Crystallisation

Dr. Franklin introduces the concept of crystal lollipops and explains the dissolution process, highlighting the difference between soluble and insoluble substances. The video covers saturated solutions and how evaporation leads to crystallization, which is used to make crystal lollipops. It explores various crystals, their geometric shapes, and distinguishes them from amorphous substances like glass. The session concludes with a recap and a quiz to reinforce learning.

What happens to sugar when it is mixed with water?

• It becomes invisible but changes the taste of water.

• It sinks to the bottom.

• It turns into a solid block.

• It floats on the surface.

What is a saturated solution?

• A solution that cannot dissolve any more solute.

• A solution that can dissolve more solute.

• A solution that is completely clear.

• A solution that is only partially mixed.

What is the first step in making crystal lollipops?

• Pour water into a beaker and heat it.

• Freeze the solution.

• Add food coloring to water.

• Insert a stick into the solution.

What is the purpose of adding food coloring in the lollipop-making process?

• To make the solution dissolve faster.

• To increase the temperature of the solution.

• To enhance the flavor of the lollipop.

• To make the lollipop bright and colorful.

What is crystallization?

• The process of dissolving crystals in water.

• The process of breaking crystals into smaller pieces.

• The process of forming crystals from a solution.

• The process of melting crystals.

Which of the following is NOT a crystal?

• Snowflake

• Diamond

• Glass

• Salt

What is the internal structure of crystals like?

• Flat and smooth

• Periodic and regular

• Irregular and random

• Curved and wavy

Which of these substances is amorphous?

• Salt

• Glass

• Diamond

• Snowflake

What role do crystals play in the human body?

• They help maintain balance.

• They are responsible for digestion.

• They provide insulation.

• They are used for energy storage.

What is the main difference between crystals and amorphous substances?

• Amorphous substances are always colored.

• Crystals have a periodic internal structure.

• Amorphous substances have a regular structure.

• Crystals are always transparent.