المادة وتركيبها: درجة الانصهار والتصعيد

The video tutorial explains the concepts of fusion and vaporization. It describes the latent heat required to change a substance from solid to liquid (fusion) and from liquid to gas (vaporization) without changing temperature. The tutorial also covers molecular changes during these processes, such as the behavior of water molecules in ice and during boiling.

What is the term for the heat required to change a substance from solid to liquid without changing its temperature?

• Specific heat capacity

• Heat of reaction

• Latent heat of fusion

• Thermal conductivity

During the melting of ice, what happens to the temperature?

• It increases gradually

• It decreases

• It remains constant at 0°C

• It fluctuates

What happens to the molecules of water when it is heated to its boiling point?

• They form a solid

• They slow down

• They move more freely and turn into gas

• They remain in liquid form

What is the boiling point of water in Celsius?

• 0°C

• 50°C

• 150°C

• 100°C

What is the term for the heat required to change a substance from liquid to gas without changing its temperature?

• Latent heat of vaporization

• Latent heat of fusion

• Thermal expansion

• Specific heat capacity