Thermal Properties of Matter

The figure shows how the temperature of a solid material changes as it is heated.
What are the states of matter at region B?

• solid
• liquid
• solid and liquid
• liquid and gas

The graph shows how the temperature of wax changes as it cools from liquid to solid.
What is the melting point of the wax? 

• 65
• 79
• 81
• 85

Which of the following is true when water is heated from 20^oC to 50^oC?

• Potential energy of the water particles increase
• Kinetic energy of the water particles increase
• Potential energy of the water particles decrease
• Kinetic energy of the water particles decrease

What is the process when gas changes to liquid?

• melting
• boiling
• condensation
• freezing

Which of the following is NOT a difference between boiling and evaporation?

• one is fast while the other is slow
• one occurs throughout the liquid while the other only on the surface
• one occurs at a fixed temperature while the other at any temprature
• one has lots of bubbles formed while the other has a few bubbles formed