Plaster of Paris, Deliquescence and Efflorescence

The video tutorial explores the fascinating world of hydrates, compounds that incorporate water into their crystal structure. It explains how substances like copper sulfate change color when hydrated or dehydrated. The video also delves into gypsum and its transformation into plaster of Paris, a material with various practical applications. Additionally, it covers hygroscopic substances like silica gel, which absorb moisture from the air, and deliquescent substances that dissolve in absorbed moisture, using everyday examples like instant coffee.

What happens to hydrated copper sulfate when it is heated?

• It dissolves in water.

• It becomes an anhydrous white powder.

• It remains unchanged.

• It turns into a blue liquid.

What is the process called when salts lose their water of crystallization to the atmosphere?

• Sublimation

• Hydration

• Efflorescence

• Deliquescence

What is plaster of Paris primarily used for?

• Cooking

• Building roads

• Waterproofing

• Immobilizing broken bones

What is the main function of silica gel in packaging?

• To provide fragrance

• To absorb moisture

• To act as a cushion

• To add weight

Which of the following is a hygroscopic compound?

• Iron oxide

• Copper sulfate

• Sodium chloride

• Calcium oxide

What is the term for substances that absorb moisture and dissolve in it?

• Efflorescent

• Hygroscopic

• Deliquescent

• Hydrated

What everyday item can demonstrate deliquescence?

• Baking soda

• Table salt

• Instant coffee

• Sugar