Heating and cooling curves

What line segment represents only the solid state?

• A-B
• B-C
• C-D
• D-E

Which segment represents the heat of fusion?

• A-B
• B-C
• C-D
• D-E

What state(s) of matter are present at D-E?

• Solid-liquid
• Liquid
• Liquid-gas
• Gas-Solid

Between which points is the substance changing state?

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

In which segment is the kinetic energy remaining constant?

• A-B
• B-C
• C-D
• E-F

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

• 100 C
• 60 C
• 80 C
• 20 C

The graph shows a cooling curve for an unknown substance.  What is happening during segment DE?

• boiling
• condensation
• freezing
• melting

In which region(s) of the graph would the substance be melting?

• No melting occurs on this graph

• Region C-E

• Region E-G

• Region G-I

• Region I-K

What is the freezing point of the substance?

• 0^oC

• 60^oC

• 120^oC

• 180^oC