Crystal Structures and Unit Cells Quiz

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Questions and Answers

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?

<p>There are 1.16 × 10^24 unit cells and 2.32 × 10^24 atoms present in 200 g of the element.</p> Signup and view all the answers

Distinguish with the help of diagrams metal conductors, insulators, and semiconductors from each other.

<p>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.</p> Signup and view all the answers

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.

<p>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.</p> Signup and view all the answers

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?

<p>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.</p> Signup and view all the answers

What is an impurity defect, what are its types, and explain the formation of vacancies through aliovalent impurity with an example?

<p>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.</p> Signup and view all the answers

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