8 Questions
What is the relationship between density and the edge length of a simple cubic unit cell?
The relationship is that the density is calculated using the formula: density = mass / volume, and the volume of a simple cubic unit cell is calculated as edge length cubed.
Calculate the molar mass of a substance given its density and edge length of the cubic unit cell.
The molar mass can be calculated using the formula: molar mass = (density * (edge length^3)) / Avogadro's number
What is the nature of the cubic unit cell? (fcc or ccp)
The nature of the cubic unit cell is face-centered cubic (fcc).
How many unit cells and number of atoms are present in 200 g of an element with a bcc structure and a unit cell edge length of 288 pm?
There are 1.16 × 10^24 unit cells and 2.32 × 10^24 atoms present in 200 g of the element.
Distinguish with the help of diagrams metal conductors, insulators, and semiconductors from each other.
Metal conductors have a large number of free electrons, insulators have almost no free electrons, and semiconductors have a moderate number of free electrons which increases with temperature.
What are n-type semiconductors and why is the conductivity of doped n-type semiconductor higher than that of pure semiconductor? Explain with a diagram.
N-type semiconductors are those doped with elements that provide extra electrons, increasing the conductivity. The presence of extra electrons due to doping allows for higher conductivity.
Explain with a diagram the Frenkel defect. What are the conditions for its formation and its effect on the density and electrical neutrality of the crystal?
The Frenkel defect occurs when an ion leaves its original site and occupies an interstitial position. It does not affect the density or electrical neutrality of the crystal.
What is an impurity defect, what are its types, and explain the formation of vacancies through aliovalent impurity with an example?
An impurity defect is when foreign atoms occupy the lattice points of the host crystal. Types include substitutional and interstitial defects. Vacancies can be formed through aliovalent impurity, for example, Ag+ in NaCl.
Test your knowledge on crystal structures and unit cells with this quiz. Explore questions related to the relationships between unit cell parameters, molar mass calculations, and the nature of cubic unit cells (fcc or ccp).
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