Crystal Structures

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which type of crystal lacks a well-defined arrangement and long-range molecular order?

Crystalline
Amorphous (correct)
Quartz
Rubber

What is the main difference between crystalline and amorphous crystals?

Crystalline crystals have similar physical properties in all directions, while amorphous crystals have different physical properties depending on the direction.
Crystalline crystals have sharp melting points, while amorphous crystals melt over a wide range of temperature.
Crystalline crystals have definite shapes and geometrical forms, while amorphous crystals do not have geometrical shapes. (correct)
Crystalline crystals have irregular surfaces when cut, while amorphous crystals have plane surfaces.

Which type of crystal has atoms, molecules or ions occupying specific positions forming a 'lattice structure'?

Crystalline (correct)
Rubber
Amorphous
Quartz

Which type of crystal has flat faces and distinct angles?

<p>Crystalline (D)</p> Signup and view all the answers

Which type of crystal has mechanical and electrical properties that depend on the direction along which they are measured?

<p>Crystalline (C)</p> Signup and view all the answers

Flashcards

Amorphous Crystal

A type of crystal that doesn't have a specific arrangement or long-range order of atoms. It lacks a regular, repeating pattern.

Crystalline Crystal

Crystals whose atoms, molecules or ions are arranged in a repeating, three-dimensional pattern called a lattice structure.

Crystalline vs. Amorphous

The main distinction between crystalline and amorphous solids is their internal structure. Crystalline solids exhibit a highly ordered, repeating structure (lattice), while amorphous solids possess a disordered and irregular arrangement of molecules.

Characteristics of Crystalline Crystals

Crystals are known for their distinct, geometric shapes with flat faces and specific angles. This is a defining characteristic of crystalline materials.

Signup and view all the flashcards

Anisotropy in Crystalline Crystals

Crystalline materials show anisotropic behavior, meaning their mechanical and electrical properties vary depending on the direction of measurement. This is due to the ordered arrangement of particles in their structure.

Signup and view all the flashcards

Study Notes

Types of Crystals

Amorphous crystals lack a well-defined arrangement and exhibit no long-range molecular order.
Crystalline crystals have a regular, repeating arrangement of atoms, molecules, or ions forming a distinct lattice structure.

Differences between Crystalline and Amorphous Crystals

Crystalline crystals have a specific, orderly geometric arrangement, while amorphous crystals do not have long-range order or a defined shape.
The mechanical and electrical properties of crystalline materials depend on the measurement direction, unlike amorphous materials that display isotropic properties.

Characteristics of Crystalline Structures

Crystalline crystals possess flat faces and distinct angles, reflecting their geometric arrangement.
Atoms, molecules, or ions in crystalline crystals occupy specific positions, establishing a lattice structure that defines their spatial organization.