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What is Crystallisation? Video Lecture | Science Class 7 (Old NCERT)

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1. What is crystallisation?

Crystallisation is a process in which a solid material forms into a well-defined crystal structure. It occurs when a liquid solution or melt cools down and the solute particles come together to form a crystalline solid.

2. How does crystallisation happen?

Crystallisation happens when a liquid solution or melt is cooled down. As the temperature decreases, the solute particles in the solution start to come together and arrange themselves in an ordered, repeating pattern. This process is known as nucleation. The solute particles continue to aggregate and grow into larger crystals until the solution reaches its saturation point.

3. What are some examples of crystallisation in daily life?

Crystallisation can be observed in various aspects of daily life. Some examples include the formation of snowflakes, the crystallisation of sugar syrup to form rock candy, the formation of salt crystals when seawater evaporates, and the growth of crystals in geodes or caves.

4. What are the applications of crystallisation?

Crystallisation has numerous applications in various fields. It is commonly used in the production of pharmaceuticals to obtain pure drug compounds. It is also utilized in the manufacturing of semiconductors, where crystals are grown to create high-quality materials for electronic devices. Additionally, crystallisation plays a crucial role in the purification of chemicals, separation of mixtures, and production of crystals for jewelry and gemstones.

5. What factors affect the process of crystallisation?

Several factors can influence the process of crystallisation. Temperature is a significant factor, as it determines the rate at which crystals form. Cooling the solution slowly allows for larger and well-formed crystals, while rapid cooling results in smaller crystals. Other factors include the concentration of the solute in the solution, the presence of impurities, and the presence of a suitable surface for crystal growth.

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Oct 21, 2025 Last updated

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	Science Class 7 (Old NCERT) 112 videos\|286 docs\|28 tests

Science Class 7 (Old NCERT)

112 videos|286 docs|28 tests

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