Thermal Expansion and Properties of Matter

The video tutorial demonstrates various experiments illustrating the principles of expansion and water resistance. It includes creating a soap bubble cube, changing an egg's appearance with a candle, testing cocoa powder's water resistance, moving an egg into a bottle using thermal expansion, observing liquid expansion, and demonstrating solid expansion with heat.

What shape is created when soap bubbles combine inside the cube structure?

• A sphere

• A pyramid

• A cube

• A cylinder

What happens to the soap bubble structure when dipped again in soapy water?

• It remains unchanged

• It forms a smaller cube inside

• It collapses

• It forms a single large bubble

What is the purpose of heating the egg over a candle flame?

• To melt the egg

• To make the egg black with soot

• To make the egg transparent

• To cook the egg

What change is observed when the blackened egg is placed in water?

• It becomes silver and water-repellent

• It dissolves

• It sinks to the bottom

• It turns white

What happens when cocoa powder is submerged in water?

• It dissolves completely

• It changes color

• It forms a paste

• It remains dry inside

Why does the cocoa powder remain dry inside when submerged in water?

• It is too dense

• It has a protective outer layer

• It is waterproof

• It repels water

How is the egg pulled into the bottle without using hands?

• By shaking the bottle

• By heating the bottle

• By creating a vacuum

• By cooling the egg

What principle is demonstrated by the egg being pulled into the bottle?

• Magnetic attraction

• Thermal expansion of gases

• Chemical reaction

• Gravitational pull

What happens to the water level in the straw when the bottle is heated?

• It evaporates

• It stays the same

• It increases

• It decreases

Why do engineers leave gaps in bridges?

• To improve aesthetics

• To reduce weight

• To allow for thermal expansion

• To save materials