Heating Curves and Phase Diagrams

What line segment represents only the solid state?

• A-B
• B-C
• C-D
• D-E

Between which points is the temperature of the substance remaining constant?

• A-B only. 
• A-B, C-D, E-F
• B-C only. 
• B-C, D-E

Between which points is the temperature of the substance increasing?

• A-B only. 
• A-B, C-D, E-F
• B-C only. 
• B-C, 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

The melting point of the sample is

• -60 ºC

• -100 ºC

• 60 ºC

• 100 ºC

In which region(s) of the graph does a phase change occur?

• Region 1, 3, & 5
• Region 2 & 4
• Region 1 only
• Region 1 & 2

At higher temperatures

• particles in an object have less energy
• particles in an object move faster
• a gas contracts

What state of matter is X?

• solid 
• liquid
• gas
• supercritical fluid

What state of matter is Y?

• solid 
• liquid
• gas
• supercritical fluid