Questions and Answers
Which type of bond is responsible for holding the atoms together in a covalent crystal?
Covalent bond
What type of crystal possesses a flat, hexagonal sheet that can slide across one another, making it slippery to touch?
Covalent crystal
Why do ionic compounds not conduct electricity in their solid state?
The ions are not mobile in the solid state
Which type of crystal has sharp melting points and heat of fusions due to its definite packing and symmetrical structures?
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What type of force is responsible for holding molecules together in a molecular crystal?
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Which type of solids can be classified based on the arrangement of particles?
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What do metal atoms resemble when considering their packing efficiency in crystalline solids?
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What do experiments on crystal structure reveal about the packing of atoms in solids?
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What is the purpose of calculating the packing efficiency for different lattices in crystalline solids?
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In which types of crystalline lattices will this unit focus on describing the arrangement of atoms?
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Study Notes
Covalent Crystals
- Covalent bonds are responsible for holding atoms together in a covalent crystal.
Layered Crystals
- Layered crystals possess a flat, hexagonal sheet that can slide across one another, making them slippery to touch.
Ionic Compounds
- Ionic compounds do not conduct electricity in their solid state.
Crystalline Solids
- Crystalline solids have sharp melting points and heat of fusions due to their definite packing and symmetrical structures.
Molecular Crystals
- Intermolecular forces are responsible for holding molecules together in a molecular crystal.
Classification of Solids
- Solids can be classified based on the arrangement of particles.
Metal Atom Packing
- Metal atoms resemble spheres when considering their packing efficiency in crystalline solids.
Crystal Structure Experiments
- Experiments on crystal structure reveal the packing of atoms in solids.
Packing Efficiency
- Calculating the packing efficiency for different lattices in crystalline solids is important to understand the arrangement of atoms.
Crystalline Lattices
- This unit focuses on describing the arrangement of atoms in face-centered cubic (FCC), body-centered cubic (BCC), and hexagonal close-packed (HCP) crystalline lattices.
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