Phase Diagram and Curve

In which segment is the kinetic energy remaining constant?

• A-B
• B-C
• C-D
• E-F

What line segment represents only the solid state?

• A-B
• B-C
• C-D
• D-E

True or false: melting and freezing occur at the same temperature!

• True
• False
• I don't know

A substance's heating curve is shown in the graph.  What is its boiling point?

• 100 C
• 60 C
• 80 C
• 20 C

Describe the substance between letters D and E. 

• Gas
• Liquid
• Melting
• Evaporating

NaCl(s) was heated up starting at an initial temperature of 0°C. The heating curve is shown in the picture. What is the melting point of this substance?

• 0°C

• 801°C

• 1000°C

• 1465°C

Given the heating curve of water, what is happening to potential and kinetic energy during segment CD?

• the potential energy and kinetic energy both increase

• the potential energy increases while the kinetic energy decreases

• the potential energy is constant while the kinetic energy increases

• the potential energy increases while the kinetic energy is constant

A substance is cooled for sixteen minutes according to the cooling curve shown. What is the melting point of this substance?

• 206°C

• 150°C

• 90°C

• 50°C

A substance is cooled for sixteen minutes according to the cooling curve shown. What phase change is occurring at minute 4?

The theory that states that all particles in matter are constantly moving; helps to describe the phases of matter

• behavior of gases
• kinetic theory 
• matter matters
• temperature