Multiple Choice
Which of the following postulates of Dalton's atomic theory is NOT considered true based on modern scientific understanding?
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2. Atoms & Elements
Atomic Theory
Multiple Choice
Which of the following is a covalent network solid formed from carbon?
A
Diamond
B
Graphite
C
Carbon dioxide (CO_{2})
D
Buckminsterfullerene (C_{60})
Verified step by step guidance1
Understand the concept of a covalent network solid: it is a structure where atoms are bonded by a continuous network of covalent bonds extending throughout the material, resulting in a very hard and high melting point solid.
Analyze each option to determine if it forms a covalent network solid:
Diamond: Each carbon atom is tetrahedrally bonded to four other carbon atoms in a 3D network, forming a strong covalent network solid.
Graphite: Carbon atoms are bonded in layers with strong covalent bonds within layers but weak van der Waals forces between layers, so it is not a 3D covalent network solid but a layered structure.
Carbon dioxide (CO_{2}): It is a molecular solid composed of discrete molecules held together by weak intermolecular forces, not a covalent network solid.
Buckminsterfullerene (C_{60}): It consists of discrete spherical molecules held together by weak intermolecular forces, not a continuous covalent network.
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