (NaCl) as the crystalline solid because it has a regular, repeating arrangement of ions in a crystal lattice.