The Solid State
NIOS · Class 12 · Chemistry
Flashcards for The Solid State — NIOS Class 12 Chemistry. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allDefine 'solid state' and explain the arrangement of constituent particles in a solid.
Answer
Solid state is one of the three states of matter where constituent particles (atoms, molecules, or ions) are arranged in a closely packed, ordered arrangement with almost no free space between them. T…
Differentiate between crystalline and amorphous solids with examples.
Answer
CRYSTALLINE SOLIDS: (1) Long-range order - particles arranged in regular, repeating 3D pattern; (2) Sharp/definite melting point; (3) Anisotropic - physical properties differ in different directions; …
Name the four types of crystalline solids and state the nature of forces binding their particles.
Answer
Four types of crystalline solids based on binding forces: (1) IONIC SOLIDS - bound by Coulombic/electrostatic forces between ions. Example: NaCl, ZnS. Properties: hard, brittle, high melting point. (2…
What is the melting point of a solid and how does it relate to intermolecular forces?
Answer
Melting point is the temperature at which a solid converts to liquid. It is a characteristic property and indicates purity of a solid. RELATIONSHIP TO INTERMOLECULAR FORCES: Stronger intermolecular fo…
Define crystal lattice and unit cell. How are they related?
Answer
CRYSTAL LATTICE (Space Lattice): A three-dimensional arrangement of points in space where each point represents the position of a constituent particle (atom, molecule, or ion) in the crystal. Shows th…
List the seven crystal systems with their characteristic axes and angles.
Answer
The seven crystal systems are defined by their unit cell parameters (a, b, c are edge lengths; α, β, γ are angles): (1) CUBIC: a = b = c; α = β = γ = 90°. (2) TETRAGONAL: a = b ≠ c; α = β = γ = 90°. (…
Calculate the number of atoms in a simple cubic unit cell and explain how corner atoms are shared.
Answer
SIMPLE CUBIC UNIT CELL: Has atoms only at the 8 corners of the cube. CALCULATION: - Number of corner atoms = 8 - Each corner atom is shared by 8 adjacent unit cells (one for each of 8 corners meeting …
Calculate the number of atoms in a body-centered cubic (BCC) unit cell.
Answer
BODY-CENTERED CUBIC (BCC) UNIT CELL: Has atoms at 8 corners AND 1 atom at the body center. CALCULATION: - Number of corner atoms = 8 - Contribution of each corner atom = 1/8 (shared by 8 unit cells) -…
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