Multiple Choice
Compound A is hard, doesn't conduct electricity, and melts at 1400ºC. Compound A represents which of the following:
12. Liquids, Solids, and Intermolecular Forces
Atomic, Ionic and Molecular Solids
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As it cools off, olive oil slowly hardens and forms a solid over a range of temperatures. Which best describes it as a solid?
A
Ionic
B
Covalent Network
C
Metallic
D
Amorphous
E
Molecular Crystals
Verified step by step guidance1
Understand the types of solids: Ionic solids are composed of ions and have high melting points. Covalent network solids consist of atoms connected by covalent bonds in a continuous network. Metallic solids are composed of metal atoms with a 'sea of electrons'. Amorphous solids lack a well-defined structure.
Recognize that olive oil is an organic compound primarily made up of triglycerides, which are large molecules.
Consider the properties of molecular crystals: They are composed of molecules held together by intermolecular forces such as van der Waals forces, hydrogen bonds, or dipole-dipole interactions.
Note that molecular crystals typically have lower melting points and are often soft, which aligns with the behavior of olive oil as it cools and hardens over a range of temperatures.
Conclude that olive oil, when solidified, is best described as forming molecular crystals due to its composition and the nature of the forces holding the molecules together.
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