All flashcards
Flashcard 1: Identify the structure that graphite is an example of.
Answer: Covalent network solid. Layered structure with delocalized electrons between carbon sheets.
Flashcard 2: Which type of solid can be reshaped by applying force?
Answer: Metallic solids. Delocalized electrons allow layers to slide past each other without breaking bonds.
Flashcard 3: Identify the characteristic property of ionic solids.
Answer: High melting points and electrical conductivity in molten state. Strong ionic bonds require high energy to break and ions become mobile when melted.
Flashcard 4: What type of solid is common table salt an example of?
Answer: Ionic solid. Sodium and chloride ions held together by strong electrostatic forces.
Flashcard 5: What is a distinguishing feature of metallic solids?
Answer: Good electrical and thermal conductivity. Mobile electron sea allows efficient heat and electric current transfer.
Flashcard 6: What is a distinguishing feature of metallic solids?
Answer: Good electrical and thermal conductivity. Mobile electron sea allows efficient heat and electric current transfer.
Flashcard 7: Identify the crystal system where all edges are equal and angles are 90°.
Answer: Cubic system. Three equal axes at right angles define this symmetric crystal system.
Flashcard 8: State the unit cell type for a hexagonal close-packed structure.
Answer: Hexagonal. Six-fold symmetry with layers stacked in ABAB pattern.
Flashcard 9: What is the distinguishing feature of amorphous solids regarding melting?
Answer: No sharp melting point. Random structure softens gradually over a temperature range.
Flashcard 10: What is the feature that distinguishes a crystalline solid at the atomic level?
Answer: Ordered atomic arrangement. Repeating three-dimensional pattern defines crystal structure.
Flashcard 11: State the type of bonding present in covalent network solids.
Answer: Covalent bonding throughout the structure. Extended network of covalent bonds creates very strong structures.
Flashcard 12: Identify the characteristic property of ionic solids.
Answer: High melting points and electrical conductivity in molten state. Strong ionic bonds require high energy to break and ions become mobile when melted.
Flashcard 13: What type of solid is common table salt an example of?
Answer: Ionic solid. Sodium and chloride ions held together by strong electrostatic forces.
Flashcard 14: State the type of bonding present in covalent network solids.
Answer: Covalent bonding throughout the structure. Extended network of covalent bonds creates very strong structures.
Flashcard 15: Identify the characteristic property of ionic solids.
Answer: High melting points and electrical conductivity in molten state. Strong ionic bonds require high energy to break and ions become mobile when melted.
Flashcard 16: What type of solid is common table salt an example of?
Answer: Ionic solid. Sodium and chloride ions held together by strong electrostatic forces.
Flashcard 17: What is a distinguishing feature of metallic solids?
Answer: Good electrical and thermal conductivity. Mobile electron sea allows efficient heat and electric current transfer.
Flashcard 18: Identify the crystal system where all edges are equal and angles are 90°.
Answer: Cubic system. Three equal axes at right angles define this symmetric crystal system.
Flashcard 19: State the unit cell type for a hexagonal close-packed structure.
Answer: Hexagonal. Six-fold symmetry with layers stacked in ABAB pattern.
Flashcard 20: What is the distinguishing feature of amorphous solids regarding melting?
Answer: No sharp melting point. Random structure softens gradually over a temperature range.
Flashcard 21: What is the feature that distinguishes a crystalline solid at the atomic level?
Answer: Ordered atomic arrangement. Repeating three-dimensional pattern defines crystal structure.
Flashcard 22: Which property is common in amorphous solids?
Answer: Lack of long-range order. Random atomic arrangement distinguishes them from ordered crystalline structures.
Flashcard 23: What is the coordination number for a face-centered cubic lattice?
Answer:
- Each atom contacts twelve others in this close-packed structure.
Flashcard 24: Which type of solid has variable hardness and melting points?
Answer: Metallic solids. Properties depend on specific metal and bonding strength variations.
Flashcard 25: What type of solid is glass considered to be?
Answer: Amorphous solid. Lacks ordered crystalline structure with random atomic arrangement.
Flashcard 26: What is the primary structural feature of graphite?
Answer: Layers of carbon atoms in a hexagonal arrangement. Planar layers allow electrons to move freely within sheets.
Flashcard 27: State the packing efficiency of a simple cubic lattice.
Answer: 52%. Inefficient packing with spheres touching only along cube edges.
Flashcard 28: What is the coordination number in a simple cubic lattice?
Answer:
- Each sphere touches six others along the cube faces and edges.
Flashcard 29: What is the typical electrical conductivity of ionic solids?
Answer: Conductive when molten or dissolved. Ions become mobile charge carriers when lattice breaks down.
Flashcard 30: State the simplest repeating unit in a crystal lattice.
Answer: Unit cell. Smallest portion that shows the complete crystal pattern when repeated.